How Much Roof Ventilation

The key to proper ventilation of your roof and attic is balance.

How much roof ventilation.

The two main dangers associated with too much ventilation involve roof damage and increased utility bills. With a power switch or a thermostat installation an attic fan can be turned on to let hot air from the attic out. Choose one of the following products to meet the recommended intake nfva of 528 square inches. A wind turbine catches the wind and spins a fan which pulls hot air outside.

However we rarely think like that for roofs even though they undoubtedly require ventilation. Ventilation can be accomplished using various products and techniques. The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. How much ventilation does a flat roof need.

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. Many people falsely assume that their roof doesn t require ventilation. Allows cool dry air to enter the attic. The following product options will allow you to achieve an intake nfva of 528 square inches.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.