ᐅ Insulating the top floor ceiling – suggestions? Using PUR boards with a thermal conductivity of 0.024 W/m·K?
Created on: 26 Oct 2011 13:21
R
RolandWHello dear community,
Due to certain circumstances, I have the opportunity to move into a house from 1950 that requires renovation. There will be many different construction tasks to address overall, but I would like to focus on the insulation work first.
Specifically, I would like to insulate the ceiling between the ground floor and the attic. The following information might be helpful:
* Ceiling composition (from bottom to top):
- Plaster, straw mat, counter battens, floorboards, coke ash,
floorboards
* The attic will definitely not be used as living space and does not necessarily need to remain walkable
* Unfortunately, the spacing of the roof beams is not uniform everywhere
* The roof itself is not insulated at all
We have already considered options and are leaning towards using 8 cm (3 inches) thick PUR WLS 024 boards. Possible applications can be seen in the sketch. In this sketch, I created 3 scenarios and evaluated each based on effort (cost, cutting) and efficiency (my presumed air circulation). If this is all nonsense, please let me know and provide suggestions for improvement. Regarding the sketch, red indicates insulation and blue represents drywall or OSB boards.
Furthermore, we are considering wall insulation. Currently, the 38 cm (15 inches) thick walls are simply plastered. In some rooms, we have removed the plaster completely to prepare for future electrical installation and plan to use drywall boards following the example below (either with battens or furring strips). The problem is that an air cavity forms behind the drywall (due to the uneven masonry). An acquaintance told me that air is an excellent insulator (free and with about 0.02 W/mK thermal conductivity, very good). Unfortunately, I lack the professional knowledge to verify this statement. You can find information online indicating that air has low thermal conductivity, but rarely in relation to construction or insulation.
I hope you can understand everything and look forward to your constructive criticism.
Thank you in advance,
Roland
Due to certain circumstances, I have the opportunity to move into a house from 1950 that requires renovation. There will be many different construction tasks to address overall, but I would like to focus on the insulation work first.
Specifically, I would like to insulate the ceiling between the ground floor and the attic. The following information might be helpful:
* Ceiling composition (from bottom to top):
- Plaster, straw mat, counter battens, floorboards, coke ash,
floorboards
* The attic will definitely not be used as living space and does not necessarily need to remain walkable
* Unfortunately, the spacing of the roof beams is not uniform everywhere
* The roof itself is not insulated at all
We have already considered options and are leaning towards using 8 cm (3 inches) thick PUR WLS 024 boards. Possible applications can be seen in the sketch. In this sketch, I created 3 scenarios and evaluated each based on effort (cost, cutting) and efficiency (my presumed air circulation). If this is all nonsense, please let me know and provide suggestions for improvement. Regarding the sketch, red indicates insulation and blue represents drywall or OSB boards.
Furthermore, we are considering wall insulation. Currently, the 38 cm (15 inches) thick walls are simply plastered. In some rooms, we have removed the plaster completely to prepare for future electrical installation and plan to use drywall boards following the example below (either with battens or furring strips). The problem is that an air cavity forms behind the drywall (due to the uneven masonry). An acquaintance told me that air is an excellent insulator (free and with about 0.02 W/mK thermal conductivity, very good). Unfortunately, I lack the professional knowledge to verify this statement. You can find information online indicating that air has low thermal conductivity, but rarely in relation to construction or insulation.
I hope you can understand everything and look forward to your constructive criticism.
Thank you in advance,
Roland
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