Friend lives in a garage apartment, over the garage. They are thinking of expanding into both floors. Creating inside stairs, kitchen on first floor, bedrooms on 2nd, etc. Would double their available living space.
The garage of course has a concrete floor. It's been suggested that they place a layer of 2 inch foam board down and then place 2 x 4 sleepers with a plywwod floor screwed to the sleepers.
Anyone have any experience with this? Appreciate opinions pro or con. Thanks1