Roof Venting 101

These rules must guide design and construction no matter where the roof is being built.

Roof venting 101.

Here are five rules that are critical to the success of this simple roof design. In either season good venting occurs when cool air can enter the attic near the eaves and exit near the peak. Attic ventilation 101 november 1 2019 many may not realize that residential attic ventilation was a requirement in the very first edition of the building officials conference of america s boca s model building code published in 1948. Roof ventilation is based on the simple fact that warm air rises.

The true vent a re vent pipe the common vent and the loop vent. Entire attic or if you re venting only the roof deck. Although there are many different types of roof vents to choose from ensuring you have the right number of both intake and exhaust vents is a central part of roof design. The installation of roof vents is a crucial part of roof design because it allows for proper attic ventilation which may help prevent condensation and early aging of your roofing materials.

In summer the sun heats air in the attic. Ridge and soffit vents. Many fixtures are not so conveniently located however and other solutions must be found. In winter heat from your home warms attic air.

The goal of roof ventilation is to get fresh relatively cool air into the attic and vent out hot moist air. This type of ventilation is basically a ridge vent with a built in electrical fan that can speed. 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. A true vent is a vertical pipe attached to a drain line that travels through the roof with no water running through it.

Ridge vents are installed along the roof line and soffit vents are installed under the eaves. Vent the attic space learn how proper attic area ventilation is an important performance consideration for a home or building with a steep slope roof. And since hot air rises and is exactly what you want to vent out of your attic exhaust vents should always be installed at or near the top of the roof. 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.

Advantages of proper roofing ventilation. Roof venting 101 vent the attic space to ensure that a vented attic performs at its best you need to get the details right. If a fixture is close to the stack and on the top floor the upper part of the stack serves nicely as a vent.