Hi,
I live in a fairly modern house (2001) with standard loft insulation laid between the joists and overlapped at 90 deg.
I'd like to board out part of the loft for light storage. I've read that one common approach would be to install new 4" x 2" joists at 90 deg to the existing and board on top. However, the existing joists are only 3" high and although the existing insulation could be compressed to fit between the existing and new joists, I would be far off the recommended 270mm depth of insulation.
One option I was thinking about was to leave the existing insulation between the 3" existing joists and continue to install new 4" joists. However, I could then install either 75mm or 100mm (tight fit) Celotex between these joists. The improved thermal performance of the Celotex, together with the chipboard, should keep the boarded space R-Value similar to that of 270mm of mineral wool insulation.
I'd be grateful of any thoughts on whether the above will work, or any better ideas for my situation.
Many thanks,
Damian
I live in a fairly modern house (2001) with standard loft insulation laid between the joists and overlapped at 90 deg.
I'd like to board out part of the loft for light storage. I've read that one common approach would be to install new 4" x 2" joists at 90 deg to the existing and board on top. However, the existing joists are only 3" high and although the existing insulation could be compressed to fit between the existing and new joists, I would be far off the recommended 270mm depth of insulation.
One option I was thinking about was to leave the existing insulation between the 3" existing joists and continue to install new 4" joists. However, I could then install either 75mm or 100mm (tight fit) Celotex between these joists. The improved thermal performance of the Celotex, together with the chipboard, should keep the boarded space R-Value similar to that of 270mm of mineral wool insulation.
I'd be grateful of any thoughts on whether the above will work, or any better ideas for my situation.
Many thanks,
Damian