How Many Roof Vents Should You Have

For the number of soffit vents in the example divide 8 square feet of ventilation needed by 0 5 for the number of rectangular vents required 16 in the example.

How many roof vents should you have.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. For example you might have to place one soffit vent and one other kind of vent for each 150 sq. Choosing round soffit vents for. Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have.

Based on your 1100 sq. Some local building codes carry special considerations that take precedence. You ll need the square footage of your attic to calculate the number of roof vents that you should need. And this guideline you ll need a minimum of.

For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. Fan calculation as a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. Measure your attic the building requirements will probably tell you to place a certain number of soffit vents per square foot of ceiling space.