Hello everyone,
we are planning to build our new house using timber frame construction.
At the moment, I am focusing on insulation for the roof, considering both summer heat protection and winter thermal insulation. I am looking for ways to optimize or find the ideal balance between the two.
The current planned build-up is as follows:
- Clay roof tiles
- Counter battens and main battens
- Vapor-permeable underlay membrane
- Roof structure (rafters)
- Thermal and acoustic insulation between rafters and collar beams within the thermal envelope (240 mm (9.5 inches), thermal conductivity class 035)
- Vapor control layer
- Substructure (battens)
- Gypsum board (GKF 12.5 mm (0.5 inches))
The attic space will not be insulated but finished within the thermal envelope.
I am wondering whether increasing the thermal conductivity class of the mineral wool from 035 to 032 would improve summer heat protection. Or would it be better to increase the thickness from 240 mm (9.5 inches) to, for example, 280 mm (11 inches) of mineral wool? Alternatively, should I consider a different insulation material?
What are your thoughts or experiences on this?
Thank you very much
Best regards
Sky
we are planning to build our new house using timber frame construction.
At the moment, I am focusing on insulation for the roof, considering both summer heat protection and winter thermal insulation. I am looking for ways to optimize or find the ideal balance between the two.
The current planned build-up is as follows:
- Clay roof tiles
- Counter battens and main battens
- Vapor-permeable underlay membrane
- Roof structure (rafters)
- Thermal and acoustic insulation between rafters and collar beams within the thermal envelope (240 mm (9.5 inches), thermal conductivity class 035)
- Vapor control layer
- Substructure (battens)
- Gypsum board (GKF 12.5 mm (0.5 inches))
The attic space will not be insulated but finished within the thermal envelope.
I am wondering whether increasing the thermal conductivity class of the mineral wool from 035 to 032 would improve summer heat protection. Or would it be better to increase the thickness from 240 mm (9.5 inches) to, for example, 280 mm (11 inches) of mineral wool? Alternatively, should I consider a different insulation material?
What are your thoughts or experiences on this?
Thank you very much
Best regards
Sky
K
Knallkörper15 Apr 2018 18:12Roof insulation with wood fiber boards would definitely help. If that is too expensive, insulating beneath the rafters on the room side is the second-best option.
We have 240mm 035 cavity insulation and an additional 60mm 035 insulation beneath the rafters. However, the insulation beneath the rafters mainly serves to reduce thermal bridging caused by the rafters. Overall, it might actually be almost excessive.
Even at -12°C (10°F), heating was hardly necessary on the upper floor. Now, with the first temperatures above 10°C (50°F), and since the roof window shading is not yet installed, it feels almost like being roasted—heat no longer escapes naturally.
Therefore, my advice is to leave it as it is and invest more in sun protection.
Even at -12°C (10°F), heating was hardly necessary on the upper floor. Now, with the first temperatures above 10°C (50°F), and since the roof window shading is not yet installed, it feels almost like being roasted—heat no longer escapes naturally.
Therefore, my advice is to leave it as it is and invest more in sun protection.
What do you think about insulating the top floor ceiling, above the specified construction with cavity insulation made of mineral wool WLG 035, of the collar beam ceiling with an additional layer of SteicoTop wood fiber insulation on top?
Is this easily feasible? Could there be issues with moisture affecting the mineral wool or something similar? In other words, is this construction sensible, doable, and compatible?
The advantage would be that the attic would at least be temporarily walkable.
Is this easily feasible? Could there be issues with moisture affecting the mineral wool or something similar? In other words, is this construction sensible, doable, and compatible?
The advantage would be that the attic would at least be temporarily walkable.
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