I'm reroofing an older ranch house that has continuous soffit vent panels and gable-end attic vents but no ridge vents. I'm wondering if I should add a continuous ridge vent; it would be fairly easy to do while the roof is stripped. Is it okay to combine soffit-to-ridge roof ventilation with gable-end vents?

A. Mike Keogh, a specialist in energy conservation and ventilation from Campbellford, Ont., responds: Upgrading existing ventilation when reroofing is a smart move -- an opportunity that is missed all too frequently. But should you add a ridge vent to a roof with gable vents? No way -- that's a prescription for disaster. Gable vents will...

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