House Roof Ventilation Design

Roof vents comprise intake and exhaust vents that permit free movement of the air in the ventilation spaces.

House roof ventilation design.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. While designing the roof it is essential to choose the right number of intake and exhaust vents. Ventilation openings shall have a least dimension of 1 16 inch 1 6 mm minimum and 1 4 inch 6 4 mm maximum. Sure installing roof vents for older homes can reduce your hot air during the summer but there are probably more low risk cost effective ways to increase your home s energy.

Enter square footage calculate or enter the square footage of the attic or area to be vented. When installed as part of a properly balanced when installed as part of a properly balanced attic ventilation system gaf cobra exhaust vent is a shingle over exhaust vent installed at the roof ridge that helps exhaust excess heat and moisture from your attic. The building codes and building science for natural roof ventilation however only appeared in the 1940s. Intake vents located at the lowest part of the roof under the eaves allow cool.

Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams. 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. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. The right balance of intake and exhaust vents can enhance the life of the roof system and improve energy efficiency.

Roof system ventilation is required by the model building codes such as international residential code irc which includes irc r806 roof ventilation that requires ventilation for attics and cathedral ceilings and icc r905 1 requirements for roof coverings that requires builders to follow the manufacturer s installation instruction. A good ventilation system should be energy efficient prevent unwanted moisture and be cost efficient in direct relation to the size of your house. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.

It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters.