Roof Space Ventilation

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Roof space ventilation.

Typically building codes include minimum attic space ventilation requirements as well as the roofing industry weighing in on practical guidelines. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. As a homeowner it is important that you review the soffit areas of the home for soffit vents. Proper attic ventilation can help reduce the load on your air conditioner.

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. Intake vents located at the lowest part of the roof under the eaves allow cool. Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing. An important part of installing any system of ventilation into your roof system is to make sure that there is a point of entry and a point of exit for airflow.

Proper attic area ventilation is an important performance consideration for a home or building with a steep slope roof. In order to find the right calculator divide the attic floor space by 300 sq feet. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves. Ventilation at the eaves roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

If you see dampness or frost you need better roof ventilation and some attic vents. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now. Vent the roof deck.

If the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge. There should also be a 50 50 balance of attic venting and roof venting. Calculate or enter the square footage of the attic or area to be vented.