I'm going to reinsulate my roof space during the current project to board the loft out for light storage.
I know that the recommended depth of the final insulation is 270mm with two layers of insulation laid both ways, but with my strengthened floor joists (new 3x2s on top of existing 3x2 joists, hung at each end from 6x2 purlins) the depth is going to be 150mm, ie 75mm (3") x 2 and then with the loft boards on top.
What sort of insulation do I put down? Just top layer, just bottom layer, two layers on top of each other under the boards, what thickness etc?
What should I be doing for a boarded scenario?
I know that the recommended depth of the final insulation is 270mm with two layers of insulation laid both ways, but with my strengthened floor joists (new 3x2s on top of existing 3x2 joists, hung at each end from 6x2 purlins) the depth is going to be 150mm, ie 75mm (3") x 2 and then with the loft boards on top.
What sort of insulation do I put down? Just top layer, just bottom layer, two layers on top of each other under the boards, what thickness etc?
What should I be doing for a boarded scenario?