Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
House attic ventilation requirements.
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.
You can calculate attic ventilation requirements by determining the square footage of your 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.
The following are the requirements taken directly from the irc.
Good insulation reduces fan effectiveness.
Feet of attic space divided 50 50.
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.
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.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
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.
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.
Right after noticed house was considerably cooler and i contributed this to new fans.
Whole house fans powered attic fans.
Told that the 2 attic power vents are the only attic ventilation i have the house does have vented soffits every other soffit cover is vented.
The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.
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.
However the utility of attic ventilation fans is actually quite a controversial topic.
The majority of the requirements related to attic ventilation have not changed much from the previous editions.
The downside of attic ventilation fans.
Foot of ventilation for every 150 sq.
Intake vents located at the lowest part of the roof.
The key to proper ventilation of your roof and attic is balance.
I had new power vents installed they are more powerful move more air than previous ones.
How attic ventilation works.
