Does My Attic Need More Ventilation

Why roof ventilation is a must for example attic ventilation is used widely even in cold climates to evacuate the warm moist air that escapes from the living space below.

Does my attic need more ventilation.

That said air resistance and interference such as vent grates reduces the area of true ventilation. Roofing experts say the majority of u s. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Because this type of fan blows so much hot air out of the attic it often requires additional intake ventilation to replace the air such as a gable vent on the opposite side of the attic.

You can also contact your local municipality to check on building code in your area. 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. So a house with a 1 500 sq ft. Grab a flashlight and inspect your attic during the winter.

For the best results place roof ventilation near the roof s peak and soffit vents in the eaves. Attic will need 10 sq. In order to facilitate this exchange of warm and cool air the general rule of. Homes do not have proper roof ventilation which can lead to severe roof damage.

Of venting technically net free vent area or nfva for each 150 sq. 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 downside of attic ventilation fans. In some circumstances you can have less but we recommend the 1 150 ratio.

Hvi recommends a ratio of 60 to 40 for soffit ventilation to gable or ridge ventilation. Most building codes require a ratio of 1 150 ventilation space to attic floor space. If that air lingers it can cause condensation on the underside of the roof sheathing which can lead to wood rot and mold growth. Enter square footage calculate or enter the square footage of the attic or area to be vented.

Of venting ideally about half placed high on the roof and half in the soffits. In other words the entire vent opening doesn t count as vented space. Solar fans are powered by the sun so they don t require electricity to operate. Most building codes require 1 sq.

The federal housing administration recommends at least 1 square foot of ventilation for every 300 square feet of attic space. If you see dampness or frost you need better roof ventilation and some attic vents.