I've posted a couple of times before with speculation on how to insulate under my suspended timber ground floor. Now I've finally taken up half the floorboards in the room I'm starting on (the rest will follow tomorrow). I have 4 x 2 joists crossing the room, supported mid way by a block dwarf wall. There's about 8 inches under the bottom of the joists, above concrete.
I'd planned to suspend space blanket between the joists, on netting, but it's looking a lot simpler to fix sheets of 50mm Celotex under the joists. I have a few air bricks on the two external walls, which are level with the adjacent joists and will need ducting to the underfloor space ( which I could do with a bit of Celotex cratfing).
It seems to be that the masonry in the void will still be vented, and the joists are unlikely to suffer damp from below, due to the foil on the Celotex, nor condensation from moist air above, due to being on the warm side of the insulation.
Can anyone think of anything wrong with this plan?
There is a small prize for the first person to say "notifiable work".
Cheers Richard