My bathroom has a flat roof. I have removed the old ceiling and would like to install the new ceiling with some sort of insulation. There are 6'' joists supporting the roof, is it possible to fit say 2'' of insulation directly above the new ceiling thus leaving a 4'' void or am I at risk of condensation forming?
Insulating a flat roof
- Thread starter JPWard
- Start date
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You can use 4" insulation leaving 2" air gap, if there's no ventilation via soffit area, then best to put some in, screwfix sell the circulation fascia/soffit vents with the hole cutter drill bit. You may also find it easier to use insulation slabs instead of roll type in between ceiling joists. Sliver foil backing plasterboards helps to reflect heat loss and moisture resistance above
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why don't you full fill and take the air gap out of the equation?
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