Kalzip® Systems

Design specifications
6.8 Thermal expansion
Temperature changes can cause length
variations and these must be taken into
account. The thermal expansion coefficient
of aluminium in the observed temperature
range is approx 24 x 10–6/K. When the profiled
sheets are installed at a given temperature
of 20°C, there will be an expansion
in sheet length of approx. 1.5 mm/m in
summer (+ 80°C) and a contraction in sheet
length of approx. 1 mm/m in winter (-20°C).
However, as adjacent components are
also subject to variations in temperature,
and the substructure can usually absorb
elongations, a variation in movement of
± 0.5 mm/m may be applied to the sheet
length in practice. If these requirements
are not fulfilled then the maximum values
stated above must be assumed.
6.9 Design of fixed points
Kalzip aluminium clip /
Kalzip composite clip
The fixed point prevents slippage of the
profiled sheets and is the point of each
Kalzip profiled sheet that is not subject to
a change of length. Each Kalzip profiled
sheet is to be secured at the fixed point
against displacement.
Aluminium clip
Fixed point with
Gesipa PolyGrip
Aluminium-Blind rivet
Ø 4.8 x 10 K9,5
Fixed points are statically verified and
are to be taken from the installation plan.
A hole for the blind rivet is drilled through
the small flange into the head of the clip at
an angle of 45-60° degrees, the rivet is inserted
and the swage head is covered by
the large flange of the next profiled sheet.
Alternatively, the fixed point is manufactured
by the insertion of bolts through the
webs of the Kalzip and the fixed point clip.
Sealing washers must be inserted on both
sides (bolt head and nut). If a composite
clip is used for the fixed point, all drilling
swarf must be removed from the profiles,
since the composite clip is made of plasticsheathed
steel. Rust stains on the profiled
sheets are thus avoided. For the further
installation of the roof surface, the Kalzip
profiled sheets are placed with the large
flange on the small flange, aligned to the
eaves and only then pressed into the next
row of clips.
If the fixed point is not located directly at
the roof ridge, then the elongation of the
Kalzip profiled sheets from the fixed point to
the roof ridge must be taken into account
when forming the covering of the roof ridge.
Each Kalzip profiled sheet may have only
one fixed point. Kinks in the Kalzip profiled
sheet, fixed lighting elements etc. are likewise
fixed points and must be taken into
account. No second fixed point may be
manufactured.
6.10 Ridge, eaves, gable ends
The standard ridge consists of three components:
The ridge closure with its chamber reduces
the wind pressure and at the same time
fixes and protects the foam filler against
UV radiation and birds. The foam filler
acts as an additional “sealing” of the end
of the Kalzip sheet preventing rain water
from pene trating into the system. The folding
up is the final protection against the
ingress of rain water into the ridge.
Generally the ridge is also the place where
the fixed point is located. If the fixed
point is positioned elsewhere, then the
ridge must be designed as a sliding structure
to be able to accom modate the expansion
movement of the profiled sheets.
It is a fact that ventilated ridges cannot
be completely sealed against snow. In
case of high sealing demands or direct
exposure to strong wind additional measures
such as the installation of wind deflector
plates or similar devices will be
neccessary.
At the eaves the drip angle stiffens the
bottom sheet and keeps the eaves filler in
position. On extremely low pitch roofs both
the eaves filler and the folding down of the
bottom sheet ensures that no water can
flow back towards the building. The gable
end is secured by the gable end hook and
the gable end clamping section.
(see page 13).
45-60°
Composite clip
Fixed point with
Gesipa PolyGrip
Aluminium-Blind rivet
Ø 4.8 x 10 K9,5
Screw M6,
stainless steel
Kalzip
Clip
Note to Blind rivet:
See Kalzip approval and table on page 42.
Kalzip 43