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Conversions

Dormer Bungalow - Insulation/Sound Proofing

Anonymous user 23/02/2024 - 3.28 PM

1950s Bungalow with a Dormer conversion done in approx. the 1980s. Get a fair bit of traffic noise from the sloping roofs in the Dormer areas. Plaster boarded with wallpaper. I assume there is no insulation behind this. The roof rafters are 75cm/3". What would be the best type of insulation I can do to prevent heat loss and sound proof? I believe a 25 mm gap will need to be left between the rafters and any insulation installed, is this correct? If so, I will then only have 50mm of area I will be able to insulate with celotex/Kingspan. Would I then need to add insulation from the inside in say 50mm of insulated plaster board? Also, I have heard of Trico Super 10, is this product any good? Thank you.

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4 Answers

Blue Sky Property Services

Rating: 5 out of 5

Great Yarmouth

Hello .....firstly...triso not trico....! There is a little bit of smoke and mirrors with this product!! Clearly, it is not as good as thicker insulation products in all situations else no one would be struggling with 150mm 'celotex' and super long plaster board screws! It is great as an insulator against directly radiated heat so if your problem was purely sunshine on the dormers I woukd say yes! However with your soundproblem I would,without seeing your actual situation, leave a 25mm airgap, then 50mm sound insulating rockwool then 15mm soundbloc plasterboard. And remember sound is like water and will find its way through any gaps... So do the job thoroughly! Good luck!!

Answered30 December 2019

Anonymous user

Use the triaso super 10+

Answered30 December 2019

Building

Rating: 4.4 out of 5

Swansea

Best thing to do on my opinion is to leave that 3" gap between the rafters for air breathing.2.5 mill I think is not enough. I would use 75 mill celotex insulation on top of the rafters and boarded over with standard plasterboard and skim. That's all.

Answered1 January 2020

T X L Building Services

Rating: 5 out of 5

Ambleside

I would also tape the joints and rafters to insulation ideally a bigger air gap would be nice but if not possible then 25mm will suffice

Answered26 January 2020