Insulating Floor Above Garage

The best way to insulate a slab is to isolate it from the ground and the air around it by insulating under the slab and around its edges.

Insulating floor above garage. To be clear we re talking about specific types of insulation that you install inside your walls not the kind of insulation that you install on the outside of your house. The options you have for the room in general are fiberglass batts blown in cellulose blown in cellulose injection foam and spray foam. Air seal rim joists and any holes in the top plate of the garage walls.

Seal all seams gaps and holes in the subfloor air barrier with caulk or foam. That s not always possible especially in existing. Floor above a garage smaller room over a large garage insulate ducts and plumbing and put them close to the floor if hvac ducts are routed through the floor assembly the floor joists must be deep enough to install several inches of insulation under the ducts.

When you have a room above the garage the floor rests on boards supported by joists. This can be done through blown in insulation and unfaced or faced batt insulation. An insulated floor can make a garage much more comfortable to work in during cold weather.

To insulate the floor of the room above the garage seal the space between the floor of the room and the ceiling of the garage and the top plate and the header joist with insulation. Your garage is inside your house so you should use interior insulation. If you have a conditioned room over your garage it would be a good idea to insulate the garage ceiling if it s easily accessible.

But since it s a floor to the room insulating it won t have as much of an effect as the room s ceiling. You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring. Air seal the floor above a garage when there is living space above the garage and make sure floor insulation is in full contact with the underside of the subfloor.

A garage attic also should be insulated is if there is an air conditioned room above the garage. If the joists are 10 inches deep the cavity can take high density r 30 insulation which is 8 1 2 inches thick more than enough for floor insulation. The best way to insulate the finished room over the garage is going to be just like any other room in your house insulate the exterior walls the ceiling or attic and the floor.