Because the simplest and cheapest way to insulate an attic is to add material to the floor.
Insulate rafters or ceiling.
If your attic is usable space but not lived in then you won t need to insulate the roof rafters as long as the ceiling floor that separates the roof from your living area below is insulated.
Do no use a vapor barrier under the.
Apply insulation between rafters when finishing an attic into a heated room or when building a cathedral ceiling in the home.
Insulate a cathedral ceiling by ensuring there is no opportunity for drafts to get into the room.
Start with the attic floor.
If you don t have an attic however there is.
Seal the insulation or the ceiling surface below against air leakage.
Seal all ceiling openings.
This type of ceiling is insulated in the same manner that you would insulate a standard attic space.
Check the joists and wall plates for any holes or openings.
For rolled insulation place it between roof rafters.
Place the insulation between the rafters or below them.
Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss.
This ceiling type involves the installation of a ceiling that is not attached directly to the roof rafters.
Cathedral ceilings must provide space between the roof deck and home s ceiling for adequate insulation and ventilation.
Home ceilings are usually insulated in order to seal off the extreme temperatures in your attic.
One option as part of a home remodel is to leave the roof rafters exposed by not installing a ceiling.
One drawback to this is that the layer of insulation placed above the ceiling is missing which can subject the area of the house with the exposed rafters to extreme temperature changes.
If you have an attic there are quick ways to insulate the ceiling from above after drywalling it.
You don t want moist air leaking into the roof cavity.
Stand on a ladder and using a caulk gun seal any areas where there is visible wiring or plumbing.
Stop using your attic for storage.
Use closed cell spray foam closed cell foam board extruded polystyrene such as dow styrofoam or foil faced iso board.
This can give the house a more rugged open feeling.
How to put insulation in a ceiling before drywall.
Garages built without attics are also prime candidates for insulation.
If you have to insulate around electrical boxes or cables then support from an electrician might be needed as part of the process too.