Cold Deck Roof Ventilation

This is caused by air leaking up from your home into the attic in the winter and condensing on the cold deck.

Cold deck roof ventilation.

Ventilation is required to the underside of the deck. Adding attic ventilation can help but the real problem is heated air leaking up into the attic. The deck air when properly installed with proper exhaust vents provides a balanced ventilation system to rid your attic space of trapped heat and moisture. It is universally recommended that cold deck flat roof construction should be avoided.

In cold climates poor roof ventilation can also cause the buildup of ice on roofs. See energy smart details in fhb 218 for more on ice dams. 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 living space to the attic. 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 living space to the attic.

Ice dams can cause thousands of dollars of damage to roofs and interior building materials. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a. When placed below the structural deck. Mold on the roof deck or rafters.

In cold climates the primary purpose of attic or roof ventilation is to maintain a cold roof temperature to control ice dams created by melting snow and to vent moisture that moves from the conditioned space to the attic ventilation acts to bypass the vapour barrier created by most roof. Throughout the balance of this digest the terms attic and roof will and can be used interchangeably. No ventilation is required for these types of roofs. 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.

The da 4 is an excellent solution for roofs with little or no overhang for the installation of traditional intake vents.