WE had a new garage built with a room on top 3 years ago. The lads put insulation in the floor, walls garage ceiling/bedroom floor and roof. They used some stuff I'd never seen before... it's like a big slab of foam covered with tinfoil! Even with that in every wall and floor it's still the coldest room in the house, but tbh I've always put that down the the fact it's 35ft x 12ft.
Also, I'd always take up the floorboards. It's got to be easier to work with gravity than against it!
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