Hello forum,
and first of all, Merry Christmas to everyone.
I have a question regarding counter battens in my roof insulation work.
In my roof structure, I have installed 200mm (8 inches) insulation between the rafters and sealed it with a vapor barrier foil.
Now, I want to install the counter battens (24mm (1 inch) battens, with the spaces also insulated) to attach the drywall (gypsum board) to them.
What spacing between the battens is recommended?
A 600mm (24 inches) spacing seems too wide to me. Could the drywall sag or possibly warp over time?
I started the first batten at the knee wall and then spaced them every 600mm (24 inches) upwards. At the top, I attached another batten.
Or should I place a batten along the rafters?
and first of all, Merry Christmas to everyone.
I have a question regarding counter battens in my roof insulation work.
In my roof structure, I have installed 200mm (8 inches) insulation between the rafters and sealed it with a vapor barrier foil.
Now, I want to install the counter battens (24mm (1 inch) battens, with the spaces also insulated) to attach the drywall (gypsum board) to them.
What spacing between the battens is recommended?
A 600mm (24 inches) spacing seems too wide to me. Could the drywall sag or possibly warp over time?
I started the first batten at the knee wall and then spaced them every 600mm (24 inches) upwards. At the top, I attached another batten.
Or should I place a batten along the rafters?
Hello,
According to Isover, the insulation below the rafters can be used without any concerns in my case.
The insulation below the rafters also has the advantage that the rafter beams, which are only insulated on the sides, are additionally insulated on the front side through this extra layer.
I informed the service representative that opinions in a forum vary on the insulation with different justifications.
The additional insulation also has no negative effects regarding condensation or similar issues.
One more thing about the installation of my membrane, since there is a discussion here about the load-bearing capacity of the battens:
At the upper section of the roof slope, I installed the membrane longitudinally along the rafter beams. The roll width of the membrane was 1500mm (59 inches), then cut to 600mm (24 inches) to match the rafter spacing.
Using the “short” 1500mm (59 inches) strips made handling easier (I did this alone).
I cut out the collar beams and sealed them at the end.
Afterwards, I installed a full length of membrane longitudinally along the rafters. This saved me a lot of taping and cutting.
I closed off the knee wall connection with two strips measuring 1500mm x 350mm (59 inches x 14 inches).
Then I measured the distance between the collar beam and knee wall and divided it into 7 equal sections.
The internal measurement is 26cm (10 inches), resulting in a center-to-center batten spacing of 28.4cm (11 inches).
For my first roof slope, I used a 600mm (24 inches) measurement which was not optimal. -- Learning by doing --
Here is a picture: (Red outline shows the installation method)
According to Isover, the insulation below the rafters can be used without any concerns in my case.
The insulation below the rafters also has the advantage that the rafter beams, which are only insulated on the sides, are additionally insulated on the front side through this extra layer.
I informed the service representative that opinions in a forum vary on the insulation with different justifications.
The additional insulation also has no negative effects regarding condensation or similar issues.
One more thing about the installation of my membrane, since there is a discussion here about the load-bearing capacity of the battens:
At the upper section of the roof slope, I installed the membrane longitudinally along the rafter beams. The roll width of the membrane was 1500mm (59 inches), then cut to 600mm (24 inches) to match the rafter spacing.
Using the “short” 1500mm (59 inches) strips made handling easier (I did this alone).
I cut out the collar beams and sealed them at the end.
Afterwards, I installed a full length of membrane longitudinally along the rafters. This saved me a lot of taping and cutting.
I closed off the knee wall connection with two strips measuring 1500mm x 350mm (59 inches x 14 inches).
Then I measured the distance between the collar beam and knee wall and divided it into 7 equal sections.
The internal measurement is 26cm (10 inches), resulting in a center-to-center batten spacing of 28.4cm (11 inches).
For my first roof slope, I used a 600mm (24 inches) measurement which was not optimal. -- Learning by doing --
Here is a picture: (Red outline shows the installation method)
Were there any indications regarding the mechanical reinforcement of the adhesive joints using pressure battens, or did expansion loops of the membrane play a role in the discussions with the manufacturer about the durability of the (to be executed without tensile forces) adhesive joints?
@Venice
I would have guessed about 8cm (3 inches), so minus the 5cm (2 inches) of the battens, that would leave about 1.5cm (0.6 inches) next to the batten for the insulation under the rafters on the front side.
Okay, always something new.
What more could you want,...
Best regards
The insulation under the rafters would also have the advantage that the rafter beams, which are only insulated on the sides, would be insulated on the front side as well through the additional insulation.How wide are your rafters?
I would have guessed about 8cm (3 inches), so minus the 5cm (2 inches) of the battens, that would leave about 1.5cm (0.6 inches) next to the batten for the insulation under the rafters on the front side.
Okay, always something new.
The additional insulation would also have no negative effects regarding condensation, etc.Nothing better could happen to you. I would definitely keep that email saved, because it gives you solid protection even in a new build situation, with the increased moisture and the vapor diffusion (sd) values in your case.
What more could you want,...
Best regards
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