How To Vent Attic Space

The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.

How to vent attic space.

Screw holes through both flanges. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. To choose the proper ventilation system for your attic you ll first need to know the total area of your attic. Attic fans perform this ventilation by pushing hot air out into the environment while also pulling fresh.

Staple the chutes in place. With the help of an assistant raise the vent up to the soffit and center it over the cutout slot. To determine the area multiply the length times the width in feet. Be sure to wear long sleeves goggles and a dust mask.

Ventilation helps maintain a healthy attic space both for your roof and for your family. Space the holes 12 to 14 in. 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.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Building codes typically echo the administration s guidelines. Then aim for about 1 sq. Consult your local building inspector for more information.

First determine your attic area by multiplying the length by the width. You can also contact your local municipality to check on building code in your area. Then divide the total area by 150 to find the total amount of vent space needed for your attic. When determining how to insulate this attic space various assemblies were taken into consideration and a hybrid combination of vented and unvented attic space was planned.

In of vent opening per 150 sq. A 30 x 40 ft. 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. Most building codes require a ratio of 1 150 ventilation space to attic floor space.

Following this closed cell spf was also installed to the underside of the roof deck. The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space. Building codes and attic assemblies.