How Much Roof Ventilation

It makes sense as all of us know that the most humid rooms in the house like the bathroom and kitchen need it.

How much roof ventilation.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. However we rarely think like that for roofs even though they undoubtedly require ventilation. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Allows cool dry air to enter the attic.

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. 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. How much ventilation does a flat roof need. Dangers of too much ventilation.

Many people falsely assume that their roof doesn t require ventilation. The key to proper ventilation of your roof and attic is balance. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed.

With a power switch or a thermostat installation an attic fan can be turned on to let hot air from the attic out. A wind turbine catches the wind and spins a fan which pulls hot air outside. Ventilation can be accomplished using various products and techniques.