I am having problems with the insulation in a garage conversion that was completed at the end of last year. The house is a modern timber frame house with an internal garage that has now been converted to a family room. The garage has been insulated with kingspan insulation behind the plaster board, but due to vents in the eves there is a bad draft in the 1" gap between the plasterboard and the kingspan. The draft can be felt at power sockets or when the plasterboard is cut.
I am looking for suggestions on the best way to fix this problem. If possible I'd prefer not to remove all the plasterboard, but will do if necessary.
Can I get something to fill the gap between the insulation and the plasterboard? Or do I need to remove the plasterboard, plug the gaps, and re-plaster/re-decorate the room?
This is a peranial fault, the insulation should have been glued to the walls and the insulation wet plastered. Celotex make an ideal product.
The best bet is to remove the plasterboard and glue the insulation to the walls making sure you fill ever tiny hole then fill the remaining gap with more insulation or plaster, then instal a plastic damp proof membrane, to stop the indoors water vapour getting into the wall and rotting the wood.
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