Hi All; We need to insulate the timber joist floor rooms which have curved bay window radiators as part of renovation. While looking for insulation boards, I came across these between joist UFH solutions: https://www.theunderfloorheatingsto...eating-for-between-joists-or-suspended-floors I would like to get your advice and opinions on: - the "spreader plate" and "foil board" solutions seems easier to install but I wonder how efficient they are as there is no "thermal storage" screed.