Insulate Attic Roof Rafters

For a correct approach an inner roof lining is required.

Insulate attic 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. If you re not do the attic floor. 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. Hire a pro to install spray foam insulation.

If your attic is going to be converted into livable space then you will need to insulate the roof rafters. Visquine a painter s drop cloth over the insulation and across the face of the rafters. Make sure it is flush against the wood as also a 1 inch gap can create a 20 percent heating loss. You can use rigid foam panels or do as tom silva does with nearly all houses these days.

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. 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. The technically correct approach depends on a number of factors.

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. Do not use plastic sheeting in this case. If you re using the attic for living space then you need to insulate the rafters. For rolled insulation location it in between roof covering rafters.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. 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. Usually you will certainly fill the insulation blower with the insulation and blow it between the attic floor joists. 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.

Place the plastic sheeting on top of the rolled insulation. That s because it s easier for the contractor to spray than clean up existing insulation deal with any can lights or venting etc. Consumers are often told by spray foam contractors to do the rafters.