BRITS are losing millions of pounds – and even risking their lives – amid warnings that 55% have insulation based on ...

Cons: Foam board insulation can be harder to install snugly ... insulation between the joists that run along an unfinished floor. You can even add more on top of what’s there.

But there is a way around this: Insulate between the joists with mineral wool, lay rigid insulation boards on top and wooden floor boarding on top of that. You can buy insulation board that's been pre ...

The drawing shows how to install a wide board for the eaves to accomplish ... thing I see where people try to install batt insulation between the floor joists from underneath.