Balanced Attic Ventilation

To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now. An under roof cathedral ceiling or attic ventilation system to help the building in any way needs to be properly designed and installed with adequate intake venting at the eaves outlet venting at the ridge and with careful sealing of air leaks from the occupied space into the attic or roof cavity to avoid heat losses or increases in both moisture movement into the roof cavity and increased heating or cooling costs. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.

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They have two basic models.

Balanced attic ventilation.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The most common method is the static method. I m thinking of the qufresh fan made by air king. Figure 1 a balanced system.

In cold weather ventilation helps remove moist air from the attic that has migrated from the occupied living space reducing the risk of condensation in the attic. Calculate or enter the square footage of the attic or area to be vented. In other words the entire vent opening doesn t count as vented space. The balanced approach helps to optimize air exchange between the attic and the outdoors and allows for effective management of temperature and moisture inside the attic.

This method relies on convection which is a mode of heat transfer that is caused by the tendency of warmer air to rise. The balanced attic consisted of electric power fans repositioned for maximum efficiency and air vent s new edge vent a shingle over intake vent. Balance is the key. There are two methods used to ventilate attics.

Another way to get balanced ventilation is to use the exhaust fans with controls and also install a supply fan. That said air resistance and interference such as vent grates reduces the area of true ventilation. Help protect your roof system from premature deterioration by installing a properly balanced attic ventilation system consisting of cobra exhaust vent at the ridge and adequate intake ventilation at or near the soffit areas of your 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.

Proper attic ventilation can help reduce the load on your air conditioner. The unbalanced attic consisted of a mix of ridge vents and electric power fans without intake ventilation. Figure courtesy of the nrca. You can do this with a bath fan installed to blow air into the home or you can use a fan made specially for this task.

Intake vents located at the lowest part of the roof under the eaves allow cool.

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