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Question DetailsAsked on 9/9/2015

Can rotted underlayment for an asphalt shingle roof with 2 layers be repaired or does it require a new roof?

For an asphalt shingle roof with two layers of shingles (one original, one done less than 5 years ago), if there is rot repair needed does it need to be a full tear off and reroofing job? One contractor said yes, though I know another company repaired rot at the same time they did the job to add the roof over existing shingles, so there must be a way to do it.

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1 Answer


Here is a prior similar question with answers FYI -

Generally, if a local rot due to a leak in the roof or a flashing failure it can be properly and economically repaired, though will not get a perfect color match on the shingles in almost all cases. If due to general leakage many places, or rotting sheathing due to wet attic conditions, then generally an entire reroof job is indicated. All comes down to how likely it is that the sheathing is generally degraded, and if it is a local issue with a specific cause or a general roofing failure question.

Where the breakpoint is become hard to quantify, but I would say once you are over about 1/4-1/2 of the roof sheathing needing replacement, unless limited to just one portion of the roof say a particular gable or valley or such, you might as well go ahead and redo it all.

I hope this issue is not due to roofing over shingles - SOOO many people have problems due to that, and only saved probably 10-15% on the job in the process.

Answered 4 years ago by LCD

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