If the area of the heated bonus room above the garage is smaller than the area of the garage ceiling you ll need to install blocking between the joists to provide an air barrier where the floor insulation stops.
How to insulate the floor of a add on room.
If it is above grade winter drafts will make the room too cold to use no matter how well the walls and ceiling are insulated.
Ensure you insulate thoroughly but avoid squashing insulation material as this will seriously compromise its effectiveness.
But if you want the absolute best insulation value there is no approach to insulating a bonus room that tops spray foam insulation.
And yes there are health concern issues associated with it.
This needs to be done before a fitted carpet is laid as it will not be possible afterwards.
Insulating the floor is an important step in porch conversion.
Locate the blocking under the kneewalls.
Remember to seal all the gaps between the skirting board and the floor to prevent draughts.
If your walls need insulation it may involve a bigger project of adding new sheetrock over insulation or having it blown into the walls.
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The job of insulating the floor is easier if there is room to crawl underneath but if there isn t it can still be done.
Best option insulate your bonus room with spray foam.
When insulating a bonus room floor you ll usually be working from below.