Vented Roof Underlayment

On this roof installation as on much of his project the owner did much of the work himself in order to learn about the new high performance products.

Vented roof underlayment.

Asphalt shingle hip ridge shingle ridge vent and a self adhesive underlayment. In a cold climate the primary purpose of ventilation is to maintain a cold roof temperature to avoid ice dams created by melting snow and to vent any moisture that moves from the conditioned. When it comes time to install the ridge vents if used for vented roofs cut back the underlayment. Roofing materials vent underlayment and other components owens corning roofing.

The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck. To protect against wind driven rain lap the underlayment under the rake edge. In fact installing this vented underlayment is straighforward enough for first time installers. The fact that a self adhesive underlayment system is recommended says it all and magnifies the need for a proper roof ventilation system.

The key goal is keeping the underlayment watertight. For optimum performance use cedar breather with rapid ridge 7 ridge vent. Most synthetic underlayments are approved for roofs as low sloped as 3 12 provided that the material is overlapped by about 50.