This diy solution would helps a homeowner solve a common problem in many homes which is cold hot floors in the rooms above the garage.
Insulating ceiling in garage with room above.
This can be done through blown in insulation and unfaced or faced batt insulation.
This is due to uncond.
If you are insulating the garage ceiling not only by the truss level but also up by the roofline then you must leave at least 1 1 2 to two inches of air between the fiberglass and the underside.
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.
Mark robinson jan 14 11 at 15 26.
This should be done purely by insulating below the ceiling of the garage or the floor of the upper room.
An open stairwell leads from the first floor has a door at the first floor level to the room over the garage.
Make sure you have enough ventilation on your roof as well.
The unfinished room has plywood flooring and batt insulation separating it from the garage.
Exterior walls if your exterior walls are constructed from 2 by 4 inch studs the most insulation that can go into the wall while retaining its r value is r 13 or r 15 as these are both made to fit a cavity 3 1 2 inches deep.
The rest of the attic has blown in cellulose insulation but is not floored except for a small storage area.
But if the garage is heated you should definitely insulate.
Insulate the garage s ceiling by using the recommended r value for your area as advised by the department of energy s oak ridge laboratory.