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herrblint

metal roof on a house lacking overhanging eaves: intake ventilation

herrblint
7 years ago

Nothing but complications. The house has ridge and hip vents but no overhanging eaves, and thus no soffit intake vents. However, the front roof and a hip roof on the west side of the house have a one-inch intake gap above the fascia board as intake. On the rear roof, and on a hip on the east side of the house, that intake gap is blocked by fascia trim. I don't know how that ever came to be. But since we have cedar shingle on skip-lath at present, intake ventilation has not really been a problem, as plenty of air flows through the cedar. No mold or condensation problems after 22+ years. But the roof does need to be replaced, as it was tree-shaded and is mossy now and beginning to crumble especially at the eaves.

We are considering standing seam. One roofer said it could go directly onto the skip-lath, that solid decking is not required, except along eave with ice-guard, as we are located in the northeast.

With metal, ventilation air-flow becomes more critical than with cedar shingles.

My question is, are so-called "under-shingle" intake vents, the kind where a one-inch slot is cut in the solid decking six inches above the drip edge, compatible with standing-seam metal roofs? We would need such an under-shingle vent only on the back of the house, and one the east hip, where fascia trim is blocking the gap. But would such a vent have to be installed on all roof planes, so that the hip seams are not a-kilter?


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