Roof Vent Area Calculation

Ft divided by 150 equals 10 sq.

Roof vent area calculation.

Calculate the total vent area needed. In order to have a balanced ventilation system you need to have the right roof vent calculation. Of total vent space needed. A normal metal pot vent produces only 50 squares inches of free net area.

According to their requirements you should have 1 square. Attics area can heat up to 165 degrees f or more 73 9 c. The most common roofing materials used in the united states include shingles. To accurately calculate the area of your roof you must first determine its slope or pitch.

Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs. 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. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The area calculator can be used to calculate the area of a variety of simple shapes that together can comprise the area of the roof.

Use avp s roof vent calculator to determine the number and size of exhaust vents you will need. 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. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator. Width or area.

The calculations before indicated that we needed 2 square feet of ridge or upper roof ventilation. Length x width of attic in feet 150 total sq. Ridge static attic vents 384 00 minimum sq. For balanced ventilation an equal amount of intake vent area net free area should also be installed.

A 50 x 30 attic would have a total area of 1 500 sq. Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge. A 12 in 12 pitch is a. Two square feet equals 288 square inches.

The federal housing authority fha and the urban development hud have established minimum requirements for attic ventilation. Of net free area of intake needed at or near the soffit. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Enter square footage calculate or enter the square footage of the attic or area to be vented.

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.