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The house I am building has a hip roof and therefore not enough ridge to support the desired length of ridge vent. By my calculations, 2640 sq ft of attic x 1.5 = 3960 sq inches of venting required. To balance the venting between the ridge and the soffits, 3960 / 2 = 1980 sq in the ridge and 1980 in the soffits. I plan to use Air Vent Shingle vent II which supplies 18 sq. in. of venting per linear foot. 1980 / 18 = 110′ of ridge vent needed. There is only about 90′ of ridge that can be vented.
The house also has 2 gables on it. What are the implications of mixing gable end vents with ridge vents and soffit vents? What other alternatives do I have? I’d rather not go with other types of roof penetrating vents.
I know that some of you do not advocate attic venting of any kind, however, I do not subscribe to that school of thought.
TIA
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The house I am building has a hip roof and therefore not enough ridge to support the desired length of ridge vent. By my calculations, 2640 sq ft of attic x 1.5 = 3960 sq inches of venting required. To balance the venting between the ridge and the soffits, 3960 / 2 = 1980 sq in the ridge and 1980 in the soffits. I plan to use Air Vent Shingle vent II which supplies 18 sq. in. of venting per linear foot. 1980 / 18 = 110' of ridge vent needed. There is only about 90' of ridge that can be vented.
The house also has 2 gables on it. What are the implications of mixing gable end vents with ridge vents and soffit vents? What other alternatives do I have? I'd rather not go with other types of roof penetrating vents.
I know that some of you do not advocate attic venting of any kind, however, I do not subscribe to that school of thought.
TIA
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he should use 3/4 copper pipe for the second floorSpheramid Enterprises Architectural Woodworks
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Gable vents only operate when the breeze blows, while soffit/ridge vents operate by the sun with heat buildup under the roof deck. The latter have proven to be over time more effective. It provides cooling at the source of the heat input -- under the roof deck -- and creates a solar "heat pump" when no breeze exists.
The problem with mixing in gable vents is that they tend to "short circuit" the cooling loop. Instead of drawing air from the soffits, the intake comes from the gables at the top of the roof. Soffit vents need a "suction" to work, which is created by hot air exiting the ridge vents.
Ideally, the vent areas on the lowest part of the roof -- the soffit -- should match the venting on the highest part of the roof -- the ridge.
Actually, your venting doesn't sound that bad. Another option is to place a t'stat controlled powered ventilator in the gable vent.