Is it possible to have too much soffit intake? Currently my simple gable roof on a ranch home has 8 RVO38 vents but NO soffit intake vents (terrible!). Of course the attic space runs incredibly hot and is not doing me any favors. I need to get the venting improved pronto.
The soffit boards sag and have signs of water damage from previous owner's overflowing gutters, so I wanted to replace them with some t&g cedar and put in a continuous soffit vent. If that didn't help attic venting I would have a ridgeline vent installed. Would it potentially be bad to give myself all that soffit venting or could I try that and see if it is adequate before going to a ridgeline vent?
You generally want a balanced system with equal intake and exhaust areas, but if you can't balance the system, then there should be more intake area so none of the exhausts (usually near the peak) get back-drawn and act as intakes.
Intake vents are incredibly important, I believe at least 1 every 8’ in all eve soffit areas. The exhaust vents may be passive or powered. The most important thing about the exhaust vents is to install them at the highest portion of the roof. Never allow ridge vents or any exhaust vents to be more that 2’ difference in the height of the roof. If you do install with the height difference of more than 2’ you’ll cause a short cycle between the exhaust vents instead of drawing from the intake vents. All of this I’d determined how the attic is built. Sloped ceilings require a very specific way to vent as well as roofs that are sectioned off where the air doesn’t travel throughout the entire home. When in doubt, it’s always best to have an expert review the home and advise you for the best results. I’ve read quite a bit on this site, it’s true, no heat or cooling is lost from ventilation, as long as you have enough insulation, vent all you can to keep the home dry and the roof from baking.