Insulate Attic Roof Rafters

That s because it s easier for the contractor to spray than clean up existing insulation deal with any can lights or venting etc.

Insulate attic roof rafters.

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. Make sure it is flush against the wood as also a 1 inch gap can create a 20 percent heating loss. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Once the insulation is in place between all the rafters staple up a vapor barrier of 6 ml.

If there is a floor you will need to remove it to properly insulate the roof rafters. In order to avoid damage to the roof deck you should insulate ceilings to create an air barrier between the living space and an unfinished attic or airspace underneath the roof deck. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4.

Although the paper or foil backing of the insulation is a vapor barrier the added visquine covers completely with no breaks making sure no moisture forms in the cavity. If your attic is going to be converted into livable space then you will need to insulate the roof rafters. For rolled insulation location it in between roof covering rafters. If you re not do the attic floor.

If the plastic sheeting is in pieces overlap the pieces by 8 inches and staple it in place directly to the roof rafters and the wall. The technically correct approach depends on a number of factors. Hire a pro to install spray foam insulation. Consumers are often told by spray foam contractors to do the rafters.

Visquine a painter s drop cloth over the insulation and across the face of the rafters. Place the plastic sheeting on top of the rolled insulation. You can use rigid foam panels or do as tom silva does with nearly all houses these days. Do not use plastic sheeting in this case.

Attic moisture problems are often the result of heated air from the living space rising up into the attic which is not heated. If you re using the attic for living space then you need to insulate the rafters. Whether or not there is an inner roof lining and the total thickness of the roof structure.