Loft insulation advice required

22 Feb 2006
Reaction score
United Kingdom
Hi I wish to insulate my loft floor and partially board it. At present it has a measly 50mm of insulation. The joists are 90mm deep and I plan to raise the joists to 180mm in the area I plan to board by fixing another 90mm deep beam ontop of the exiting joist.
My question is... Do I need an air gap between the top of the insulation and the loft boarding, ie 150mm deep insulation leaving an air gap of 30mm. Or can I install 200mm deep insulation in the loft and only compact it to 180mm in the are that is boarded?

Sponsored Links
Hi Static, cheers for the advice, will do. But do i need an air gap between the insulation and the loft board? :?:


DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links