How Much Roof Ventilation

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

How much roof ventilation.

Choose one of the following products to meet the recommended intake nfva of 528 square inches. Most building codes require a ratio of 1 150 ventilation space to attic floor space. How much ventilation does a flat roof need. 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.

With a power switch or a thermostat installation an attic fan can be turned on to let hot air from the attic out. Many people falsely assume that their roof doesn t require ventilation. It makes sense as all of us know that the most humid rooms in the house like the bathroom and kitchen need it. The two main dangers associated with too much ventilation involve roof damage and increased utility bills.

Ventilation can be accomplished using various products and techniques. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. 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. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed.

The following product options will allow you to achieve an intake nfva of 528 square inches. Allows cool dry air to enter the attic. A wind turbine catches the wind and spins a fan which pulls hot air outside.