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Hi, any advice would be great.
We had a leak coming in our bathroom that sits inside the rear dormer under a flat roof the roof, felt has been replaced & leak was sorted.
I now need to replace the bathroom ceiling, it's a small room 2x2.5 m, if it was a bigger room I would get a contractor in. I would like to improve the insulation.
The house is late 60s to early 70s, Chalet style semi-detached with full length from and rear dormers. About half of the ceiling of the upstairs rooms 3 x bedrooms and a bathroom is under the flat roof, the rest is under the loft space.
I have concerns about if this is a cold or warm roof design.
Above the bathroom ceiling, there is an empty 120mm void between the joists/rafters. Above the joists, there is a layer of fibre insulation (1-2 cm thick) encased in weed-control-type material or maybe its vapour barrier. Directly above this is the flat roof deck. There are no obvious vents.
Can I fill this 120mm void ( leaving now empty space) between the ceiling and the 1-2 cm thick insulation under the deck with insulation boards then fit the new plasterboard?
Should I fit external vents and use 70mm of insulation board, leaving a 50mm void that can vent into loft space, then replace the plasterboard?
Should I use wool-based insulation?
Anything else i should do?
We had a leak coming in our bathroom that sits inside the rear dormer under a flat roof the roof, felt has been replaced & leak was sorted.
I now need to replace the bathroom ceiling, it's a small room 2x2.5 m, if it was a bigger room I would get a contractor in. I would like to improve the insulation.
The house is late 60s to early 70s, Chalet style semi-detached with full length from and rear dormers. About half of the ceiling of the upstairs rooms 3 x bedrooms and a bathroom is under the flat roof, the rest is under the loft space.
I have concerns about if this is a cold or warm roof design.
Above the bathroom ceiling, there is an empty 120mm void between the joists/rafters. Above the joists, there is a layer of fibre insulation (1-2 cm thick) encased in weed-control-type material or maybe its vapour barrier. Directly above this is the flat roof deck. There are no obvious vents.
Can I fill this 120mm void ( leaving now empty space) between the ceiling and the 1-2 cm thick insulation under the deck with insulation boards then fit the new plasterboard?
Should I fit external vents and use 70mm of insulation board, leaving a 50mm void that can vent into loft space, then replace the plasterboard?
Should I use wool-based insulation?
Anything else i should do?
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