Roof Space Ventilation

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.

Roof space ventilation. Ventilation at the eaves roof voids must be ventilated in order to stop warm air condensing on cold surfaces. There should also be a 50 50 balance of attic venting and roof venting. Condensation encourages rot and mould growth. To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now.

Calculate or enter the square footage of the attic or area to be vented. Grab a flashlight and inspect your attic during the winter. Typically building codes include minimum attic space ventilation requirements as well as the roofing industry weighing in on practical guidelines. 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.

Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing. 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. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

As a homeowner it is important that you review the soffit areas of the home for soffit vents. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. If you see dampness or frost you need better roof ventilation and some attic vents. Intake vents located at the lowest part of the roof under the eaves allow cool.

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. Proper attic area ventilation is an important performance consideration for a home or building with a steep slope roof. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves.