Page 2 - 6-VENTILATION
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198 VENTILATION
The minimum requirement to ventilate your home is 1 sq. ft. of ventilation for every 300 sq ft of ceiling area, except in cathedral or less than 2/12 pitch when 1 sq. ft. of ventilation is required for every 150 sq ft.
To give the correct air circulation, 50% of this vent area should be in the roof and 50% in the soffit.
To determine the square footage measure the length and width dimensions of your attic space, including the overhang of the roof. Multiply each separate roof area where applicable; L x W, and treat them as separate areas to be ventilated.
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