Insulate Rafters Or Ceiling

Garages built without attics are also prime candidates for insulation.

Insulate rafters or ceiling.

Cathedral ceilings must provide space between the roof deck and home s ceiling for adequate insulation and ventilation. Apply insulation between rafters when finishing an attic into a heated room or when building a cathedral ceiling in the home. Home ceilings are usually insulated in order to seal off the extreme temperatures in your attic. This type of ceiling is insulated in the same manner that you would insulate a standard attic space.

Stop using your attic for storage. Because the simplest and cheapest way to insulate an attic is to add material to the floor. Place the insulation between the rafters or below them. This can be achieved through the use of truss joists scissor truss framing or sufficiently large rafters.

For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation. If you have to insulate around electrical boxes or cables then support from an electrician might be needed as part of the process too. Do no use a vapor barrier under the. Use closed cell spray foam closed cell foam board extruded polystyrene such as dow styrofoam or foil faced iso board.

Seal the insulation or the ceiling surface below against air leakage. You don t want moist air leaking into the roof cavity.