Roof/Attic Ventilation

Old 03-28-07, 11:58 AM
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Roof/Attic Ventilation

I am in the early process of getting quotes for a replacement roof on my one and half story house. The roof is in fair condition but my primary reason for a new roof is to improve ventilation in the attic. I live in Oklahoma and there were a few times last year that the attic reached above 180 degrees and as you can imagine the bedrooms upstairs were quite uncomfortable and even placing small a/c in them did not help much. After reading lots on the internet and this forum and think a lot of my problems are due to poor/no attic ventilation.

The current ventilation situation with my roof is 2 turbines vents on the primary roof (south side) above garage which is the largest portion of the attic. The air inlets are the problem as there is only one and it is small (10 x 14) and from what I can see it actually can do no good since it is completely blocked off by a dormer and insulation. One more thing, my roof has no soffits and no way to add them.

I believe my options are as follows. I would appreciate comments for each unless you have a better alternative.

Option 1
Install the required amount of louver vents for exhaust and do nothing for intake.

Option 2
Install gable vents into house to use for intake along with the louver vents.

Option 3
Install the required amount of louver vents for exhaust and install a GAF intake booster to add some intake air.

Option 4
Install Power Gable Vent for exhaust and another gable vent for intake and do not install any other louvers for exhaust

Option 5
Install gable vent for inlet and power exhaust along with intake booster

Option 6
Install gable vents for inlet and exhaust

Also for your information - Here are my numbers for my attic

Length 27
Width 29

Attic Square Feet 783
Net Free Area Required 2.87 square feet

Intake required 2.87 / 2 = 1.44 = 207 square inches
Exhaust required 2.87 / 2 = 1.44 = 207 square inches
Old 03-30-07, 10:02 PM
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I come up with 783 sq ft attic so you need 783sq "vent you need I/2 in and 1/2 out. Not sure just what or how you can go about it Id go for a gable on both ends .For a vent fan Attic sq ft X0.7 ==cfm or about a 548.1 cfm fan .
Old 03-31-07, 06:46 AM
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The simplest remedy would be to install new large gable intake vents. This is a must. Then install one vent per 6 linear roof feet. The recommendation for soffit vents is 1 per 8 feet. Since heat rises I would go 6 feet on the roof.

Another option I don't think you listed is the install a ridge vent along the entire length of thr ridge. You still must add the gable vents. Once you solve the intake then the exhaust is a matter of which exhaust 'method' you prefer.

By the , just curious, are you in computers someway?

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