Attic Insulation Ventilation Balance

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Attic insulation ventilation balance. Calculate net free vent space. An attic fan is only recommended if your home is sealed off from the attic and the soffit vents are unobstructed. For diy attic insulation you ve got two choices. Where the location of wall or roof framing members conflicts with the installation of upper ventilators installation more than 3 feet 914 mm below the ridge or highest point of the space shall be permitted.

Building codes typically require 1 square foot of venting space for every 150 square feet of attic space. Both can be added to uninsulated attics or layered over existing material. For help achieving the right balance between ventilation and insulation in your charlotte area home please contact us at ross witmer. This cools your hot attic by drawing in air from outside and pushing overheated air to the exterior.

The general rule of thumb is to have at least one square foot of vent space for every 150 square feet of attic area. Unfortunately too many houses have sufficient exhaust but inadequate intake. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. If there s a vapor barrier beneath the insulation it can be 1 300.

To keep the ventilation space clear above soffit vents special baffles need to be installed before the insulation goes in. In most cases the best type of attic insulation will be blown fiberglass or blown cellulose insulation. After successful completion the student should be able to perform an inspection of the attic insulation ventilation and interior of a residential property according to the internachi residential standards of practice. Balanced soffit to ridge and unbalanced soffit to soffit only.

The modeled attic had gabled construction measured 50 by 27 feet with a 4 12 roof slope and had r 30 insulation in the ceiling. Placing the fan on a timer helps you save energy. Some homeowners also take the time to build walkways and or storage platforms in the attic prior to installing insulation. Intake vents located at the lowest part of the roof under the eaves allow cool.

Loose fill or batt the common term for blanket insulation. Our experience dates back to 1945. We evaluated two ventilation schemes. The potential problems vary with the type of exhaust vent being used.

The balance of the required ventilation provided shall be located in the bottom one third of the attic space.