Attic Insulation Rafters Or Joists

The batting material must be faced and.

Attic insulation rafters or joists. You can use rigid foam panels or do as tom silva does with nearly all houses these days. Hire a pro to install spray foam insulation. Either batting or blown insulation works in attics. 1a attic access door.

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. 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. Whether or not there is an inner roof lining and the total thickness of the roof structure.

If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space. The technically correct approach depends on a number of factors. 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. Insulating attic floors unfinished or uninsulated attics need a layer of protection against air migration.

For a correct approach an inner roof lining is required. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Install batting between the attic s floor joists. Joists are traditionally made from timber.

In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials.