Unvented Sip Roof

This style of roof helps to prevent moisture buildup.

Unvented sip roof.

Un vented roofs operate on the principle that moisture entering the roof assembly can be controlled and that there is no need for venting to control moisture accumulation. This receptor is an air space that can be accomplished in a variety of ways. When constructing unvented roofs with asphalt shingles in hot humid climates a vapor barrier must be installed between the asphalt shingles and the roof deck. Next i ll be screwing down 5 1 2 raycore sips panels over heated space and framing boxes over the eaves covering everything with 5 8 cdx.

Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. Create a cold roof by applying a layer of sheathing over 1 3 furring 16 in. Beams on 5 centers. Need to make a final decision on which underlayment to use under a metal roof on an unvented roof system.

If you don t want to use sips or nailbase there are four basic approaches. Venting at the ridge and eave allows air to move freely between the two layers of sheathing. With tribuilt granulated self adhering underlayment on top of the plywood. The 2012 irc permits unvented roof assemblies including unvented sips.

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. This document provides a brief description of different types of unvented roof assemblies and the benefits of unvented roof construction. The roof is currently built as follows. Four options for building an unvented roof assembly.

1 1 2 t g decking. Sip roofs have extreme advantages over traditional framed roofs. Therefore an unvented sip roof is permitted under irc r806 5 unvented attic and unvented enclosed rafter assemblies. 3 8 plywood diaphragm seams taped.

Integrated sheathing and roof deck for a one stop roof framing product. Asphalt shingles store water from dew condensation due to night sky cooling and rain. With an unvented sip roof the argument would be that the exterior osb facing constitutes the structural sheathing referred to in the code. In order for an un vented roof assembly to function properly the following conditions must be in place.

If you would like to receive a price quote on a sip project please request a sip quote. Extreme insulation up to r 51.