How Far Apart Should 3 Roof Vents Be Placed

Fairly simple stuff fresh air in old stale air out.

How far apart should 3 roof vents be placed.

Ft divided by 150 equals 10 sq. Different forms of high and low level ventilation are used as well apart from the soffit vents and ridge vents pictured. Place it two feet apart from the first row. It should be noted that these vents which expel warm moist air from the bathroom and food prep areas of the home need their own ducts and vent hoods which direct air to the home s exterior.

3 12 up to 4 12 pitch. Attic systems may use registers placed in the ceiling instead. Next divide the square footage of vent space required by the square footage of soffit vent you have selected. Roof ventilation this picture represents what is considered to be the best way to ventilate a roof space.

The federal housing authority fha requirement for attic venting is 1 square foot of venting for every 300 square feet of attic space. Pick out your soffit vent size and determine the square footage of the vent. Divide this by 144 to calculate how many square feet each vent is. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.

Of total vent space needed. When finished there should be a row of furring strips stretching from one end to another with the top edge aligned at the peak. 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. One square foot equals 144 square inches so the standard 16 inch by 8 inch soffit vent is 0 89 square feet.

Up to 45 psf ground snow load. Calculate the total vent area needed. For example if you use 16 inch by 8 inch soffit vents each vent is 128 square inches. Length x width of attic in feet 150 total sq.

The supply vents which push air through the duct work must be placed properly. In this case their height will be determined by your system. They should be divided equally between inlet and outlet vents and they can be used in any combination that will work with your roof s design. Starting at 1 foot from the bottom edge place 2 snow guards equally spaced apart in the valley in a staggered pattern across the entire roof area.

2 snow guards per valley every 10 feet of roof. A 50 x 30 attic would have a total area of 1 500 sq. Many have duct work in crawlspaces so the registers are placed in the floor. You need to have an equal number of vents located at the bottom of the attic or under the roof easement as you have at the top of the attic near a gable or ridge.

These vents and ducts should never share space with the roof vent and air should never be vented directly into the attic. For the previous example you would need 20 soffit vents.