Revisions log for Answer #1994

We just recently insulated our upstairs ceiling. Lined with foil, glued overlaps, glued strips of insulation around the edges of the floor, then laid one layer of polystyrene horizontally, one vertically and put OSB boards on top, tongue and groove glued. A total of $1,200. We had 50 square meters.

All you need are two stompboards to cut the boards, a miter saw, a pencil and a meter.