My 120-year-old house has no soffit vents and 2 passive roof vents a couple feet below the ridge line (no ridge vents). I want to add soffit vents in the wood soffits to provide more airflow because the attic gets HOT (I'm in Los Angeles, CA).
The roof is 12:12 pitched on 4 sides (no gable ends) so soffit vents are my only option other than cutting new holes through the roof deck. my question:
Should I opt for more, smaller vents (3.5"x14") or fewer, larger vents (5.5" or 7.5" x14") to get to the same amount of net free vent area?
Larger vents would be less work to cut and seal the vents against the soffit surface (the soffits are NOT flat) but I was thinking that more, smaller vents would provide more air movement across the whole inside surface of the roof deck, removing more heat from the surface. Or, maybe it makes no difference as long as the total NFVA is the same, and I'm overthinking this.
