Spray foam insulation in the attic floor non vented attic spaces in this application considered the most effective by most of the spf industry the foam is sprayed directly to the underside of the roof between the joists down around the rim and into the soffit areas on the gable wall ends and effectively sealing off and insulating the entire attic space from any air infiltration.
Attic insulation rafters or joists.
They are nominally 2 inches thick actual width usually 1 1 2 inches and come in a variety of widths from 8 to 12 inches.
The batting material must be faced and.
Joists are traditionally made from timber.
1a attic access door.
You can use rigid foam panels or do as tom silva does with nearly all houses these days.
Either batting or blown insulation works in attics.
The technically correct approach depends on a number of factors.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.
When unrolled batting assumes its loft or thickness.
Joists are the parallel horizontal beams that run across an open space joining opposite walls in a building to support both the ceiling below and the floor above.
Insulating attic floors unfinished or uninsulated attics need a layer of protection against air migration.
Install batting between the attic s floor joists.
In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.
Batting comes in rolls and is sized to fit between rafters or joists.
For a correct approach an inner roof lining is required.
If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space.
Whether or not there is an inner roof lining and the total thickness of the roof structure.
If your attic is often used or perhaps you plan to convert it in the future you will need to insulate the inner surfaces of the roof.
Hire a pro to install spray foam insulation.