Hi all, hope you can help. I live in a 1930's semi with floorboards downstairs. I am about too sand the floorboards, but the room is cold all year round, as it gets no sunshine. And im thinking that it we be even colder with the floorboards sanded. What is the best method of insulating from beneath the boards. I have seen these plasic/insulating membraines, that come in a roll, could they be fixed to the joists. Thanks for any advice