Spray Foam Insulation On Roof Rafters

Open cell and closed cell.

Spray foam insulation on roof rafters.

Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing. Serving as both an air sealant and an insulator spray foam is estimated to reduce the standard hvac sizing by about 35 on average. According to the us environmental protection agency epa spray foam is recognized as a premier alternative to the batt insulation of years past. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Lstiburek takes blame for bad language. There are two types of spray foam. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls.

Rigid foam and spray foam are two of them. However there are still some issues with spray foam insulation on the roof that can be avoided. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. We install thermofoam our high performance spray foam insulation between the rafters of your roof to provide an airtight thermal seal of your home.

This minimises the issue of cold air meeting warm air. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof. Poor ventilation equals condensation. If you d like to start saving money and time today buy foam it green spray foam insulation now or call us at 800 516 0949.

In the case of spray foam insulation it is applied to the roof rafters balancing the temperature in the loft with the rest of the house. Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space. The later is used in new construction as the interior board serves as an inner wall. Your new warm roof system prevents heat that you generate during the winter from escaping from your home creating a single ambient environment.

All insulation materials require proper venting. 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. It typically has 3 variations. 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.