installation instructions - KJG

UNI 1 and UNI 2 Metal Roofing
Technical Installation Guide
K&J&G a.s., Čachtice, Slovak Republic

CONTENTS
1. MATERIAL AND SURFACE FINISH
1.1. Coloured surface finishes for zinc coated sheet metal
1.2. Coloured surface finishes for aluminium sheet metal
1.3. Purpose and use
2. TYPE AND INTENDED USE OF UNI 1 AND UNI 2 ROOFING
2.1. UNI 1 roofing
2.2. UNI 2 roofing
2.3. Accessories
2.4. Detailed product description
3. TRANSPORT, STORAGE AND HANDLING
3.1. Transport and storage
3.2. Handling
4. DESIGN PARAMETERS FOR ROOF SUPPORTING STRUCTURES
4.1. Lath parameters
4.2. Lath installation under the roofing material
4.2.1. With drip edge flashing
4.2.2. Without drip edge flashing
4.3. Roof underlayment - waterproofing, design and installation
4.4. Lengths of individual roofing sheets.
4.4.1. Defining proper lengths including overlapping
5. INSTALLATION OF INDIVIDUAL COMPONENTS
5.1. Initial installation conditions - roof inspection
5.2. Fascia board and edge flashing - installation
5.2.1. Full peak end cap above the edge flashing
5.2.2. Peak under the edge flashing
5.3. Roofing material installation
5.4. Roofing sheet installation
5.5. Screws for installing UNI 1 roofing and accessories
5.6. Custom cutting roofing materials
5.7. Walking on installed sheets
5.8. Snow barriers - use
5.9. Peak - use and installation
5.10. Valley flashing
5.11. Penetration bushings
5.12. Roof-mounted windows
5.13. Transposing roof slopes

TECHNICAL DATA FOR UNI 1 AND UNI 2 LIGHT ROOFING
1. MATERIAL AND SURFACE FINISH
1.1. Zinc coated sheet metal with Myrialac and Myriamatt-T:
Steel sheet metal hot dipped zinc coated pursuant to the STN EN 10169-1 standard
(Continuously organic coated (coil coated) steel flat products. Section 1: General information
(definitions, materials, tolerances, test methods)), thickness 0.50mm, pursuant to STN EN 10327
(Continuously hot-dip coated strip and sheet of low carbon steels for cold forming. Technical delivery
regulations), quality DX51D +Z200, delivered pursuant to STN EN 10142 (Continuously hot-dip
zinc coated low carbon steels strip and sheet for cold forming. Technical delivery regulations) with
organic polyester surface finish, thickness: SP 25µm, or matte polyester, thickness: SP 35µm on
the face side and thickness: SP 7µm on the back side. The sheet metal is delivered pursuant to STN
EN 10204 (Metallic products. Types of inspection documents).
A detailed description of the raw sheet metal used to produce the roofing material is provided at:
Material sheets for MYRIAD-Myrialac, Myriamatt-T
Basic GLOSS and MATTE colour shades, 0.5 mm thick.
TM-Terra brown OČ-Oxide red MH-Copper brown MŠ-Anthracite grey
RAL 8028 RAL 3009 RAL 8004 RAL 7016
Basic GLOSS colour shades, 0.5 mm thick.
TH-Chocolate brown HČ–Brown red IČ- Jet black BH-Aluminium white B-White ŠB-Grey white
RAL 8017 RAL 3011 RAL 9005 RAL 9006 RAL 9010 RAL 9002
Custom GLOSS colour shades, 0.55 mm thick.
MZ-Moss green PŠ-Dusty grey MOT- Gentian blue MM-Metallic copper
RAL 6005 RAL 7037 RAL 5010 extra RAL

1.2. Surface finish on coloured Novelis aluminium sheet metal:
Aluminium sheet metal, thickness 0.68mm, material EN-AW 3105 pursuant to EN 573/3:2008
(Aluminium and aluminium alloys. Chemical composition and form of wrought products. Section 3:
Chemical composition.), delivered pursuant to STN EN with organic polyester surface finish,
thickness: 20 m on the face side and polyurethane, thickness: 4 m on the back side.
A detailed description of the raw sheet metal used to produce the roofing material is provided at:
Material sheets for NOVELIS
Basic GLOSS and MATTE colour shades, 0.68mm thick.
TM-Terra brown OČ-Oxide red MH-Copper brown MŠ-Anthracite grey
RAL 8028 RAL 3009 RAL 8004 RAL 7016
1.3. Purpose and use
UNI 1 and UNI 2 metal roofing is designed as lightweight roofing material for roofs with a minimum
slope of 14° with lengthwise joints or for roofs with a minimum slope of 12° without lengthwise
joints with lath spacing of 350 mm or 400 mm depending on the type of modules used. Minimum
lengths are 475 mm (for 350 modules) and 525 mm (for 400 modules). The maximum length is
6500 mm (for both 350 and 400 modules). The product can only be used when a structural
assessment of the load bearing structure has been completed for the expected load. Product service
life depends on the environment of installation and the surface finish. The stipulated service life can
be achieved when used as designed and when treated with an appropriate surface finish. UNI 1 and
UNI 2 metal roofing is manufactured by cold forming steel or aluminium sheet metal into a wavy
shape with lengthwise ridges.

2. TYPE AND INTENDED USE OF UNI 1 AND UNI 2 ROOFING
2.1. UNI 1 roofing
MODULE 350 400
Total width 1195 mm 1195 mm
Structural - covering width 1105 mm 1105 mm
Ridge height 23 mm 23 mm
Offset height 15 mm, 20 mm 20 mm
Overall height 38 mm, 43 mm 43 mm
Minimum length 475 mm 525 mm
Maximum length * 6500 mm 6500 mm
Lath spacing ** 350 mm 400 mm
Minimum possible slope *** 14° 14°
Weight for zinc-coated sheet metal Around 5 kg/m 2 Around 5 kg/m 2
Weight for aluminium sheet metal Around 2.4 kg/m 2 Around 2.4 kg/m 2
* Roofing sheet lengths can be custom ordered to measure (roofing with extended lengths can be produced
after prior agreement)
** See supporting lath methods
*** Min. slope of 14° for lengthwise joints; if the roof has no lengthwise joints, the minimum slope is 12°

2.2. UNI 2 roofing
MODULE 350 400
Total width 1189 mm 1189 mm
Structural - covering width 1100 mm 1100 mm
Ridge height 24.5mm 24.5mm
Offset height 15mm, 20mm 20mm
Overall height 39.5mm, 44.5mm 44.5mm
Minimum length 480 mm 530 mm
Maximum length * 6500 mm 6500 mm
Lath spacing ** 350 mm 400 mm
Minimum possible slope *** 14° 14°
Weight for zinc-coated sheet metal Around 5 kg/m 2 Around 5 kg/m 2
Weight for aluminium sheet metal Around 2.4 kg/m 2 Around 2.4 kg/m 2
* Roofing sheet lengths can be custom ordered to measure (roofing with extended lengths can be produced
after prior agreement)
** See supporting lath methods
*** Min. slope of 14° for lengthwise joints; if the roof has no lengthwise joints, the minimum slope is 12°

2.3. Accessories.
Accessories for metal roofing sheets (rounded peaks, ventilation peaks, rounded peak end caps, full
profile peak end caps, snow guard sets, corner flashing, simple flashing, valley flashing, etc.) are
produced from the same steel or aluminium sheet metal as the actual roofing material. Accessories
for the roofing system include a complete assortment of accessories that meet the most demanding
quality, colour and functionality requirements to ensure the entire roof system works properly.
Rounded peak, effective width
312mm
Peak vent
Peak end cap - rounded
Self-tapping roofing screws Snow guards 2m (set) Snow retainer
Peak end cap - full Diffusion foil 110g, 130g, 140g UNI roof hatches
UNI 50x60 a 60x60
Drip edge seal - lower Peak seal - upper Universal sealing strip 60mm

MF penetration bushings Ventilation grate 1000/50 Framing protective strip
100x5000mm
Edge flashing - upper Valley flashing Leeward flashing
Edge flashing - lower Edge flashing - flat roof Drip edge flashing
Colour correction spray Magnetic bit 8mm Peak lath holder
Lightning rod system
accessories
Lightning rod system
Stainless peak wire
Lightning rod system
Stainless wire support
Lightning rod system
Stainless wire clip
Lightning rod system
Stainless wire support for standing
seam roof
Lightning rod system, Stainless
wire support for brick

Lightning rod system
Conductor strip, 30x4,
Lightning rod system
AlMgSi wire f8mm 25kg
(1kg/7.1m)
Electric shears
2.4. Detailed Product Description
UNI 1 and UNI 2 roofing sheets with accessories - Shapes and Dimensions
Marking
of product
Profile shape
UNI 1 Metal Roofing
Thickness Coverag
e
width
Part
lengt
h
Weight
of the
material
mm mm mm kg/m 2
UNI 1
23-1105
15-350
15 offset
height
zinc
0.5
aluminiu
m
0.68
1105 min.
475
max.
6500
zinc
4.6
aluminiu
m
2.19
UNI 1
23-1105
20-350
20 offset
height
zinc
0.5
aluminiu
m
0.68
1105 475
to
6500
zinc
4.61
aluminiu
m
2.2
UNI 1
23-1105
20-400
zinc
0.5
aluminiu
m
0.68
1105 525
to
6500
zinc
4.61
aluminiu
m
2.2

UNI 2
24.5-1100
15-350
20-350
20-400
zinc
0.5
0.55
aluminiu
m
0.68
1100 min.
480
max.
6500
zinc
4.9
5.4
aluminiu
m
2.19
UNI 2
24.5-1100
15-350
20-350
zinc
0.5
0.55
aluminiu
m
0.68
1100 480
to
6500
zinc
4.9
5.4
UNI 2
24.5-1100
20-400
Accessories for metal roofing
Marking
of product
Profile shape
Rounded
peak
Peak
end cap -
full
Effective width 312 mm
zinc
0.5
0.55
aluminiu
m
0.68
1100 530
to
6500
zinc
4.9
5.4
Thickness Coverag
e
width
Part
lengt
h
Weight
of the
material
mm mm mm kg/m
zinc
0.5
aluminiu
m
0.68
zinc
0.5
aluminiu
m
0.68
1920
2820
4020
1920
2820
4020
zinc
2.35
3.45
4.92
aluminiu
m
1.12
1.64
2.34

Peak
end cap -
rounded
zinc
0.5
aluminiu
m
0.68
Peak
vent
zinc
0.5
aluminiu
m
0.68
Snow
guard
set:
strip
reinforceme
nt
underlay
screws
zinc
reinforceme
nt
1.5
strip
0.5
underlay
3
screws
4.8x60
4.8x35

Snow
retainer
Zinc
0.55
3. TRANSPORT, STORAGE AND HANDLING
3.1. Transport and storage
Roofing sheets and accessories are transported using enclosed vehicles and trailers. Every package
is marked in a visible location with instructions for transport, storage and handling. UNI 1 sheets are
delivered on disposable wooden pallets constructed to provide maximum possible protection for the
roofing material. The roofing material is placed on the pallet so the longest parts are on the bottom
and the shortest are on top. Their exact length and use can be identified from the storage plan,
which is included with delivery. The entire pallet and all roofing material are wrapped with a
protective foil for safety reasons and to protect the materials from damage during transport. Upon
request, we can also deliver roofing materials to the customer with protective foil applied to each
piece individually. Pallet unloading at the customer's site will use a boom arm attached directly to
the transporting vehicle. Flexible rigging equipment must be used during the unloading process. If
the pallet will be stored for an extended period of time, the proper storage conditions must be
followed. Store the pallet in a dry and ventilated area that does not experience large temperature or
fluctuation variances. The ideal storage site for the product is in a dry and ventilated space under
cover that is not exposed to sunlight or under a waterproof tarpaulin and frame structure. This
sheltered structure must be large enough to allow for air to flow between the tarpaulin and the
packaged product. Do not store the roofing material near aggressive chemicals or materials. If the
protective foil is damaged, repair the affected area using new foil in order to prevent moisture and
contaminants from entering into the space (moisture condensing in the packaging may cause
staining). Pallets must be stored flat. Outdoor storage is capped at 1 month (if the protective foil is
not exposed to direct sunlight and the roofing material must be protected against rain). Indoor
storage is capped at 2 months and laths must be installed between the individual pieces in order to
prevent permanent deformation and to ensure sufficient air circulation (we recommend avoiding
long-term storage thanks to our short delivery times). The roofing material can be stored in a
slanted position in order to better drain any condensate that may form. The individual conditions are
shown in the figures.

3.2. Handling
Only carry the roofing material in a flat position and hold the material at the site of lengthwise
ridges, where the material is reinforced. When moving the roofing material up onto the roof
structure, we recommend moving the material using panels on which the individual pieces of the
roof can be pulled. Avoid any lengthwise bending and creasing of the roofing material at all times
during any handling work. Such deformations cannot be removed and cause the installation to take
on an unappealing look. Do not pull individual pieces of material on top of one another (may cause
scratching); always lift each piece individually)(see the figure and description)
Lift larger pieces from the ground up to the roof work
surface as follows: A minimum of two panels can be
supported against the roof structure. The ideal panel slope
angle is the same as the roof surface slope angle. A surface
protection layer (i.e. foil or fabric) can be applied at the
contact surface between panels and the roofing material to
lower the risk of damage to the lower side of the roofing
material. The panels can also be replaced by using a
ladder. Once such an angled plane has been created, you
can safely pull the roofing material onto the roof surface.
Do not stand beneath roofing materials when they are
being lifted!
Never pull roofing material along other roofing material when removing
individual sheets from the pallet. Always remove products from their
packaging by lifting and not sliding them in order to prevent damage to the
protective coating. Any sharp edges created after trimming the edges of the
roofing material can cause damage to the painted surface. At least two
workers are required to remove small (under 2 m) roofing materials from
pallets. At least four workers are required when removing larger pieces.
Proper grip and roofing material handling are explained in the figure. The
proper place to grip the material during handling is at a lengthwise or
vertical ridge where the material is reinforced and will not fold and cause
permanent deformation.

Removing the protective foil
Handling larger pieces (at least 4 workers) Handling smaller pieces (up to 2m)
4. DESIGN PARAMETERS FOR ROOF SUPPORTING STRUCTURES
4.1. Lath parameters
The use of UNI 1 roofing materials does not require full cladding for the roof surface. The roof
structure can be designed in a number of ways. UNI 1 roofing materials have a relatively low weight,
around 5 kg/m 2 , which means that its weight is relatively inconsequential with respect to roof
loading. The following are decisive when designing the structure and sizing lath cross-sections:
A. The snow area in which the project is located, STN EN 1991-1-3 (previously STN 73 0035)
B. Roof slope
C. Axial spacing of the roof rafters
Table showing the standard snow loads in individual areas pursuant to the STN EN 1991-1-3 standard.

Snow Zone
Snow
density
I II III IV V
s k – characteristic
property of snow on the
ground (kN/m 2 )
Reference calculation to
snow weight (kg/m 2 )*
0.75 1.05 1.5 2.25 >2.5
75 105 150 225 >250
Fresh 100 kg/m 3 75 cm 105 cm 150 cm 225 cm >250 cm
Reference
calculation Settled (a few hours to days
200 kg/m 3 37.5 cm 53 cm 75 cm 112.5 cm 125 cm
after snow fall)
to snow
layer
Old (a few weeks to months
300 kg/m 3 25 cm 35 cm 50 cm 75 cm 83 cm
after snow fall)
(cm)*
Wet 400 kg/m 3 19 cm 26 cm 37.5 cm 56 cm 62.5 cm
* Reference calculation for characteristic value of snow S k
The following conditions can be used to simplify the design process:
a. Snow load: Group A: I. II. and III. snow zones
Group B: IV. and V. snow zones (mountain and foothill areas)
b. The axial spacing of rafters in family houses is from 900 mm to 1100 mm
c. The inherent weight of the roofing material has no impact on the structural design (around
5kg/m 2 )
These details all lead to simplified rules for determining lath dimensions:
a. Roofing laths 50x40mm for the snow zones in Group A and for roof slopes over 20° and rafter
spacing of up to 900mm
b. Roofing laths 60x40mm for the snow zones in Group B and for roof slopes under 20° and rafter
spacing of up to 1100mm
These simplified rules do not replace a professional calculation and sizing of the roof structure and
its individual components by a certified designer. The actual design process is complex and affected
by a number of factors, which is the reason why this operation should be left to a design
professional for this area. The simplified version is simply provided to give a representative
example.
Map of snow load characteristics on the ground s k for snow zones I to V in Slovakia (source: STN EN
1991-1-3/NA).
4.2. Lath installation under the roofing material

4.2.1. Lath spacing when using drip edge flashing. 4.2.2. Lath spacing without using drip edge flashing.
All roofing laths are secured in the same manner. The top of the first roofing lath must be perpendicular to the top
plate lath installed on the rafter.
4.2.1. With drip edge flashing
Spacing of 350 mm for roof laths is the same as for all
other roof laths when using 350 roofing modules; the
roofing material is not inserted into the gutter. The final
roof lath near the peak is around 50 mm from the peak
itself. Before securing the roofing material, the drip
edge flashing is first installed on the first roof lath; this
flashing is inserted at least 1/3 of the width of the
gutter. The roofing material is then secured to the roof
lath using roofing screws in the lower part of the ridge
under the offset. A lower drip edge seal should be
installed between the drip edge flashing and the roofing
material.
(Roof lath spacing is 400 mm for 400 roofing modules)
4.2.2. Without drip edge flashing
Spacing of 350 mm for roof laths is the same for all
other roof laths when using 350 roofing modules except
for the first gap, which is 280 mm and the roofing
material is inserted at least 1/3 of the width of the
gutter. The first gap must be adjusted if the roofing
material will be inserted into the gutter in any other
manner. The first roof lath is secured with the top side
perpendicular to the top plate lath installed on the rafter
(15 or 20 mm higher depending on sheet thickness).
The final roof lath near the peak is around 50 mm from
the peak itself. The roofing material is secured to the
roof lath using roofing screws in the lower part of the
ridge under the offset into the first lath in the lower
section of the ridge.
(Roof lath spacing is 400 mm for 400 roofing modules
with the gap for the first roof lath set to 320 mm)
4.3. Roof underlayment - waterproofing, design and installation
The proper selection, use and installation of roof underlayment is critical to ensure 100%
functionality of a roof. A high efficiency diffusion barrier is used with insulated roofing material. Roof
underlayment is applied directly onto the roof structure. Begin parallel to the drip edge and then
move from the drip edge to the tops of the rafters. Underlayment overlap near the drip edge and
the peak must be at least 200 mm past the level of the wall. Temporarily fix the underlayment using

staples to the rafters. Permanently secure the underlayment by nailing it to the top plate lath (the
gap ensures that the roof is ventilated) from the upper edge of the underlayment in the direction of
the rafters. Leave the underlayment slightly loose between the rafters (with a maximum of 40 mm
of play in the middle of the gap between rafters). Complete underlayment installation at the roof
peak following the installation guide provided for individual specific details. At horizontal joints the
underlayment must overlap by around 150 mm. If the underlayment needs to be adjusted in a
lengthwise direction, do so at a rafter and ensure that the overlap is at least 100 mm. Tape the
underlayment together using double-sided tape recommended by the underlayment producer for
roofs with slopes under 14°.
The roofing material cannot come into direct contact with wet or fresh cut lumber, wet concrete or
with copper or water leaking from copper materials on the roofing material itself. The roofing
material should not be exposed to vapours that cause corrosion, ash or cement dust. Organic debris
(leaves and branches, etc.) must be removed from the surface. When connecting roofing with
different surface finishes, first consider the possibility of contact corrosion between the roofing
materials. The method and conditions of use must be consulted with the manufacturer in the event
the roofing material will be used for any purpose other than its intended purpose.
4.4. Lengths of individual roofing sheets.
The coefficient of thermal expansion for zinc coated sheet metal is 3.97mm/m/100°C. During the
summer months the metal may approach temperatures of around 80°C. The maximum length of a
single piece of roofing material due to such thermal expansion is recommended to be 6500 mm or
less. Given ease of handling concerns, we recommend using lengths of individual pieces of no more
than 4000 mm. A common situation is where two sheets have to be connected to one another. The
overlap between the two pieces must be at least 140 mm (for both 350 and 400 roof modules). The
length of such overlap must be calculated when measuring and ordering roofing materials and
determining the proper length.
4.4.1. Defining proper lengths including overlapping
If the total length A (from the top centre of the peak to
the drip edge) is larger than 6500 mm then two roofing
sheets must be used. The overlap, defined as D, is at least
140 mm. Follow the instructions below to define the
length C of the upper piece: Divide the total length A in
half. Use the actual, real dimension from the critical
length table for such an approximation of the length B of
the lower piece. Here it is important to also consider the
given roofing module (350 or 400). Now you have a
defined value for length B of the lower part. From the
total length A, subtract the length B of the lower piece but
don't forget to add the overlap D. The result is the length
C of the upper piece, which should be checked against the
critical length table. To check: B+C-D=A (which is the
total length)

5. INSTALLATION OF INDIVIDUAL COMPONENTS
5.1. Initial installation conditions - roof inspection
UNI 1 roofing material can be used on roofs
with a slope of at least 14°. This condition
must be respected, otherwise our warranty is
null and void. Be sure to measure and check
all dimensions of the roof framing structure
before beginning the installation of the
roofing material. Roof corners and edges (the
drip edge to side and peak to side) must all
be right angles (90°) and the drip edge must
be parallel to the peak. All measurements
must be checked at multiple places. We can
check for squareness using simple measurements of the diagonals from the corners. The following
conditions must apply: distance A = distance B (see the figure above). Small deviations of up to 2
cm can be resolved by adjusting the laths and flashing before the roofing material is installed.
Larger dimensional issues must be resolved as they may cause irregularities in the edges of the roof
and may lead to a shift in the ridge pattern in the roofing material during installation. The flatness of
the roof laths is also important to ensure that the fasteners do not create a wavy pattern on the
roofing surface, symptoms of which primarily include a lack of reliability in overlapping joints.
5.2. Fascia board and edge flashing - installation
The edge of the fascia board must be installed in a position above the laths before the roofing
material is installed; the gap must equal the height of the roofing material itself. The fascia board
extends over the laths by around 45 mm for UNI 1 (the exact height of the roofing material itself).
Edge flashing is installed from the drip edge up to the peak. The final piece of the edge flashing
must be cut to the proper length at the peak. Edge flashing overlap is at least 100 mm. Edge
flashing must overlap the first vertical ridge in the roofing sheet. Edge flashing is composed of two
sections. Secure the lower part of the edge flashing, the lower flashing, to the fascia board before
installing the roofing material on the laths. Secure the flashing to the fascia board and then to the
laths (using nails and clips). Once the roofing material has been installed, properly position the
upper part of the edge flashing. Secure this part with 4.8 x 35 screws to the fascia board (400 mm
spacing) and 4.8 x 20 screws to the vertical ridge of the sheet (around 1 m spacing). One of the
following methods is used for terminating the edge flashing at the peak.

5.2.1. Full peak end cap above the edge flashing
Once the roofing material has been installed, properly position the upper part of the edge flashing.
Secure this part with 4.8 x 35 screws to the fascia board (400 mm spacing) and 4.8 x 20 screws to
the vertical ridge in the roofing material (around 1 m spacing). Secure the full peak end cap with 4.8
x 20 screws to the peak and then secure it and the peak itself to the upper section of the roofing
material with 4.8 x 20 screws with spacing of around 300 mm.
5.2.2. Peak under the edge flashing
After the roofing material has been installed, secure the peak using 4.8 x 20 screws to the upper
section of the profile on the roofing material with spacing of around 300 mm. This case does not
require the use of a full peak end cap. The upper section of the edge flashing is then secured to the
fascia board. Secure this part with 4.8 x 35 screws to the fascia board (400 mm spacing) and 4.8 x
20 screws to the vertical ridge in the roofing material (around 1 m spacing).
5.3. Roofing material installation
Roofing material installation uses a laying plan, which is always included in delivery. All roofing
accessories must first be installed before the roofing material itself, i.e. drip edges, drip edge ends,
valley flashing and fascia boards. The roofing layer can be laid using two basic methods:
A. Roofing installation from left to right B. Roofing installation from right to left
When laying roofing sheets from left to right, we always lay the next sheet beneath the raised edge
of the previous sheet of roofing material. The underlay roofing material is tightly secured in this
manner without fasteners by the upper sheet, which simplifies and makes the resulting joints more
reliable. This installation method is suited to roofs with steeper slopes and when using longer length

oofing materials. The sheet is placed on the previous sheet with laying the roofing materials from
right to left. The decision regarding one or the other method depends on a number of factors
including the shape of the roof surface (windows, dormers, sharp angle cuts, chimneys, etc.), the
type of roof, prevailing wind direction, roof slope and the length of the individual roofing materials.
The installation method should be chosen by a professional who will then complete the installation
itself. In both cases it is critical to follow a simple rule: the drainage groove (on the left-hand side of
the roofing material) on the lower sheet must always be covered by the top sheet and cannot be
broken or disturbed at any spot with a fastener screw (loss of groove integrity).
5.4. Roofing sheet installation
Once a decision has been made on the installation
method (from left to right or vice versa), place the
first sheet on the side where you will start. The
sheet must be properly positioned over the drip
edge (at least 40 mm) so that it extends over 1/3
the width of the gutter. Level out the roofing sheet
with the drip edge on the roof and install one 4.8 x
35 screw near the drip edge into the lath on the
roofing frame and temporarily near the upper edge
of the sheet towards the peak (Fig. 1). Position the
second sheet on the first sheet so that the drainage
groove is covered and that the profiles line up at the
edges of the sheets in a break along the horizontal
ridges in the sheets. The lower drip edge of the
sheets must create a straight line. Then use 4.8 x
20 self-drilling screws to secure both sheets along
the entire overlap below the offset in the upper
section of the sheet (Fig. 2). Use the same method
to connect three to four sheets while securing each
of the individual sheets to the lath with a single
screw in the upper corner towards the peak. Ensure
the drip edge along the entire lower portion of the
roof is straight. Leave the sheet secured with a
single screw in one of the corners and then move up
and down (Fig. 3) until the desired alignment of the
lower section of the joined sheets with the drip edge
of the roof is achieved. If needed, the initial screw
can be removed from the lath and reinstalled at
another location in order to make this alignment
perfect. Once the proper position has been
achieved, use an appropriate quantity of 4.8 x 35
screws to secure the individual sheets to the lath
structure (Fig. 4). Now the drip edge is straight and
you can install additional sheets. Every installed
sheet must be secured to the previous sheet at the
overlap using 4.8 x 20 mm screws in the upper
ridge below each lengthwise offset and then to the
lath structure using 4.8 x 35 mm screws in the
lower flat section of the sheet. It is critical that
every sheet be properly positioned during the laying
process and be free of any deformations or
curvature. Every sheet must be installed
perpendicular to the drip edge.
Anchoring screws on the roofing material must be
spaced as shown in the figures. 4.8 x 35 screws are
used in every ridge of the sheet on the lower and
upper sides and the edges of the panels; the screws
are installed to the laths in the lower flat section.
In even rows, starting with the second from the
bottom, 4.8 x 35 screws are installed in every
second ridge of the sheet; the screws are installed
to the laths in the lower flat section.

4.8 x 20 screws connect the sheets at overlapping sheets along the vertical ridge about 1 cm below
every lengthwise offset in the side section of the sheet.
Total screw consumption is around 8 per m 2 . The peak is secured using 4.8x20 screws installed into
every second peak of the ridge structure.
4.8 x 35 screws are used to anchor the sheets to the lath structure at around 1 cm below the
lengthwise offset in the lower section of the sheet.
The overlapping sheet joints are secured using self-drilling 4.8 x 30 screws installed around 1 cm
below every lengthwise offset in the side section of the sheet. Attention! Screws cannot interrupt or
interfere with the drainage groove!
5.5. Screws for installing UNI 1 and accessories
Self-drilling screws made from high quality steel are
used to install UNI 1 roofing materials. The screws are
delivered with the same surface finish as the roofing
material. The screws include washers, which also feature
an EPDM gasket material on the bottom. EPDM -
(ethylene propylene diene M-class) is a synthetic polymer
with exceptional physical and mechanical properties
including resistance to atmospheric conditions and a
number of chemicals. The washer and gasket ensure
that the connection is 100% waterproof. We use 3 types
of screws during installation:
1. 4.8 x 20 screws are used to connect roofing sheets and accessories (metal on metal joints). The
screw is positioned in the upper ridge beneath the offset in the sheet overlap (also used to secure
the end cap and side flashing to the metal roofing).
2. 4.8 x 35 screws are used to anchor the metal sheets to the lath structure (wood to metal
joints). The screw is anchored in the lower flat section of the sheet's ridge as close to the lengthwise
offset as possible.
3. 4.8 x 60 screws are used to secure the snow barriers to the roof structure (wood to metal
joints). These screws are installed in the lower cleats of the snow barriers and are secured to laths.
The full functionality and the service life of both joints and screws can only be achieved by using the
recommended installation tools. An electric driver with adjustable torque should be used to install
the screws. The required quantity and type of screws is defined on the basis of documentation
completed for each project individually. Reference fastener
consumption is around 8 per m 2 .
Proper torque adjustment for anchoring screws
A - Properly set torque (even base, compressed gasket - slightly
rounded around the circumference)

B - Excessive torque (EPDM gasket is deformed, may crack and lose the ability to make a seal)
C – Low torque (washer with EPDM gasket has insufficient sealing ability)
A B C
5.6. Custom cutting roofing materials
If angled edges need to be corrected or if the straight
edges of the roofing material are too long, please
follow these instructions: If possible, cut all edges on
the ground or on a hard surface. Manual tin snips or
electric shears are used to cut the sheet metal. An
angle grinder with a cut off wheel can never be used
to cut the metal sheets. The resulting edge has been
exposed to heat, which destroys the protective coating
and significantly reduces service life. The shards and
tearing cause corrosion to appear more quickly. The
use of an angle grinder immediately voids any
warranty. The use of an angle grinder with a cut off
wheel is forbidden! If a sheet must be cut on the roof,
remove any shavings or shards that are created when
making the cut (subsequent oxidation may cause
corrosion and colour changes and decrease the service
life of the roof or cause fastener problems if they get
into joints). Use the correction pen to touch up the
paint that has been damaged at the cutting sites.
Clean the damaged surfaces using a petroleum-based
solvent and then treat with the appropriate shade of
paint (correction pen or paint). Do not use any
nitrogen or chlorinated rubber solvents! During
installation, it's critical to treat all cut edges, including those edges that were cut during the roofing
material production process.
5.7. Walking on installed sheets
Installation is conducted so that no one walks over the roofing materials. If this is not possible, the
roofing materials can be walked on with soft-soled shoes but you must walk on the lower section of
the ridge where laths are installed (there is no risk of deforming the sheet in these spots). Before
walking on the metal roofing, check to ensure your shoe soles are clean (that there is no metal, dirt,

wood, sand or other abrasives that may damage the sheet surfaces). If needed to distribute the
load, additional supports can be used (allows for the distribution of the load over a larger area,
thereby decreasing the real area on which the load is applied).
5.8. Snow protection - application
Snow retainers are installed:
- Where snow falling from the roof can pose a hazard to pedestrians or damage other structures.
- Where snow collects due to movement on the roof (e.g. in valleys)
- Where moving snow could damage the roof structure or roofing sheets.
- Snow retainers are used to hold snow on the roof, which acts as additional insulation.
We deliver two forms of snow protection: K&J&G snow retainers for UNI 1 and UNI 2 roofing
(designed for use in areas with low and moderate snow loads, see snow zones I, II and III in the
map of snow zones in Slovakia) and snow guards (for snow zones IV and V). The required number
of snow retainers depends on the slope of the roof and the quantity of precipitation in the given
area.
Snow retainer
retainers in a number of consecutive rows.
Snow barrier
Pursuant to STN 1991-2-3:
The forces acting on a retainer are defined as follows:
F s = s x b x sinα s = µ i x s k
Legend:
F s - Snow load on the retainer in the direction of shear
(kN/m)
s – Snow load on the roof (kN/m 2 )
b – Distance from barrier to the peak or from the
previous row of snow retainers (m)
α - Roof slope (°)
µ i - Shape coefficient (0.8 - 1.6)
s k - Snow load based on snow zone (kN/m 2 )
The calculation is defined for static loading. The
dynamic force induced by the movement of the snow
is not considered in this calculation and is much
higher than the static load. In order to define this
component, it would be appropriate to install the snow
The placement and use of snow retainers can also be determined based on experience in the given
site of installation. If installation is taking place in an area where no such information exists, they
can be installed by observing similar installations on buildings in the area that appear functional. A
designer can also calculate these loads if all the roof details are included in the project.
5.8.1. Installation of snow retainers
The installation of K&J&G snow retainers is clear from the
figure. One retainer is comprised of the retainer body itself
in the same colour as the roof and 3x25x80 anchoring
screws and EPDM washers. A snow retainer is anchored to
the roofing panels using two 4.8 x 60 screws and into the
roofing sheet using two 4.8 x 35 screws. An EPDM gasket is
inserted between the lower part of the snow retainer and
the roofing material to ensure the joint is sealed. The
quantity of snow retainers and their installation locations on

the roof itself are defined on the basis of a calculation (depending on the type of roof and the snow
zone). The procedure is shown below. This type of protection is suitable for snow zones I., II. and
III. (see the table with snow zones in the Slovak Republic). Such protection is inadequate for zones
IV. and V.
Fig. 1
Snow barrier installation is clear from the figure. The
barrier comprises the actual barrier component, which is 2
m long and in the same colour as the roofing, an "L"
reinforcement bracket that is 2 m long, anchoring screws
and EPDM washers. A snow barrier is anchored to the
roofing panels using two 4.8 x 60 screws and into the
roofing sheet using two 4.8 x 35 screws. An EPDM gasket is
inserted between the reinforcing bracket and the roofing
material to ensure the joint is sealed. The quantity of snow
barriers and their installation locations on the roof itself are
defined on the basis of a calculation (depending on the type
of roof and the snow zone). The procedure is shown below.
This type of protection is primarily recommended for snow
zones IV. and V. (see the table with snow zones in the
Slovak Republic). It can also be used for snow zones I., II. and III.
Fig. 2
We recommend using snow barriers in areas with large
snowfall totals (see the map of snow zones). Construction
standards also require the use of snow barriers and they
can be used to protect gutter systems from deformation
when snow moves and to protect people. Snow barriers
should be positioned on the roof surface in critical areas
where the movement of snow could cause damage to roof
components or pose a risk of falling snow for people and
items below the roof (roof-mounted windows, entrances to
the building, parking lots, walkways, etc.). A snow barrier
can be installed in a single row or in multiple overlapping
rows. The use and design of snow barriers must be
consulted with professionals at our sales outlets. Snow
barrier installation is clear from the figures. A barrier is comprised of the snow barrier itself in the
same colour as the roof, reinforcement, anchoring screws and EPDM washers. A snow barrier is
anchored to the roofing panels using 4.8 x 60 screws and into the roofing sheet using 4.8 x 35
screws. An EPDM gasket is inserted between the lower part of the snow barrier (reinforcement) and
the roofing material to ensure the joint is sealed.
5.8.2. Defining the type of snow protection, placement and minimum quantity on the roof
surface:
A B C D E
5.8.2.1. Angled roof, slope from 14° to 45° with rafter length of up to 5m.
For snow zones I. and II. (see the snow zone map of Slovakia), the installation method is even in
two consecutive rows (the first two rows from the drip edge) alternating over every fourth lower
ridge in the sheet for each row with a two ridge offset between the rows (see Fig. A and Fig.1).

For snow zone III. (see the snow zone map of Slovakia), the installation methods is the same with
an increased number of retainers per standard meter in two consecutive rows (the first two rows
from the drip edge) alternating over every second lower ridge. (see Fig. B and Fig. 1).
For roofs in snow zones IV. and V. (see the snow zone map of Slovakia), other protection using
snow barriers is recommended. Here the coverage width is 2 m and anchored to every upper ridge
on the sheet (from the upper edge of the snow barrier to the roofing lath using a reinforcing
bracket) in the area above the first lengthwise offset above the drip edge. (see Fig. E and Fig. 2).
5.8.2.2. Angled roof, slope from 14° to 45° with rafter length of up to 7m.
For snow zones I. and II. (see the snow zone map of Slovakia), the installation method is even in
two consecutive rows (the first two rows from the drip edge) alternating over every fourth lower
ridge and two more rows (in the middle of the rafter's span) alternating over every fourth lower
ridge. There are a total of 4 rows with twice the number of retainers (see Fig. C and Fig. 1).
For snow zone III. (see the snow zone map of Slovakia), the installation method is even in two
consecutive rows (the first two rows from the drip edge) with more retainers per standard metre
alternating over every second lower ridge and two more rows (in the middle of the rafter's span)
alternating over every fourth lower ridge. There are a total of 4 rows with twice the number of
retainers (see Fig. D and Fig. 1).
For roofs in snow zones IV. and V. (see the snow zone map of Slovakia), other protection using
snow barriers is recommended. Here the coverage width is 2 m and anchored to every ridge peak on
the sheet (from the upper edge of the snow barrier to the roofing lath using a reinforcing bracket) in
the area above the first lengthwise offset above the drip edge. (see Fig. E and Fig. 2).
Warning!
Snow zones IV. and V. (see the snow zone map of Slovakia) are considered to be the extreme zones. In such case the design
of snow barriers and retainers is subject to an individual assessment based on the customer's request. The type, quantity
and placement of snow retainers are defined by the Technical Department at K&J&G on the basis of a specific order.
5.8.3. Defining the number of snow retainers
The length of the edge near the drip edge (in metres) is multiplied by the given coefficient (number
per standard metre) for the given type of roofing material and the snow zone.
Rafter length Up to 5m Up to 7m
Snow Zone I II III IV V I II III IV V
Units per roofing 2.5 2.5 5 guard guard 5 5 10 guard guard
strip
Units per BM for 2.21 2.21 4.42 guard guard 4.42 4.42 8.84 guard guard
UNI 1
Units per BM for
UNI 2
2.31 2.31 4.62 guard guard 4.62 4.62 9.24 guard guard
Example quantity calculation
The length of the roof near the drip edge is 6 m and the rafters are 5 m long. UNI 1 roofing material
is installed and the project is located in snow zone II.
6 x 2.21 = 13.26 (length of the edge near the drip edge x coefficient from the table = number of
snow retainers)
The result is 13.26 which is rounded up to 14. This means we need 14 snow retainers in a
configuration matching Fig. A.
Important notice!
1. K&J&G completes standard price offers and laying plans for snow zones I. and II.
2. If the order does not contain the quantity and positioning of snow retainers or a definition of the
snow zone in which the project is located as a reference material for the price calculation, the sales
department will proceed pursuant to Point 1 and is not liable for any damage to materials or
property caused by an insufficient or technically deficient solution for the given roof.
Table showing the standard snow loads in individual areas pursuant to the STN EN 1991-1-3 standard.
Snow Zone
s k – characteristic
property of snow on the
ground (kN/m 2 )
Reference calculation to
snow weight (kg/m 2 )*
Snow
density
I II III IV V
0.75 1.05 1.5 2.25 >2.5
75 105 150 225 >250

Fresh 100 kg/m 3 75 cm 105 cm 150 cm 225 cm >250 cm
Reference
calculation Settled (a few hours to days
200 kg/m 3 37.5 cm 53 cm 75 cm 112.5 cm 125 cm
after snow fall)
to snow
layer
Old (a few weeks to months
300 kg/m 3 25 cm 35 cm 50 cm 75 cm 83 cm
after snow fall)
(cm)*
Wet 400 kg/m 3 19 cm 26 cm 37.5 cm 56 cm 62.5 cm
* Reference calculation for characteristic value of snow S k
Map of snow load characteristics on the ground s k for snow zones I to V in Slovakia (source: STN EN 1991-1-
3/NA).
A more detailed map is shown in Chapter 4.1.
5.9. Peak - use and installation
Peaks are used to enclose roof surfaces at
the peak and at corners. The number of
peaks used depends on the type of roof.
Measure the length of the peak, the length of
the corners and the length of dormer peaks
in order to obtain a precise measurement.
Compare the dimensions with the standard
lengths (1920, 2820, 4020 mm) and then
order the total peak length you need on the
basis of such comparison. Other lengths can
be delivered upon specific customer requests.
Peak installation involves one of two
methods. The first is to anchor the peak
directly to the roofing material. In this case,
the upper peak gasket is installed directly
under the peak (1 m long) with one piece per
meter width of roof coverage being used. The
second method is to use peak laths and a top-roll sealing strip (5 m in length). Anchor the individual
parts of the peak to the roofing material using 4.8 x 20 screws in the upper part of the ridge profile
in every second ridge. Do not fasten the individual peak components to one another in order to
allow for temperature expansion. Full end caps are used to enclose roof peaks and rounded end caps
are used to close peaks on corners. Use 4.8 x 20 screws to anchor the end caps to the peak and the
roofing material.
Peak vents are installed in order to vent the roof between the individual standard peak components.
Such vents are recommended for installation every two metres. The covering width of a peak vent is
300 mm. Roof ventilation is also secured using an air gap which has an inlet (near the drip edge)
and outlet (near the peak) connected to outside air. Ventilation removes the moisture that
penetrates into the roofing material, removes the moisture that penetrates the roofing layer from
inside, removes the moisture from individual layers of the roof structure, limits the condensation of
water vapour in the roofing material, balances the temperature in the roofing material, removes
heat generated by sunlight and has an impact on limiting expansion due to temperature differences.
Effective air circulation in the air layer of a roof can only be achieved by properly sizing its crosssectional
area. The size of the opening near the drip edge primarily depends on the type of laths
used. It should be at least 200 cm 2 /standard metre for a ventilation distance of up to 10 m. The size
depends on the height of the top plate installed on the rafters (min. 30 mm). The openings near the
peak should have an area of at least 80 cm 2 /standard metre for an air distance of up to 10 m (drip
edge to peak). For larger distances, please consult the size and quantity of ventilation openings with
professionals at a sales outlet.

Peaks used on peaks and corners
Peak vent
5.10. Valley flashing
Full cladding should be installed at the site where valley
flashing is to be installed. This cladding should be installed at
the least up to the width of the valley flashing elements on
both sides. Secure the valley flashing using metal clips and
zinc coated nails. Overlap for valley flashing components is at
least 150 mm. Overlap depends on the slope of the roof.
Before installation of the roofing material, first apply a
universal sealing tape matching the roofing material colour
on both sides of the valley flashing.
5.11. Penetration bushings
Penetration bushings are used when a penetration
through a roof needs to be made (for antenna masts,
ventilation pipe, etc.). We deliver such bushings in
packages depending on the diameter of the required
penetration. Packages also contain 4.8 x 20 screws, the
bushing itself and a sealing adhesive. ATTENTION!
Penetration bushings are not coloured to match the
roofing material! Cut an opening in the roofing material
at the side where a penetration is needed. Push the
mast or pipe through the opening and then install the
penetration bushing around it. Clean the roofing
material using an appropriate degreaser (petroleum
based solvent). Apply the adhesive to the lower contact surface of the bushing and the surface of
the roofing material and then anchor the bushing using the provided screws installed around the
circumference of the bushing to the roof itself. Pull back the upper portion of the bushing which has
previously been cut to the desired diameter. This creates a perfectly sealed joint.
5.12. Roof-mounted windows
When installing a roof-mounted window, the roofing material at the installation site must be
separated and removed. The lower sheet ending below the roof-mounted window must end at the
distance stipulated by the window manufacturer (most are from 60 to 80 mm). In some cases the
lower roofing sheet comes right up to the roof-mounted window itself. It depends on the ridges in
the roofing material itself and the minimum overlap in roofing material sheets of 140 mm must be
maintained. Set aside the lower roofing material that comes into contact with the roof-mounted
window. Install the flashing for the roof-mounted window (based on the window manufacturer's
instructions). Replace the upper roofing sheet once the flashing for the roof-mounted window is
complete. Before installation, adjust the materials depending on how the roof-mounted window
contacts the individual sheets of metal roofing. Overlap on the lower and upper metal sheets must
be at least 140 mm. We suggest having a professional complete the installation based on the
demanding work involved.

5.13. Transposing roof slopes
Pursuant to STN 73 1901 Roof design. Basic provisions
Slope
in degrees
(°)
Annex 1
Slope
in
percentage
(%)
Slope
1:x
Slope
in degrees
(°)
Slope
in
percentage
(%)
Slope
1:x
0.5 0.87 1 : 114.90 22 40.40 1 : 2.48
1 1.75 1 : 57.10 23 42.45 1 : 2.36
1.5 2.62 1 : 38.20 24 44.52 1 : 2.25
2 3.49 1 : 28.60 25 46.63 1 : 2.14
2.5 4.37 1 : 22.90 26 48.77 1 : 2.05
3 5.24 1 : 19.08 27 50.95 1 : 1.96
4 6.99 1 : 14.30 28 53.17 1 : 1.88
5 8.75 1 : 11.43 29 55.43 1 : 1.80
6 10.51 1 : 9.51 30 57.74 1 : 1.73
7 12.28 1 : 8.14 31 60.09 1 : 1.66
8 14.05 1 : 7.11 32 62.49 1 : 1.60
9 15.84 1 : 6.31 33 64.94 1 : 1.54
10 17.36 1 : 5.67 34 67.45 1 : 1.48
11 19.44 1 : 5.14 35 70.02 1 : 1.43
12 21.26 1 : 4.70 36 72.65 1 : 1.38
13 23.09 1 : 4.33 37 75.36 1 : 1.32
14 24.93 1 : 4.01 38 78.13 1 : 1.28
15 26.80 1 : 3.73 39 80.98 1 : 1.23
16 28.68 1 : 3.49 40 83.91 1 : 1.19
17 30.57 1 : 3.27 41 86.93 1 : 1.15
18 32.49 1 : 3.08 42 90.04 1 : 1.11
19 34.43 1 : 2.90 43 93.25 1 : 1.07
20 36.40 1 : 2.75 44 96.57 1 : 1.04
21 38.39 1 : 2.61 45 100.00 1 : 1.00
UNI 1 roofing sheets with accessories - shapes and dimensions
Marking
of product
Profile shape
UNI 1 Metal Roofing
Thickness Coverag
e
width
Part
lengt
h
Weight
of the
material
mm mm mm kg/m 2
UNI 1
23-1105
15-350
15 offset
height
zinc
0.5
aluminiu
m
0.68
1105 475
to
6500
zinc
4.6
aluminiu
m
2.19

UNI 1
23-1105
20-350
20 height
of sheet
zinc
0.5
aluminiu
m
0.68
1105 475
to
6500
zinc
4.61
aluminiu
m
2.2
UNI 1
23-1105
20-400
Accessories for metal roofing
Marking
of product
Profile shape
Rounded
peak
Peak
end cap -
full
Effective width 312 mm
zinc
0.5
aluminiu
m
0.68
1105 525
to
6500
zinc
4.61
aluminiu
m
2.2
Thickness Coverag
e
width
Part
lengt
h
Weight
of the
material
mm mm mm kg/m
zinc
0.5
aluminiu
m
0.68
zinc
0.5
aluminiu
m
0.68
1920
2820
4020
1920
2820
4020
zinc
2.35
3.45
4.92
aluminiu
m
1.12
1.64
2.34

Peak
end cap -
rounded
zinc
0.5
aluminiu
m
0.68
Peak
vent
zinc
0.5
aluminiu
m
0.68
Snow
guard
set:
screws
reinforceme
nt
underlay
strip
zinc
reinforceme
nt
1.5
strip
0.5
underlay
3
screws
4.8x75
4.8x35

MODULE 350 400
Total width 1195 mm 1195 mm
Structural covering width 1105 mm 1105 mm
Ridge height 23 mm 23 mm
Offset height 15 mm, 20 mm 20 mm
Overall height 38 mm, 43 mm 43 mm
Minimum length 475 mm 525 mm
Maximum length * 6500 mm 6500 mm
Lath spacing ** 350 mm 400 mm
Minimum possible slope *** 14° 14°
Weight for zinc-coated sheet metal Around 5 kg/m 2 Around 5 kg/m 2
Weight for aluminium sheet metal Around 2.4 kg/m 2 Around 2.4 kg/m 2
* Roofing sheet lengths can be custom ordered to measure (roofing with extended lengths can be produced
after prior agreement)
** See supporting lath methods
*** Min. slope of 14° for lengthwise joints; if the roof has no lengthwise joints, the minimum slope is 12°