Build Attic Ventilation

This article will cover why you need ventilation the most common type of ventilation the building code requirements and common ventilation related issues. However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic. The recommended ventilation ratio to provide for vented attic assemblies when an air barrier is present is the 1 300 ratio as specified by most building codes.

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First determine your attic area by multiplying the length by the width.

Build attic ventilation.

This article will show you how it can be done. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. Then aim for about 1 sq. Constructed of white aluminum that can be painted.

If your attic isn t ventilated well that humid moist air will build up in the attic space and can cause mold to grow. Of vent for every 300 sq. Measure the gable to decide how large a vent you can. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

You can also contact your local municipality to check on building code in your area. Attic for example has an area of 1 200 sq. Most building codes require a ratio of 1 150 ventilation space to attic floor space. Power gable vent shutter is automatic 20 in.

Attic ventilation serves two main functions. Attic fan ventilation attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside. This is based principally on good historical experience and simple psychrometric analysis handegord giroux 1984. To better understand attic ventilation it is best to start with the basics.

Although you can buy manufactured gable vents you might want to build your own wooden vent that matches your home or building s exterior. Power gable vent shutter is designed to be used with master flow egv pg series electric gable fans. Therefore whole house fans are best suited for open well vented attics. The shutter will open when the electric gable vent is operating.

A 30 x 40 ft. In of vent opening per 150 sq. Building codes vary. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.

To lower attic temperatures and to remove. Cool your home lower energy costs and increase efficiency with an attic ventilation fan.

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