Should roof be re-shingled or replaced?

Answered by Brendan ~ March 22, 2010 ~ Comments

The asphalt roof on our Oregon house is 20 years old and it looks like there's another layer underneath. The roofing is beginning to come apart in places and curl up in other spots. Should we have the whole roof removed and reinstalled with a new one--or can we tell the contractors to just add another layer on top of the old roof?

Brad P. ~ Medford-Ashland, Oregon

Brendan Fowler

I usually do a full tear-off if there are already two old roofs in place. In this situation you will have to discuss the different options you have with your roofer and the costs associated with each. I would not accept an option that is not backed with a warranty. I would also ask to have all of the roof flashings replaced on plumbing vents, chimneys, skylights, crickets and valleys. Metal flashings do fail over time and a re-roof is a good time to replace them. I also like to examine the roof venting prior to re-roofing. If additional ridge venting or eyebrow vents could help the attic or rafter venting this is also a good time to put this in.

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