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
Knallkörper29 Apr 2018 07:37If these boards are vapor-permeable (with an sd-value about 10 times lower than your vapor retarder), then it could work. However, it probably won’t be cost-effective, and you likely won’t notice any difference. I would screw tongue-and-groove boards onto the collar beams.
M
Mastermind129 Apr 2018 09:49From my own experience, I can say that a photovoltaic system has a positive effect on summer temperatures. (We have a timber frame house built to KfW 60 standards from 2009, with roof insulation made of wood fiber insulation boards and mineral wool insulation on the inside).
Since we sleep directly under the roof, we have noticed the photovoltaic system helps with summer heat protection.
On our house, the south-facing roof is completely covered with photovoltaic panels, and the east-facing roof is partially covered.
If photovoltaic systems are an option, they can reduce indoor temperatures by a few degrees in summer :-) and also generate electricity.
Since we sleep directly under the roof, we have noticed the photovoltaic system helps with summer heat protection.
On our house, the south-facing roof is completely covered with photovoltaic panels, and the east-facing roof is partially covered.
If photovoltaic systems are an option, they can reduce indoor temperatures by a few degrees in summer :-) and also generate electricity.
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