Roof Space Ventilation

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. If you see dampness or frost you need better roof ventilation and some attic vents. 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.

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There should also be a 50 50 balance of attic venting and roof venting.

Roof space ventilation.

As a homeowner it is important that you review the soffit areas of the home for soffit vents. 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. Calculate or enter the square footage of the attic or area to be vented. Ventilation at the eaves roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

Vent the roof deck. Condensation encourages rot and mould growth. Proper attic ventilation can help reduce the load on your air conditioner. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow.

To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Typically building codes include minimum attic space ventilation requirements as well as the roofing industry weighing in on practical guidelines. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves.

Grab a flashlight and inspect your attic during the winter. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves. Proper attic area ventilation is an important performance consideration for a home or building with a steep slope roof. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.

Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing. In order to find the right calculator divide the attic floor space by 300 sq feet. Intake vents located at the lowest part of the roof under the eaves allow cool.

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