Hello,
Our house was built in 1962, and we want to insulate the roof because we need to replace the roof tiles.
It is a rafter roof, where the rafters rest on a ring beam on top of the exterior walls. Around 1984, the eaves were raised, and the roof was covered with boards. On top of these are roofing felt, counter battens, battens, and then the tiles. In the attic, the spaces between the rafters were filled with pumice stones? In the loft space, the spaces are open.
I prefer a roof insulation above the rafters, but I am not sure what we should use instead of roofing felt, i.e., between the boards and insulation. We plan to integrate the loft as a sort of gallery into the attic living area. To keep the roof structure visible, we want to avoid insulation between the rafters.
What materials and assembly would you recommend for the insulation above the rafters? What should I do with the existing pumice stone insulation—remove it partially or completely?
Our house was built in 1962, and we want to insulate the roof because we need to replace the roof tiles.
It is a rafter roof, where the rafters rest on a ring beam on top of the exterior walls. Around 1984, the eaves were raised, and the roof was covered with boards. On top of these are roofing felt, counter battens, battens, and then the tiles. In the attic, the spaces between the rafters were filled with pumice stones? In the loft space, the spaces are open.
I prefer a roof insulation above the rafters, but I am not sure what we should use instead of roofing felt, i.e., between the boards and insulation. We plan to integrate the loft as a sort of gallery into the attic living area. To keep the roof structure visible, we want to avoid insulation between the rafters.
What materials and assembly would you recommend for the insulation above the rafters? What should I do with the existing pumice stone insulation—remove it partially or completely?
N
nordmann-14 May 2009 01:41Hello Andy, adding insulation above the roof deck is a very good idea. There are roof panels with a thickness of 28.9mm (1.14 inches) and a U-value of only 0.10. The cost per square meter is CHF 68.00, and you can install these panels yourself.
B
buidler-131 Mar 2010 09:02I definitely recommend 14cm (5.5 inches) thickness.
M
MODERATOR2 Apr 2010 00:24As a material for roof insulation above the rafters, I suggest using fiber insulation materials (mineral fiber, wood fiber). Rigid foam boards can significantly reduce sound insulation. Depending on the frequency of the sound, they can act similarly to a speaker membrane and noticeably amplify certain frequencies.
Regarding insulation between the rafters, the exact detail would need to be examined to recommend a suitable construction. What is certainly important: this detail must ensure airtightness; otherwise, insulation above the rafters will not be very effective.
Regarding insulation between the rafters, the exact detail would need to be examined to recommend a suitable construction. What is certainly important: this detail must ensure airtightness; otherwise, insulation above the rafters will not be very effective.
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