Unvented Roof Soffit

An unvented roof is often the only viable option when roof framing is complicated such as when there are hips valleys dormers or skylights that would prevent eave to ridge ventilation.

Unvented roof soffit.

Or when adding eave vents would clash with the house s architectural style. Unvented roofs also. A properly functioning un vented roof. Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction.

Windstorms for example can cause vented soffits to collapse creating excessive pressure which may lead to window blowout and roof loss. In an un vented roof foam can serve as the air barrier and vapor retarder and prevent moisture from getting in to the roof cavities. Unvented roofs have a number of advantages. Like a wall that is severely out of plumb an unvented roof has insulation packed into the framing cavities aligned with the sheathing.

Smartside 23 938 in x 191 875 in 38 series primed wood vented soffit. Because the attic space is now inside the thermal envelope blowing a little heat up there is not like throwing twenty dollar bills out the window. Item 88997 model xsss25824. Ventilation becomes more difficult the more complicated a roof s construction is.

These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. This document provides a brief description of different types of unvented roof assemblies and the benefits of unvented roof construction.