Unvented Roof Detail

Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing.

Unvented roof detail. If you don t want to use sips or nailbase there are four basic approaches. Four options for building an unvented roof assembly. Sign up now to get the latest metal roofing and metal architectural product news 6 times a year. Monolithic continuous exterior insulation ci above structural sheathing.

Two potential unvented roof assemblies. If not feasible additional analysis required. The unvented attic space is completely contained within the building thermal envelope 2. In this case you can learn a lot from foam tech s article vented vs.

Roof sheathing to be air sealed. Detail of an unvented cathedralized attic showing air impermeable spray foam insulation plus batt insulation installed on the underside of the roof deck. In a vented roof foam can seal the openings and serve as an air barrier and a vapor retarder in addition to its insulating function. Sc historically typical construction of homes in canada and the us have vented attics between the ceiling of the interior space and the roof.

These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. 40 of insulation r value to be above sheathing. We respect your privacy and will not use your email address for other. Factors to consider when determining where to locate the thermal barrier in new construction include climate desire for additional living and storage space building design and configuration and location of hvac.

Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. Unvented metal roof ted storm posted in energy efficiency and durability on april 27 2011 09 53am in the process of construction currently have a standing seam metal room installed over synthetic felt over osb. Eave detail w gutter 1. Ci to be installed in multiple layers to limit insulation by pass from gapping of insulation.

Unvented roofs which provides a detailed explanation of each. 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. No interior vapor retarders are installed on the ceiling side attic floor of the unvented attic. Unvented attic assemblies spaces between the ceiling joists of the top story of the roof rafters shall be permitted if all of the following conditions are met.