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?
Venice schrieb:
I plan to have the blower door test performed after completing the insulation work.
Once again, addressing this critical point:
For me, the primary benefit of such a measurement is not mainly to determine the so-called air change rate and compare it with energy saving regulations or DIN standard limits to ensure a restriction of ventilation heat losses.
If such a test is conducted at a time when the airtight layer is still accessible, even the smallest leaks can be identified and properly sealed!
I consider this differential pressure-based leak detection to be one of the most important quality assurance measures during interior construction.
Wishing you a successful building year 2010
KPS
Hello @Venice,
You are probably referring to the insulation beneath the rafters.
If there is any uncertainty, I consider it essential to contact the hotline of (in this case Isover) and provide the complete structural details of the relevant components. For the pitched roof, for example, from outside to inside:
Hard roof covering (roof tiles or shingles)
Battens + counter battens
Underlay or deck membrane (designation, manufacturer, SD-value)
Rafter dimensions and spacing
Insulation between rafters (designation, manufacturer, thickness, thermal conductivity class (WLG))
Vapor barrier / airtight membrane (designation, manufacturer, SD-value, etc.)
Further planned:
If applicable, insulation beneath the rafters between
the timber substructure for (e.g., single-layer) gypsum board sheathing (12.5 mm) spaced at about 30 cm (12 inches).
Question: Is insulation beneath the rafters unproblematic, and if so, in what thickness and WLG?
Such assemblies must be professionally designed! The above-mentioned inquiry possibility with the manufacturer is no substitute for this ... and inquiries in internet forums are never sufficient.
(3 answers – 3 opinions, and each says something different … but none will be liable for their statement!)
The national building regulations and energy saving ordinances do not require this without reason — such services must be carried out by qualified professionals.
This applies both to design, construction, and its control. Those without the required expertise must purchase external knowledge.
So, public building law applies here, which the client (as the "general obligor") cannot simply waive or replace with, for example, (possibly dubious) internet “knowledge.”
Kind regards
KPS
You are probably referring to the insulation beneath the rafters.
If there is any uncertainty, I consider it essential to contact the hotline of (in this case Isover) and provide the complete structural details of the relevant components. For the pitched roof, for example, from outside to inside:
Hard roof covering (roof tiles or shingles)
Battens + counter battens
Underlay or deck membrane (designation, manufacturer, SD-value)
Rafter dimensions and spacing
Insulation between rafters (designation, manufacturer, thickness, thermal conductivity class (WLG))
Vapor barrier / airtight membrane (designation, manufacturer, SD-value, etc.)
Further planned:
If applicable, insulation beneath the rafters between
the timber substructure for (e.g., single-layer) gypsum board sheathing (12.5 mm) spaced at about 30 cm (12 inches).
Question: Is insulation beneath the rafters unproblematic, and if so, in what thickness and WLG?
Such assemblies must be professionally designed! The above-mentioned inquiry possibility with the manufacturer is no substitute for this ... and inquiries in internet forums are never sufficient.
(3 answers – 3 opinions, and each says something different … but none will be liable for their statement!)
The national building regulations and energy saving ordinances do not require this without reason — such services must be carried out by qualified professionals.
This applies both to design, construction, and its control. Those without the required expertise must purchase external knowledge.
So, public building law applies here, which the client (as the "general obligor") cannot simply waive or replace with, for example, (possibly dubious) internet “knowledge.”
Kind regards
KPS
@KPS
The tension direction of the membrane runs from rafter to rafter.
So approximately 60 cm (24 inches), the deflection can also be seen in the photos.
This means whether the membrane is supported only at a "point load" or over a "surface load" makes a significant difference, especially with thin membranes.
The surface loads differ by several times.
The wind forces are definitely relevant if the underlay membrane is not glued, particularly the suction forces.
The tension direction of the membrane runs from rafter to rafter.
So approximately 60 cm (24 inches), the deflection can also be seen in the photos.
This means whether the membrane is supported only at a "point load" or over a "surface load" makes a significant difference, especially with thin membranes.
The surface loads differ by several times.
The wind forces are definitely relevant if the underlay membrane is not glued, particularly the suction forces.
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