Attic Baffles Requirements

Rafter vents or insulation baffles install in any rafter space.

Attic baffles requirements.

The main function of an attic baffle is to draw the air in from outside your home and allowing it to circulate around your attic. Fit each one snuggly in the bay with the bottom starting where the ceiling joist meets the roof rafter. Each bag lists the required depths for a range of r values and the number of bags needed to cover 1 000 square feet at those depths. Measure your attic s square footage.

You can situate the baffles where the circulation is mainly required. Calculate the total vent area needed. Ado products durovent 23 1 2 in. Surprisingly even the most well insulated attic space may still require the assistance of attic baffles to provide the additional air circulation.

You will need a baffle for each space between the rafters. Attic baffles how they work. Basic functions of baffles baffles are chutes that when installed properly can provide a channel for air to flow from your exterior soffit vents up into your attic space. Length x width of attic in feet 150 total sq.

That means drawing air in from outside the home and allowing it to push through the attic. Attic ventilation system with built in baffle 10 per carton 4 4 out of 5 stars 3 accuvent 14 5 x 50 16 o c flame retardant pvc high energy vent 50 pack acbp18429. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. A 50 x 30 attic would have a total area of 1 500 sq.

Multiply the length of the attic times the width in feet to find the attic area then divide by 150 to find the total square feet of vent space needed. While it may seem counterintuitive even well insulated attic spaces require air circulation. For batts or rolls calculate the number based on the width and length of the product you re using. Ft divided by 150 equals 10 sq.

Pull any existing insulation away from the edges of the attic where you will be putting up the baffles. Of total vent space needed. The picture below courtesy of the epa indoor airplus program which we provide builder verification services for helps show how the system works. For loose fill read labels.