Attic Ventilation Questions

AllGoNoShow

I have an attic that is 24X20. I think it is called a gable roof (four corners of the house meet at a peak in the middle). There is prolly 9 or so 8 inch by 1 foot soffitt vents around the perimeter (one side of the attic has an addition coming off with a catherdral ceiling so there are no soffit vents on that side).

I have looked and can't seem to find any roof vents anywhere. Suprisingly, when the outside temp is 45 and the inside is 64-the attic is 60 so from what i read that isn't too bad. My question is, how many vents (and what kind) should I put in? Would one just near the peak be enough?

Nick

AaronB

Measure your attic floor space. Install one sq. foot of net freev vent space per 150 feet of atticc floor space. Please rememberthat the mushroom type vents are usually 50 sq. inches. One sq ft is 144 sq. inches.

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For future reference if your roof comes to a point at the top it is known as a hip roof, not a gable.

AllGoNoShow

Thanks for the heads up!

AllGoNoShow

I actually just measured my soffits and did the calculations-I actually have 7.5 square feet of ventilation with just the soffit vents. The attic is only 580 sq. ft. so I have almost double the amount of ventilation required. Considering I am well over the minimum vent amount just with the soffit vents, do I have to add any roof vents? (currently there are none) If so how many should I add and where should i place them (this is a hip roof)?

Nick