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If I have 100mm fiberglass which will be compressed a bit as the joist are only 85mm what thickness of celotex would you recommend

Didn’t want to have such a large gap between the insulation and boards to max height plus mixed reviews on them warping out of shape

Hi I’m currently adding an extra 200mm of loft insulation to the 100mm already down to give me 300mm advised. I want to have a section in the middle boarded out, I’m reusing boards already down. My existing joists are only 85mm deep so I need to raise c215mm to clear the new insulation. Loft...

Hi, looking for some advice please on insulating a plasterboard finished wall which backs into the loft from an extension I’m adding loft roll over existing insulation which is fine. But I’ve noticed that the extension we had built which has vaulted ceiling, the top of the wall backs into the...