How To Vent Attic Space

To determine the area multiply the length times the width in feet.

How to vent attic space.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space. In some cases you may need to install a wind wash barrier of wood or plastic to close the gap between the top plate and the air chute to prevent wind from blowing into the attic.

Attic for example has an area of 1 200 sq. Hot air exhaust vents located at the peak of the roof allow hot air to escape. Consult your local building inspector for more information. The dormers and the attic space over the outside porch were sealed off from the rest of the attic by making a wall of plywood then insulating the wall with closed cell spf.

You can also contact your local municipality to check on building code in your area. Following this closed cell spf was also installed to the underside of the roof deck. Staple the chutes in place. Building codes and attic assemblies.

Attic fans perform this ventilation by pushing hot air out into the environment while also pulling fresh. So if your attic is 25 by 15 you ll need 2 5 feet of vent space. To choose the proper ventilation system for your attic you ll first need to know the total area of your attic. Then divide the total area by 150 to find the total amount of vent space needed for your attic.

Then aim for about 1 sq. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better. With the help of an assistant raise the vent up to the soffit and center it over the cutout slot. Ventilation helps maintain a healthy attic space both for your roof and for your family.

Space the holes 12 to 14 in. Be sure to wear long sleeves goggles and a dust mask. First determine your attic area by multiplying the length by the width. Next lay the strip vent down on a flat wood surface such as a plywood sheet or long 2 x 4 and drill 1 8 in dia.

Building codes typically echo the administration s guidelines. A 30 x 40 ft. Most building codes require a ratio of 1 150 ventilation space to attic floor space.