I am considering converting an old single storey extension into a kitchen.
Only problem is the walls are single brick thickness. I was looking at using 30mm cavity wall boards to insulate. They are supposed to give a U value of 0.35, so is there any need for a cavity between the boards and the brickwork?
If so how large a cavity is sufficient?
Gratefully
Only problem is the walls are single brick thickness. I was looking at using 30mm cavity wall boards to insulate. They are supposed to give a U value of 0.35, so is there any need for a cavity between the boards and the brickwork?
If so how large a cavity is sufficient?
Gratefully