House Attic Ventilation Requirements

Standard attic vents like af 50 s ventilation fans or solar powered attic fans.

House attic ventilation requirements.

Good insulation reduces fan effectiveness. 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. I had new power vents installed they are more powerful move more air than previous ones. 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.

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. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. The majority of the requirements related to attic ventilation have not changed much from the previous editions. 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.

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 works on the principle that heated air naturally rises primarily utilizing two types of vents. Feet of attic space divided 50 50. Ridge vents are one of the easiest ways to meet roof venting requirements.

Foot of ventilation for every 150 sq. These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and automatically exhausts the attic space. You can calculate attic ventilation requirements by determining the square footage of your attic. However the utility of attic ventilation fans is actually quite a controversial topic.

The key to proper ventilation of your roof and attic is balance. Attic ventilation fans whether hard wired or powered by their own solar panels seem like a low cost and effective way to help keep your house cool. Whole house fans powered attic fans. Other options to meet your attic ventilation needs are.

Fans and vents may be installed on the roof system that will draw the air out of the attic space and exhaust it to the exterior. The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes. Intake vents located at the lowest part of the roof. Right after noticed house was considerably cooler and i contributed this to new fans.

The following are the requirements taken directly from the irc.