Knauf Free-Spanning Ceiling D131

Technical Data Sheet D131 

Edition 2005-06 

Knauf 

Free-Spanning Ceiling 

For free-spanning ceiling F90 

see Technical Data Sheet K219 

D131 

Knauf Free-Spanning Ceiling - metal grid CW/UW 

The structural, statical properties, and characteristic building physics of Knauf systems 

can solely be ensured with the exclusive use of Knauf system components, or other products 

expressly recommended by Knauf.

Knauf Free-Spanning Ceiling 

Fire protection from below / from below and from above (plenum) 

Ceilings that are fire protection rated on its own 

Requirement to the basic ceiling 

for fire protection: 

from below 

no fire protection requirements 

to basic ceiling / roof construction 

from above (plenum) 

the basic ceiling should have 

the same fire protection rate 

as the underceiling 

Fire protection 

rate for 

fire stress from 

below 

above 

Knauf System Constructions 

cladding 

minimum 

thick- 

ness 

type/ 

building 

material 

class 

mm 

metal 

grid 

max. spacing 

of C profiles 

b 

mm 

insulation 

(required 

for fire protection) 

min. 

thickness 

mm 

minimum 

density 

kg/m³ 


Proof 

D131 Free-Spanning Ceiling 

solely from below 

18 625 

mineral wool 

40 - 

G 

F30 

Fire-Resistant 

Boards 

GKF, A2 

25 625 

without insulation 

or 

min. B2 

ABP 

P-3964/2172 

2x 12.5 500 

D131 Free-Spanning Ceiling 

solely from below and from above 

cover strips GKF 25 mm 

F30 

F30 

Fire-Resistant 

Boards 18 625 

GKF, A2 

mineral wool S 

40 40 

or 

60 30 

ABP 

P-3964/2172 

cover strips GKF 25 mm 

F30 

F30 

Fire-Resistant 18 

Boards + 625 

GKF, A2 12.5 

covering layer 


or 

min. B2 

ABP 

P-3964/2172 

Flanking components should have a fire protection rate of F30. 

Mineral wool insulation according to DIN EN 13162, chapter 3.1.1 

building material class A 

S melting point 1000° C, G building material class A 

according to DIN 4102-17 

2 

Note Free-Spanning Fireboard Ceiling A1: F90 solely from below; F90 solely from below and from above - see TDS K219


Fastening 

Fastening of load bearing perimeter runners 

Fastening to 

Anchor 

Maximum 

spacing of 

anchors 


metal stud partitions 

(fastening to metal studs) 

reinforced concrete walls 

substantial masonry 

without cavities or 

light concrete (density 1000 kg/m³) 

other materials 

2x Knauf All Purpose Screw FN 4.3x35 

2x Knauf All Purpose Screw FN 4.3x65 

Knauf Ceiling Steel Dowel 

Knauf Nailable Plug L 8/80 

Knauf Nailable Plug L 8/80 

suitable anchors 

minumum shear load capacity 0.35 kN per anchor 

625 mm 

300 mm 

For room widths 2.25 m the number of anchors can be reduced by 50 % respectively the spacing of the anchors can be doubled. 

Connections to partitions 

Knauf single or double CW profiles 

Screwing of Knauf CW double profiles 

750 mm 

625 mm 

30 mm 

Knauf UW runner 

Knauf CW double profiles with cover strip 

625 mm 

Connect Knauf CW profiles as 

single or double profiles (per flange) 

with UW runner by riveting, 

crimping or screwing with Knauf 

Metal Screws LB 3.5x9.5 mm. 

cover strip GKF 25 mm 

120 mm wide 

screw Knauf CW profiles at web 

with metal screw LB 3.5x9.5 mm 

at a spacing of 750 mm 

Alternating screwing 

cover strip / cladding 

cover strip GKF 25 mm, 120 mm wide 

Knauf Drywall 

250 

Screw TN 3.5x35 

cladding 

170 

500 mm 

Knauf CW double profile 

cut edge joint 

30 mm 



170 

340 mm 

3


Without fire protection 


Cladding GKB 

12.5 mm 

or 

2x 12.5 mm 

or 

18 mm 

A 

A 

Screws 

b 

C 


Screws 

single layer cladding 

12.5 mm TN 3.5x25 

18 mm TN 3.5x35 

double layer cladding 

1st layer: TN 3.5x25 

2nd layer: TN 3.5x35 

Maximum 

spacing 

of screws 

170 mm 

500 mm 

170 mm 

maximum room width 5,5 m 

C 

Maximum room width in m 

Knauf CW profile Knauf CW profile 

as load bearing 


as load bearing 


as perimeter 

channel channel connection 

metal thickness 

0.6 mm 

max. room width 


at max. spacing of profiles b at max. spacing of profiles b 

500 mm 500 mm 625 mm 

cladding 

cladding 

12.5 mm 2x 12.5 mm 12.5 mm 

2x 12.5 mm 

metal thickness 

0.6 mm 

CW 50 

CW 75 

CW 100 

CW 125 

2.5 

3.25 

3.75 

4.25 

2.25 

2.75 

3.25 

3.75 

3 

3.75 

4.25 

5 

2.5 

3.25 

3.75 

4.25 

2.75 

3.25 

4 

4.5 

UW 50 

UW 75 

UW 100 

UW 125 

CW 150 4.75 4.25 

5.5 

4.75 

5 

UW 150 

Details scale 1:5 

18 mm 

connect free-spanning 

Knauf CW profile 

to UW runner 

by riveting, 


crimping or with 

Metal Screws 

Knauf UW runner, 

e.g. LB 3.5x9.5 

fastening according to page 3 

Knauf CW profile as connect 

load bearing channel free-spanning 

CW double profile 

(per flange) 

UW runner 

to UW runner 

as perimeter 

by riveting, crimping 

connection 

or with Metal Screws 

e.g. LB 3.5x9.5 


as load bearing channel 

Metal Screw 

LB 3.5x9.5 

a 750 mm 

75 mm 

62.5 mm 

68 mm 

Knauf Boards 2x 12.5 mm Knauf Board 12.5 mm Knauf Board 18 mm 

500 mm 

b 

b 

500 mm 

500 mm 

b 

b 

625 mm 

625 mm 

b 

4 

D131-A1 

Structural 

connection to partition 

D131-C1 

Cut edge joint 

single profile 

D131-C2 


double profile


Fire protection 

Cladding GKF 

18 mm 

mineral wool insulation 

according to 

DIN EN 13162, 

chapter 3.1.1 

building material 

class A 

thickness 40 mm 

Screws 


Screws 

single layer cladding 

TN 3.5x35 

double layer cladding 

1st layer: TN 3.5x25 

2nd layer: TN 3.5x35 



metal thickness 0.6 mm 

25 / 2x 12.5 mm 


or min. B2 

Max. 

spacing 

of screws 

170 mm 

500 mm 

170 mm 


2x CW 50 

2x CW 75 

2x CW 100 

2x CW 125 

2x CW 150 

● solely from below 

Max. spacing of 

profiles 

b 

D 

Cladding 

625 mm 

18 / 25 mm 

500 mm 2x 12.5 mm 

D 

b 

min. thickness 

B 

max. room width 4.75 m 

B 


in case of additional 

exposed ceiling (s. pg. 7) 

(max. 0.15 kN/m²) 

2.25 2 

3 

2.75 

3.5 

3.25 

4 

3.5 

4.75 4 

C 

C 

A 

A 



as perimeter connection 


UW 50 

UW 75 

UW 100 

UW 125 

UW 150 


Knauf UW runner connected to 

metal stud of partition with 

Knauf All Purpose Screws 2x FN 4.3x35 (according to pg. 3) 



D131vu-D1 partition 

Knauf Solid Board 25 mm 


Knauf Solid Board 25 mm 

Load bearing 

connection to 

D131vu-B1 Longitudinal edge joint 

connect free-spanning CW double profile Knauf CW double profile 


(per flange) to UW runner as load bearing channel 

by riveting, crimping or with Metal Screws 

Knauf UW runner, fastening according to page 3 

e.g. LB 3.5x9.5 


as perimeter connection 

mineral wool 

building material class A 

min. thickness 40 mm 

(required for 

fire protection) 

Knauf Board GKF 18 mm 

500 mm b 

Knauf Boards GKF 

2x 12.5 mm 

b 625 mm 625 mm b 

D131vu-A1 

Structural 

connection to partition 

D131vu-C1 Cut edge joint 

75 mm 


as load bearing profile 

68 mm 75 mm 

5


Fire protection F30 ● solely from below and from above 


A 

b 

C 

b 

A 

D 

D 

C B B 

max. room width 4 m max. room width 4 m 

Mineral wool insulation 

S 

according to DIN EN 13162, chapter 3.1.1 building material class A, 

melting point 1000°C (1832°F), according to DIN 4102-17 

thickness: 60 mm; density: 30 kg/m³ or 

thickness: 40 mm; density: 40 kg/m³ 

Additional layer: 12.5 mm GKF 

applied loose with tight joints 

complete covering of Knauf CW profiles 

including cover strips 

Cladding 

Cover strip 

Max. spacing of Knauf Drywall Screws TN 3.5x35 

18 mm GKF 

25 mm GKF 

b 120 mm 

cladding 

cover strip 

170 mm 

250 mm 





Max. spacing of 

profiles 

b 

Cladding 

min. thickness 



in case of additional as perimeter connection 

exposed ceiling 

(max. 0.15 kN/m²) 

(see pg. 7) 


2x CW 50 

2x CW 75 

2x CW 100 

2x CW 125 

625 mm 

18 mm 

2.25 

3 

3.5 

4 

2 

2.75 

3.25 

3.5 

UW 75 

UW 100 

UW 125 

UW 150 


60 mm 

complete covering with 

Knauf Boards GKF 12.5 mm 



fastening according to page 3 

625 mm b 

Structural connection to partition 

D131vuvo-A2 

with additional layer, without insulation 

Knauf All Purpose Screw 2x FN 4.3x35 

fastened to metal stud of partition 


120 mm wide 




cover strip GKF 

25 mm, 120 mm wide 

D131vuvo-B2 

10 

105.5 mm 

Longitudinal edge joint with 

additional layer, without insulation 

120 mm 


10 

100 

as wall 

connection 

mineral wool S 

60 mm; 30 kg/m³ 

or 

40 mm; 40 kg/m³ 

93 mm 

6 





Load bearing connection to partition 

D131vuvo-D1 

with insulation 

b 625 mm 625 mm b 


D131vuvo-C1 


Knauf Board GKF 18 mm

Knauf Ceiling below Ceiling 

Knauf Apertura Acoustical Ceiling below Free-Spanning Ceiling D131 


Free-Spanning Ceiling D131 

as fire protection ceiling 

F30 


1 


and from above 

Example: 

fire protection 

F30 



a 

suspender spacing of exposed ceiling 

1 

Proof: 

ABP P-3964/2172 

2 

Exposed ceiling 

0.15 kN/m² 

e.g. Acoustical Ceiling 

insulation (building 

material class A) allowable 

2 

b 

spacing of lower channels 

b 

c 

spacing of upper channels 

Free-Spanning Ceiling as fire protection ceiling 

The additional dead load of the exposed ceiling 

( 0.15 kN/m²) has to be considered for the maximum 

ceiling span (room width) of the Free-Spanning Ceiling. 

Maximum room widths can be taken from the tables 

on pages 5 and 6. 

Detail scale 1:5 

1 

Maximum spacings of exposed ceiling 2 all dimension in mm 

Maximum Maximum spacing Maximum 

spacing of c suspenders *) a spacing of b 

upper channels 

load bearing capacity class 

lower channel 

up to 0.15 kN/m² 

1000 

1200 

625 

500 

500 

(for Acoustical 

Ceilings see D12) 

*) Suspension must be fastened to load bearing channels of the fire protection ceiling. 

fastening of UW runner to wall according to page 3 


Knauf All Purpose Screw FN 

Universal Bracket for CD 60x27 

(install alternating) 

D131-D112 

Knauf Board 

2 1 

Knauf Exposed Ceiling below Free-Spanning Ceiling 

1st Ceiling level 1 

Free-Spanning Ceiling D131 

as fire protection ceiling 

2nd Ceiling level 

exposed ceiling 

0.15 kN/m² 

alternative suspension: 

Direct Bracket 

2 

example: 


F30 


Note 

References 

upper channels of exposed ceiling always lateral to load bearing channels of Free-Spanning Ceiling 

loading of exposed ceiling max. 100 N per suspender 

Technical Data Sheet D12 Knauf Acoustical Ceilings 

7


Control joints, ceiling plan, settlement joint, Ceiling Bulkhead 


Examples: Fire Protection F30 solely from below and from above with insulation 


board strip GKF 25 mm 

Drywall Screw TN 3.5x35 mm 

board strip GKF 25 mm 

Knauf Nailable Plug L8/80 

20 mm 

5 

D131-SO-A1 

Knauf CW profile Knauf UW runner 

Connection to solid wall 

with shadow gap 

Edge Trim if necessary 

e.g. Knauf Fugenfüller Leicht 

D131-SO-D1 

5 

20 mm 

Connection to solid wall 

with shadow gap 

D1 

D1 

B2 

A1 

A1 


C1 

C1 

lighting 

B1 

B1 

C2 

Access Panel 

C2 

C3 

C3 

A2 

A2 


B2 

Ceiling plan 

Details lighting and access panel see page 9 


board strip 

GKF 18 mm 

glued with Knauf 

Fugenfüller Leicht 

on one side 

25 

100 mm 

a 

25 

a 

100 mm 


Edge Trim if 

necessary 

a 20 mm 


Knauf All Purpose Screw 

FN 4.3x35, screwed into 

metal profile of ceiling bulkhead 

ceiling bulkhead 

fire protection F30 

installation according to 

Technical Data Sheet D16 

Knauf Ceiling Built-ins 

8 

D131-SO-C3 

Settlement joint 

D131-SO-A2 

Ceiling bulkhead


Lighting fixtures, access panel 


Fire protection covering of lighting fixtures is possible for Knauf Free-Spanning Ceilings 



Access Panel 

steel brackets 

according to DIN 18182 

additional profile 

(not necessary for openings 

up to 200 mm width) 

625 mm 

25 

400 mm 

covering 400 x 1000 mm 

made of Knauf Boards GKF 25 mm 

fixing of lighting 

fixture according 

to manufacturers 

instructions 

Lateral section lighting fixture 

example: F30 solely from below 

height 25 

of lighting box 

steel brackets 

according to DIN 18182 

D131-SO-B1 

25 

1000 mm 

covering 

400 x 1000 mm 

made of Knauf Boards 

GKF 25 mm 

fixing of lighting 

fixture according 

to manufacturers 

instructions 

Longitudinal section lighting 

fixture 

example: F30 solely from below 


Lateral section 

access panel 

Example: 

F30 solely from below 




without insulation, with 

additional layer 



6 


625 mm 

board strips GKF 12.5 mm fastened to 

UW runner with 

Drywall Screws TN 3.5x25 

clearance 

450 mm 

board strips GKF 12.5 mm fastened to 

Knauf CW profile with Drywall Screws 

TN 3.5x25 and TN 3.5x35 

Alutop Access 

Panel 

6 

Drywall Screw TB 3.5x35 



D131-SO-B2 

Longitudinal section 

access panel 

Example: 

F30 solely from below 


without insulation, with 

additional layer 

Alutop Access Panel 

6 clearance 

6 

1500 mm 

Drywall Screw TB 3.5x35 



Alutop Access Panel 

Standard dimensions 

clearance 

450 mm x 1500 mm 

450 mm x 450 mm 

in-between sizes on request 

Alutop Access Panel can be 

hung out completely 

9


Material requirements 

of selected examples 


Material requirement per m² ceiling area without addition for loss and waste. 

description 

external material = printed italic 

unit 

(Amounts refer to a ceiling area of 2.5 m x 10 m = 25 m²) 

amount as average value 

without 


Knauf Boards 

GKB 12.5 mm 

spacing of 

channels 500 mm 



Knauf Boards GKF 18 mm 

spacing of channels 625 mm 

fire prot. solely from below + from above 

with insulation without insulation 

10 

connection to wall 

UW runner 50x40x0.6; (4.0 m long) 

resp. 


resp. 


resp. 

UW runner 125x40x0.6; (special) 

UW runner 150x40x0.6; (special) 

CW profile 50x50x0.6; (up to 5.0 m long) 

resp. 


resp. 


resp. 

CW profile 125x50x0.6; (special) 

resp. 

CW profile 150x50x0.6; (special) 

fastening of perimeter runner: 

resp. 

Knauf All Purpose Screw FN 4.3x35 

Knauf All Purpose Screw FN 4.3x65 

resp. 

Knauf Nailable Plug "L" 8/80; (50 pcs. box) 

resp. 

Knauf Nailable Plug; (100 pcs. box) 

connection double profile to perimeter runner 

e.g. 2x metal rivets 

metal grid 

Knauf CW double profile as load bearing channels: 

2x CW profile 50x50x0.6; (up to 5.0 m long) 

resp. 


resp. 


resp. 

2x CW profile 125x50x0.6; (special) 

resp. 

2x CW profile 150x50x0.6; (special) 

Knauf CW double profile screwed at flange: 

Knauf Metal Screw LB 3.5 x 9.5 mm 

insulation (consider fire protection; see page 2) 

cladding 

Knauf Board GKB; 12.5 mm 

resp. 

Knauf Fire-Resistant Board GKF; 18 mm 

cover strip 120 mm wide: 

Knauf Solid Board GKF; 25 mm 

additional layer: 

Knauf Fire-Resistant Board GKF; 12.5 mm 

Knauf Drywall Screws; (fastening of cover strips) 

TN 3.5 x 35 mm 

Knauf Drywall Screws; (fastening of cladding) 

TN 3.5 x 25 mm 

TN 3.5 x 35 mm 

joint filling 

Knauf Uniflott; (5 kg/25 kg bag) 

(for hand filling) 

or 

Knauf Jointfiller Super; (20 kg bag) 

(for machine filling with Ames Machine) 

or 

Knauf Fugenfüller Leicht; (5 kg/10 kg/25 kg bag) 

(for hand filling with joint tape) 

Knauf Joint Tape; (23 m/75 m/150 m roll) 

Trenn-Fix 65; (50 m roll) 

Edge Trim 23/15; (2.75 m long) 

m 

m 

pcs 

pcs 

m 3.8 

pcs 3.0 

m² 

m² 

m² - 

m² 

pcs 

pcs 

kg 

kg 

kg 

m 

m 

m 

0.8 0.8 

0.8 0.8 

0.2 0.2 

0.2 

0.2 

3.2 

as required 

1.0 

- 

- 

- 

19 

- 

0.3 

0.4 

0.3 

0.35 

1.0 

as required 

2.6 

3.0 

- - 

- 0.2 

0.2 

- 

3.0 3.0 

2.4 2.4 2.4 

as required 1.0 

as required 

- 

1.0 

- - 

- - 

1.0 

1.0 

1.0 

10 10 

- - - 

17 

17 17 

0.4 

0.5 

- - 

- - 

3.1 3.1 3.1 3.1 

- - 

0.4 

0.5 

0.4 

0.5 

0.4 0.4 0.4 

0.35 

0.35 

0.35 

1.0 

1.0 

1.0 

as required as required as required


Specifications 


Item Description No. of units Unit price Total price 

........ Ceiling DIN 18168-1, installation height in m ...................., 

ceiling span of free-spanning ceiling in m ............................., 

fi re resistance class according to DIN 4102-2 F 30,* 

for the ceiling solely resistant to fi re from below 

to protect the basic ceiling and the plenum, */ 

for the ceiling solely resistant to fi re from 

the plenum to protect the room below the ceiling, */ 

for the ceiling solely resistant to fi re from 

the plenum and from below to protect the room below the ceiling, 

the basic ceiling and the plenum, * 

anchored on reinforced concrete/ masonry/ 

metal stud partition/ wood frame partition/ ..........................., * 

metal grid made of galvanized metal channels, 

load bearing channels as single/ double * CW profi les CW 50/ 75/ 100/ 125/ 150 *. 

cladding made of Knauf Boards GKB/ GKF *, thickness 12.5/ 18/ 25/ 2x12.5 mm *. 

additional cladding made of Knauf Boards GKF, thickness 12.5 mm. * 

insulation made of mineral wool according to DIN EN 13162/ made of ........................ *, 

thickness in mm ..............., minimum density in kg/ m³ ..................., * 

building material class A/ B1/ B2 *, melting point min. 1000°C (1832°F). * 

Product/ System: Knauf Free-Spanning Ceiling D131 .......... m² .......... € .......... € 

........ Ceiling DIN 18168-1 as decribed above, with additional exposed ceiling. 

sound absorption coeffi cient according to DIN EN 20354 ............................................. * 

installation of acoustical ceiling with lower and upper channels, 

suspend with Universal Bracket to load bearing channels of Free-Spanning Ceiling D131, 

plenum damping with mineral wool, thickness min. 20 mm, * 

cladding made of Knauf Apertura Boards DIN 18180, board thickness 12.5 mm, 

perforation standard circular R: 6/18 R/ 8/18 R/ 10/23 R/ 12/25 R/ 15/30 R */ 

perforation alternating circular R: 8/12/50/ 12/20/66 * R/ 

perforation random Plus R: 8/15/20 R/ 12/20/35 R */ standard square Q: 8/18 Q, 12/25 Q *. 

Product/ System: Knauf Acoustical Ceiling D127 below Free-Spanning Ceiling D131 .......... m² .......... € .......... € 

........ Connection with joint, fi re resistance ...................*, 

for free-spanning ceiling, circumferential, installation according to drawing no.. ............... .......... m .......... € .......... € 

........ Control joint, fi re resistance ...................*, 

as upgrade to free-spanning ceiling, installation according to drawing no.. ............... .......... m .......... € .......... € 

........ Settlement joint, fi re resistance ...................*, 


........ Ceiling bulkhead/ ceiling protrusion *, height in m ................., 

fi re resistance ...................*, 


........ Cutout, as upgrade to free-spanning ceiling, 

diameter in mm .................../ dimensions in mm ....................... * ........ pcs .......... € .......... € 

........ Opening including reinforcement of metal grid, 

for lighting fi xtures/ ....................... *. 

as upgrade to free-spanning ceiling, dimensions in mm ..........................., 

installation according to drawing no.. ............... . ........ pcs .......... € .......... € 

........ Fire protection covering for built-in lighting fi xtures, 

fi re resistance ...................*, 

dimensions in mm ......................., installation according to drawing no.. ............... . ........ pcs .......... € .......... € 

........ Access panel, installation according to drawing no.. ............... .*, 

frame made of aluminium, dimensions in mm ...................., 

panel fi lling made of Knauf Boards, thickness in mm ................. , 

with extension-rod safety latch and non-visible lock and hinge system. 

for Knauf Free-Spanning Ceiling D131. 

Product: Knauf Access Panel D171 ........ pcs .......... € .......... € 

........ Additional fi lling of connections to built-ins. .......... m .......... € .......... € 

* Cancel not applicable items Sub-total ................ € 

11


Construction and application, jointing, surface treatment 


Construction 

Knauf Free-Spanning Ceilings are solely fastened 

to the walls at perimeter. Knauf Boards 

GKB/ GKBI impregnated, Fire-Resistant Boards 

GKF/ GKFI or LaVita Shielding Boards are 

screwed to a metal grid made of Knauf CW profi 

les as single or double profi les. 

The application of additional loads like lighting fi x- 

tures with max. 100 N (10 kg) per double profi le 

and exposed ceilings like e.g. D127 Knauf Apertura 

Acoustical Ceiling with load per unit area of 

Application 

Metal Grid 

● Perimeter connection to walls with UW runners. 

Fastening according to table page 3 at 

centers of ≤ 625 mm. 

● For sound protection requirements seal up 

carefully with acoustical sealant according to 

DIN 4109, supplement 1, chapter 5.2; porous 

sealant strips like Sealing Tape are usually not 

suitable in this case. 

● CW profi les as double profi les are screwed at 

web with metal screws LB 3.5 x 9.5 mm at 

max. 750 mm centers. 

● Support of CW profi les in UW runners ≥ 30 

mm. Crimp, screw or rivet upper fl anges of 

CW profi les and UW runners to each other if 

no covering strip is necessary. 

Jointing / Surface Treatment 

Jointing 

For higher optical quality requirements like occuring 

streak of light, Knauf boards with 4-AK 

edges are the ideal basis for a perfect jointing 

with joint tape, Knauf Fugenfüller Leicht or Readygips. 

With 4-AK Boards the usual displacement 

of cut edges of at least 400 mm can be replaced 

by the much more effective cross joint 

application and jointing. 

Filling Material 

Fill joints with Knauf Uniflott without using tape. 

If using tape, hand fill with Knauf Fugenfüller 

Leicht or with Ames Machine and Knauf Jointfiller-Super. 

Knauf Unifl ott impregnated is additionally water-repellent 

and fi ts to the color of impregnated 

Knauf Boards. Use Knauf Finish-Pastös for the 

fi nal fi lling coat as fi ne skimming before sanding 

the joints. 

Application 

For double layer cladding, fill joints of first layer, 

smooth joints of second layer. Cover all screw 

heads as well. 

Recommendation: Fill and tape cut edges of 

visible layers no matter which filling material is 

used. 

Knauf Spezialgrund as primer for skimming of 

entire ceiling surface to regulate the behavior of 

soaking and to improve the optical conformity is 

15 kg/m² resp. max. single load of 100 N with 

suitable anchors directly to the metal grid is permissible. 

Joints of free-spanning channels are 

not allowed! Settlement joints have to be taken 

over into the construction of the free-spanning 

ceilings. Use control joints in the case of ceiling 

areas over approx. 15 m length, or for narrow 

ceiling spaces caused by a break of a wall. 

Separate connections of boards to components 

made of a different building material, 

Cladding 

● Screw Knauf Board Strips GKF, 25 mm thick, 

as covering strips on upper fl anges of CW 

profi les with Drywall Screws TN 3.5 x 35 mm 

at max. 250 mm centers, on CW double profi 

les alternating. 

● Apply Knauf Boards lateral to CW profi les. 

● Displace cut edge joints at least 400 mm while 

placing them on profi les. If using 4AK Boards 

(4-side taperd egdes) cross joints are allowed 

in connection with fi lling with joint tape. 

● Start fastening of Knauf boards either in the 

middle or at a corner in order to prevent upsetting 

deformation. Press boards fi rmly on to 

the grid and screw with Drywall Screws TN at 

170 mm centers alternating to CW profi les. 

a system component to create of surfaces with 

higher quality standards according to data sheet 

no. 2 „Verspachtelung von Gipsplatten - Oberfl 

ächengüten“ of the IGG. 

Application temperature/ climate 

Filling and covering of joints should only take 

place after the boards have been allowed to rest 

in the given humidity and temperature zones, 

and no more longitudinal changes can be expected, 

i.e. expansion or contraction. Joints 

should be filled at a minimum temperature of 

10°C. In case of mastic asphalt screed, fill in 

joints after screed has been applied. 

Surface Treatment 

Use a primer on Knauf Boards before coating or 

painting them. Ensure that the primer and the 

coat or paint are compatible. 

After wallpapering of paper and fi ber glass wallpapers 

and the application of resin / cellulose 

plasters quick drying must be assured through 

adequate airing. The following coats can be 

used to cover Knauf Boards: 

● Wall Papers: paper-, textile and synthetic wall 

papers. Use only adhesives made of cellulose 

according to „Merkblatt Nr. 16, Technische 

Richtlinien für Tapezier- und Klebearbeiten“, 

Frankfurt/Main 2002, released by Bundesausschuss 

Farbe und Sachwertschutz. 

especially columns, or thermical highly stressed 

built-ins like lighting fi xtures, for instance with 

control joints. 

Knauf profi les are delivered galvanized. The corrosion 

protective coating is suffi cient for indoor 

application, including bathrooms and kitchens in 

private housing. For other areas, e.g. under infl 

uence of outdoor air, additional corrosion protection 

is necessary (see DIN 18168-1 table 2). 

● Screwing of boards, 12.5 mm thick, with Drywall 

Screws TN 3.5 x 25 mm; 18 or 25 mm → 

TN 3.5 x 35 mm; 2 x 12.5 mm → TN 3.5 x 25 

mm + TN 3.5 x 35 mm. 

● With double layer cladding centers of screws 

of fi rst layer can be extended to max. 500 mm 

if the second layer is applied subsequently 

(within one working day). 

● Use separation strip Trenn-Fix 65 and fi ller 

or acrylate for connections to other components. 

Ceiling below ceiling 

Application according to instructions on page 7. 

● Plasters: Knauf structured plasters, e.g. re sin 

plasters, thin plasters, entire area smoothing 

like e.g. Knauf Board-Finish, mineral plasters 

in connection with paper taped jointing. 

● Coats: Washable and abrasion-proof emulsion 

paint, multicolored (rainbow) emulsion, 

oil paint, matte-fi nish lacquer, alkyd resin 

paint, polymer resin paint, PUR lacquer, or epoxybased 

lacquer, according to intended use 

or as required. 

● Alkaline coats such as lime, water glass colors 

and silicate-based paints are unsuitable 

for gypsum board surfaces. Silicate-based 

emulsion paints may be used after referring to 

the manufacturer’s recommendations and following 

the stipulated guidelines closely. 

Gypsum board surfaces that have constantly 

been exposed to light without any protection can 

develop yellowing agents that show up despite 

a coat of paint. Therefore a trial coat is recommended 

that will extend across several boards 

including all joints. Yellowing can, however, be 

successfully avoided only by using a special 

shielding primer. 

Knauf Direkt Technical Information Service: Phone +49 18 05 / 31-10 00, Fax +49 18 05 / 31-40 00 

Knauf websites: www.knauf.de, www.knauf.com e-Mail: knauf-direkt@knauf.de 

Knauf Headquarters, Am Bahnhof 7, D-97346 Iphofen, Phone +49 93 23 / 31-0, Facsimile +49 93 23 / 31-277 

12 

© All technical changes reserved. Only the current printed instructions are valid. Our warranty is expressly limited to our products in flawless condition. All application quantities and delivery amounts are based on empirical data that is not easily transferable to 

other deviating areas. All rights reserved. All amendments, reprints and photocopies, including those of excerpts, require the express permission of Knauf Gips KG, Am Bahnhof 7, 97346 Iphofen, Germany. 

Edition: June 2005 

D131 / engl. / D / 06.05 / FB / D

Knauf Free-Spanning Ceiling D131

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