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Question DetailsAsked on 1/31/2017

How much to replace roof decking around dryer vent?

2 foot by 2 foot max cut out.

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1 Answer


Normally, you want to try to bridge three rafters or roof trusses with the sheathing to avoid counting on just an edge-supported piece of sheathing, and to avoid dimpling at the patch which commonly happens if it only spans between two rafters (commonly 24' apart). So - patch by most reputable Roofers would normally be 2x4 or 4x4 feet.

Depends on your roofing type of course, and whether they can salvage the roofing or have to put in new (probably about $50-100 materials cost difference if need replacement for normal asphalt composition singles, maybe a couple to few hundred $ if more expensive material - and probably about $300-500 for labor and the sheathing and water barrier and ice and water shield.

And of course they should figure out and remedy WHY it deteriorated there - poor penetration job by a dryer vent installer probably ? I use a patch piece of water barrier properly tucked and taped to drain out onto the top of the downhill barrier, then a commercial boot or one made of ice and water shield bonded to the water barrier around the pipe, then normal installation procedure for the vent hood (which should have a damper in it, NOT screening because that blocks off with lint.

My preference if roof penetration is avoidable within the distance limits for dryer ducting - avoid roof penetration at all and go out wall if possible - but NOT right out at the eaves where the moist warmm air will go right up into the attic. If that is the only option you have but you have eaves, I prefer (encased in insulated pipe if in cold winter area) to run it out an eave and under the roof overhang to a discharge just past the roof - though different roofing schemes and gutters and such can make that a bit unsightly if it has to end up coming out under the gutters to free-air discharge.

Answered 3 years ago by LCD

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