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That keeps your attic dry and reduces ice dams.
Attic ventilation requirements. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. Code requirements the international building code. That cuts cooling costs and prolongs shingle life. 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.
Attic ventilation requirements how many attic vents your roof needs industry standard for proper attic ventilation recommends for no vapor retarder type of attic insulation no paper plastic or aluminum layer between the attic floor and insulation layer 1 sq. The following product options will allow you to achieve an intake nfva of 528 square inches. Ridge vents are one of the easiest ways to meet roof venting requirements. Current regulations state that the minimum attic ventilation requirements are 150 1.
Divide the square footage item 1 by 300. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Most building codes require a ratio of 1 150 ventilation space to attic floor space. Intake vents located at the lowest part of the roof under the eaves allow cool.
Other options to meet your attic ventilation needs are. In the winter warm moist air seeps into the attic from the living space below. Foot of ventilation for every 150 sq. Typically building codes include minimum requirements applicable to attic ventilation.
The roofing industry also has practical guide lines for attic ventilation. The two square feet is divided equally between the intake and the exhaust one square foot for each. In the summer good attic ventilation reduces heat buildup. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.
Feet of attic space divided 50 50 between the inlets and outlets. Allows cool dry air to enter the attic. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Calculating attic ventilation requirements.
This means that if you have a 1500 sq attic then you would need at least 10 sf of ventilation. Choose one of the following products to meet the recommended intake nfva of 528 square inches. The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes. Result of item 1 300.
Good ventilation allows the heat and moisture to escape. 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.
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