Unvented Roof Soffit

The insulation can go below the roof deck above the roof deck or both.

Unvented roof soffit. These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. 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. Ventilation becomes more difficult the more complicated a roof s construction is. Foam and the roof assembly foam insulation can play an important role in both vented and un vented roof assemblies.

When the house has no soffits and hence no soffit vents. Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. A properly functioning un vented roof. Like a wall that is severely out of plumb an unvented roof has insulation packed into the framing cavities aligned with the sheathing.

Windstorms for example can cause vented soffits to collapse creating excessive pressure which may lead to window blowout and roof loss. Smartside 23 938 in x 191 875 in 38 series primed wood vented soffit. Item 88997 model xsss25824. Or when adding eave vents would clash with the house s architectural style.

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. This document provides a brief description of different types of unvented roof assemblies and the benefits of unvented roof construction.