How Many Roof Vents Should You Have

Hot air exhaust vents located at the peak of the roof allow hot air to escape.

How many roof vents should you have.

For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. Attic for example has an area of 1 200 sq. Solid vinyl soffit material costs the same as the vented material. Attic ventilation requirements how many attic vents your roof needs.

If you have a hip roof with very little ridge a power fan with both a thermostat and humidistat for both temperature and humidity should be installed with no ridge vent. If the home already has a fan roof vents or gable vents these should be blocked and sealed from the attic side of the home. Then aim for about 1 sq. With any attic ventilation system the attic can be 20 degrees hotter than outside.

Foot of ventilation for every 150 sq. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Enter square footage calculate or enter the square footage of the attic or area to be vented. Then you can begin choosing the style and type of roof vents you want for your home.

A 30 x 40 ft. First determine your attic area by multiplying the length by the width. Choosing round soffit vents for this home means that 8 square feet of required ventilation be divided by 0 196 for about 40 round vents. In of vent opening per 150 sq.

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. 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. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. 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.

You ll need the square footage of your attic to calculate the number of roof vents that you should need. Feet of attic space divided 50 50. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.