Malkie

Had an insulated garage door fitted last year and that makes quite a difference and also the floor is painted. Even on the coldest day it never is freezing in there and the heating in the room below is turned down if not in use.

House was built in mid eighties by the way. Timber frame construction with brick / roughcast finish

So yes this is a family room under the garage. The garage is integrated into the house and there is no room above it only the roof which is insulated. The front of the room is underground and there is really only one external wall, one internal wall and the other backs onto a stair that provides access to the upper floor. The room is useable and heated as required by the central heating. The issue is it cools quickly and I want to improve the comfort levels if possible. I am pretty certain there is no insulation in the existing ceiling. Just plasterboard and a 50mm gap to the underside of the garage floor. No obvious way to provide ventilation

My house is split level and I have a room built under the garage floor. The floor of the garage is concrete screed on bison beams. The ceiling in the room below is plasterboard on 50mm wooden struts and there is no evidence of any insulation but also no damp. This is a cold room and I was planning to use PIR boards to improve the ceiling insulation but have been advised that is not a good idea without air flow through the gap below the concrete and there is none. Any ideas?