I will try to make this as clear as possible.
Well, I just finished my new roof (tore 2 layers of old shingles off, added GAF Timberline 30 Arch shingles). I also added a ridge vent the entire length of the roof (73' long).
My next step is to replace all the aluminum on the windows, doors, soffits and gutters. I decided to start ripping some of the soffits today to see how the house vented currently. Aluminum soffit was used with 1 vented piece for every 3 solid. When I ripped the solids there was plywood running the entire length of the roof. Wherever there was a vented aluminum panel, a 6"x6" hole was cut into the plywood and I could see up into my attic (I have a ranch).
Since I would like to install new soffit (either vinyl or aluminum where each piece has a vent in the middle), what would be the easiest way about this?
I could use a circular saw set to the depth of the plywood and cut a strip out of the plywood the entire length, but that would be difficult to do upside down, especially where I have an area where the soffit climbs to 20+ feet high.
I also thought of just pulling all the plywood, then just covering it with the new soffit. This would basically leave me the entire 16" of overhang around the house to be totally open to the outside with only the soffit pieces blocking it. Would this be acceptable?
I installed a GAF cobra vent across my entire roof (73' long minus 1.5' at each end, or 70' of vent). According to the GAF webpage, it has an area of 16.9 sq inches of NFA (net free area) per foot, or 1183 sq inches in my case for air leaving the attic. I have read that your incoming area should always be greater than the outgoing, meaning I need more than the 1183 sq inches.
I plan on using a Triple 4" Center Vent for soffit (see following link)
Per that page, it only provides 1.56 sq inch per foot. I have 73 feet of soffit in the rear of the house, and 45 feet in the front. This would equate to only 184 sq inches of incoming air. This seems very small. The soffit vents on the GAF webpage are only 1.75" wide and are supposed to flow 82 sq inches per 8 feet of vent.
Would this still hold true if I totally removed all the plywood under my old soffit, thus having 16"x73' feet of total opening in the rear and 16"x45' in the front under the new soffit?
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