Insulating Unvented Attics With Spray Foam

An alternate to spray foam insulation in an unvented attic is plenum trusses which allow you create a reverse bulkhead above the ceiling plane that is insulated.

Insulating unvented attics with spray foam.

Over time feedback from builders and building owners has been and continues to be overwhelmingly positive especially in the areas of moisture performance energy efficiency and building durability. Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation. Foam insulation above the roof deck to keep its temperature above 45 f throughout the year or spray foam insulation under the roof deck to keep interior moist air from contacting it. Spray foam insulation in an unvented attic assembly has been one of the most researched and widely implemented innovations of recent years.

Both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness. How to insulate my attic and preparing for winter. Spray foam in unvented attics intended for regular use helps. Closed cell spray foam can be used in any climate.

How to install spray foam under the roof deck in a cathedral ceiling it is recommended that the spray foam insulation is installed by a licensed professional applicator. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Using spray foam insulation in an unvented attic application. In comparison to high density spray foam medium density spray foam is applied as a low or high pressure two component polyurethane spray foam.

Unvented cathedralized attic detail with air impermeable spray foam insulation installed to the underside of the roof deck. The evaluation service report esr for spray foam insulation products provides a valuable resource based on a third. Generally any attic insulation project is going to cost between 2 50 to 3 50 per square foot insulating attic roof with spray foam insulation will save money types of attic spray foam insulation open cell closed cell how to insulate an attic roof rafters when properly installed either type of spray foam insulation will act as a. Spray foam in unvented attics spray foam in unvented attics allows homeowners to convert the area into a liveable space.

The trusses do cost more but this added expense can be mitigated by a. This allows you to install your bulkheads above the ceiling plane without the need for spray foam insulation. Unvented attics sometimes called sealed enclosed or encapsulated attics feature insulation on the underside of the roof decking rather than on the attic floor. The unvented attic space is considered the most effective and up to date building practice particularly by the spray foam industry.