Roof Vent How Far From Peak

But consider a moderately sized home whose attic space is 36 feet deep 50 feet long and 10 feet high at the peak.

Roof vent how far from peak.

If the slope of your roof is greater than 6 12 you will need more ventilation to reflect the extra volume of attic space. This attic space contains 18 000 cubic feet of air. Distance matters the top of a chimney pipe must extend at least 2 feet above the peak of the roof if the pipe is within 10 feet of the peak. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.

The venting in the roof should never be cut all the way to the edge but that doesn t mean you can t install the vent cap all the way to the edge. Where a roof is used for any purpose other than weather protection vents shall extend at least 7 feet above the roof and shall be properly supported. A single 12 inch diameter turbine vent could provide a complete change of air in the attic space every 52 minutes if the outside breeze was just 5 mph. This gives you 450 square inches of total exhaust.

Asphalt roofing and nrca. These vents are installed in the soffit the enclosed portion under the roof overhang and permit air to flow up under the roof and into the attic. Vent pipes shall terminate not less than 6 inches above the roof measured from the highest point where the vent intersects the roof. Calculate 20 per cent more for 7 12 to 10 12 pitches and 30 per cent more for a pitch that is 11 12 or greater.

To calculate an example of exhaust and intake use 25 feet of roof ridge vent. Multiply it by 18 square inches the net free air per foot of ridge. They range in style from 6 inch round stainless steel vent covers that are placed in the soffit between each rafter to continuous vents that run the entire length of the soffit. We cut the vent in the roof decking sheathing to within a foot or 2 of the edge and always install shingle vent 2 right to the edge because most people think it s a cleaner look.

12 4 4 location of vent terminal. Building code specifies 1 square foot of venting for every 150 square feet of attic floor space with the venting distributed equally between soffit vents and roof or gable vents.