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Understood RE binders. I want to beef up insulation to 27cm as a minimum (to match the rest I have added to the loft). I want to add boarding on top to take light storage xmas decks etc (which are already up on the existing structure in all fairness). I have lapped sarking felt and enough...

By between, I assume you mean fixed on top as described by Tony1851? Sounds like a lot of weight, what timber did you use?

Thanks, @RandonGrinch The advice makes sense, but how does the 4" on timber (or 10cm) allow for 17cm of insulation plus an air gap between insulation and boards?

Thanks @blurp That's a good point RE warping I hadn't given that enough consideration. The loft was boarded out in this way when we moved in and it's a bit more than x mas decorations, although have reduced clutter by a lot recently. Should the cls battons you suggest cover the full span...

Hello all, Currently part of my loft floor is boarded with only 10cm of insulation underneath. The rafters are 7.5cm deep so insulation in this area is compressed. I have enough off cuts of fence posts and enough gravel kick boards in garage to cut up and create a structure to support the...