Unvented Sip Roof

Sip roofs have extreme advantages over traditional framed roofs.

Unvented sip roof.

In order for an un vented roof assembly to function properly the following conditions must be in place. Asphalt shingles store water from dew condensation due to night sky cooling and rain. This style of roof helps to prevent moisture buildup. 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.

Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. Need to make a final decision on which underlayment to use under a metal roof on an unvented roof system. Beams on 5 centers. This receptor is an air space that can be accomplished in a variety of ways.

Venting at the ridge and eave allows air to move freely between the two layers of sheathing. Therefore an unvented sip roof is permitted under irc r806 5 unvented attic and unvented enclosed rafter assemblies. This document provides a brief description of different types of unvented roof assemblies and the benefits of unvented roof construction. 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.

The roof is currently built as follows. The 2012 irc permits unvented roof assemblies including unvented sips. Four options for building an unvented roof assembly. 3 8 plywood diaphragm seams taped.

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. Extreme insulation up to r 51. If you would like to receive a price quote on a sip project please request a sip quote. Factory engineered and precut per floor plans all but eliminating measuring or cutting material for roof structures.

Create a cold roof by applying a layer of sheathing over 1 3 furring 16 in. Integrated sheathing and roof deck for a one stop roof framing product. 1 1 2 t g decking. With tribuilt granulated self adhering underlayment on top of the plywood.

If you don t want to use sips or nailbase there are four basic approaches. These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck.