loftzone

Is it possible to board a loft that has 400mm of insulation? The joists are 120mm high. LoftZone would raise the boards to 404mm, leaving only a 4mm air gap instead of 50mm. Loft Leg XL would raise it to 425mm, leaving only a 25mm air gap. Could I put a block of wood between the joists and...

Hi all, just want to clarify before going ahead and because i never seem to have this kind of luck but i'm looking to extend my loft hatch and luckily the existing hatch sits between the two joists and only need to remove the existing frame/noggin and cutout plasterboard, just wanted to see...