Some might think that building codes could have been different ~20 years ago when the house was built, but the principles of fluid flow didn't change. Matching intake capacity with exhaust is a no-brainer.
The vacuum that develops as hot air escapes through the roof vents has to be replaced, and if it's not getting cool air from the soffits, then it's pulling inside air from from every poorly foamed hole that extends through the ceiling. In the summer it's trying to extract the AC cooled air into the attic to backfill the vacuum that is created by insufficient soffit flow.
Quote:
Originally Posted by freebeard
Beyond the intake/outflow there is the internal structure. I assume rafters or trusses on 16" centers, dividing the roof plane into cells.
You might do better with small vents on 16" centers.
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The 15" vents are 16" on center.