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- 2 Jun 2004
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I am looking to insulate a pitched roof above a bedroom in a 1930's house.
The construction is tiles on battens, no sarking, 100mm rafters and lathe and plaster.
The section is 1.3m long and I can get access to the 1.3m long letter box from both the loft and the eaves. The problem is the gap between the rafters are now even all the way up.
I need to leave 50mm gap below the roof tiles for ventilation, so its a question of how to insulate the remaining 50mm
I have tried with 50mm rigid board, but even with the most square rafters the are gaps at the edges.
So unless anyone else has any ideas my options are;
- insulate with rigid board but have large gaps at rafters, bodge job
- use a 50mm wool that will compress into the uneven ratfer gaps (if 50mm is available).
- remove the lathe and plaster ceiling create a increasd rafter thickness to 150 mm and insert 100mm rigid insulation, and plasterboard over.
Thoughts
WN
The construction is tiles on battens, no sarking, 100mm rafters and lathe and plaster.
The section is 1.3m long and I can get access to the 1.3m long letter box from both the loft and the eaves. The problem is the gap between the rafters are now even all the way up.
I need to leave 50mm gap below the roof tiles for ventilation, so its a question of how to insulate the remaining 50mm
I have tried with 50mm rigid board, but even with the most square rafters the are gaps at the edges.
So unless anyone else has any ideas my options are;
- insulate with rigid board but have large gaps at rafters, bodge job
- use a 50mm wool that will compress into the uneven ratfer gaps (if 50mm is available).
- remove the lathe and plaster ceiling create a increasd rafter thickness to 150 mm and insert 100mm rigid insulation, and plasterboard over.
Thoughts
WN