Adding height to the loft floor - for extra insulation

10 May 2011
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United Kingdom
Hi all,

I was wondering if you could help. I've currently got just the roof joists in the loft, approx 100mm deep, and insulation laid between the joists.

Some of the loft has been boarded out for storage, however I'd like to add extra insulation, to save some cash on the gas bill, but also retain the boarding for storage.

At the moment the two schools of thought are, screw some extra lengths of 2by4 (either allong or across) the existing joists, fill in the gaps with insulation, and place the flooring on them.

Or get the loft insluation legs (see and place the flooring over the top of them.

Any advice? Anyone used those loft insulation legs before?
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do not go for legs they increase point loading and increase the unsupported span by around 40%

go for 4x2 at right angles and concentrate the loads over any areas with walls underneath

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