The ventilation rule I follow is to provide 1 sq.ft. of ventilation for every 150 sq.ft. of attic space. This needs to be balanced, so that 50% of ventilation forms the inlet at the soffits, and 50% forms the outlet at the vents. Perforated soffits have different degrees of penetration, some have as little as 0.01 sq.ft. of ventilation for every sq.ft. of soffit, and some have higher number up to 0.06 sq.ft. Your attic is 52x22 = 1144 sq.ft. requiring 7.6 sq.ft. of ventilation (1144/150). 50% (or 3.8 sq.ft.) needs to come from the soffits. The perimeter around your house is roughly 150 ft. (52+52+22+22). Assuming that you have a soffit 1 ft. wide, you have about 150 sq.ft. of soffit. If you install ventilated soffits having clearance of about 0.03 sq. ft., you will have 4.5 sq.ft. (150 x .03) of effective ventilation, which is just a bit bigger than the 3.8 sq.ft. you need. Is this what you were looking for? |
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