Garage Roof Ventilation Requirements

Solar roof mounted garage fans.

Garage roof ventilation requirements.

The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. If you don t know how your roof vents work or if you re unsure about your attic ventilation in general you should talk to a roof inspector about your current system and any inherent weaknesses that may be at. In of vent opening per 150 sq. You can calculate attic ventilation requirements by determining the square footage of your attic.

Enter square footage calculate or enter the square footage of the attic or area to be vented. So if you don t have the funds to install more windows or don t want to keep the operating door cracked open to help with the problem for security reasons the next best solution is an exhaust fan. If your garage suffers from poor ventilation there is little you can do about it without costly repairs or renovations. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Intake vents located at the lowest part of the roof under the eaves allow cool. Step 2 purchase an exhaust fan kit. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.

Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. 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. A roof which has been put straight on the garage ceiling is probably best for your purposes. Then aim for about 1 sq.

When you have worked out what your garage is like then you can start looking for a garage exhaust fan. A self installation kit is probably the best variety for the needs of an attached garage. The open area of a vent is sometimes listed on the roof air vent as nfva net free vent area. If not measure the size yourself.

Most effective ventilation uses a ridge and soffit continuous ventilation system but even these designs can vary from roof to roof.