re-roofing question

jcwill

Is it ok to install a 30yr architectural shingle over an existing 20yr fiberglass shingle on a 6/12 roof. the roof that is on there is in ok shape and the only reason the customer wants to change the roof is because a tree feel on part of the roof and thought might as well replace the whole thing. just wondering if anybody has done it in the past or do you HAVE TO tare off? didnt think it should be done but on the bundle of shingles it has instructions for re-roofing. thank you.

Grumpy

Define "OK". Acceptable by code? Maybe. Call your local code department. Many municipalities around here do allow it but each year more and more are requiring tear offs. In addition the City of Chicago who used to allow 3 layers lowered that to 2 layers maximum. Maybe in another 20 years they will begin to require tear offs too.

If you ask me, no a layover on a sloped roof is not "ok". Why? Sloped roofs are designed to shed water, but if you are simply installing shingles over shingles, which is what a lay-over is, then you are not doing anything to defend against backup to that system. Ice damning, wind driven rains, flashings, ventilation... In addition there could be bad wood beneath the original roof, how can you fix that if you don't tear off the old roof. If you don't fix the bad wood, the new roof will just blow away.

What does the customer want. You said "replace" the whole thing. To me "replace" means tear off. I always assume the customer wants a tear off unless they specifically tell me otherwise. I always start my presentation by explaining how we are going to protect before tearing off then explain we look for rotten wood when we tear off. At this point if they don't want a tear off, they let it be known. I then try to talk them into a tear off explaining why, showing them pictures of rotten wood. If they refuse, ok, but I tried.

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Ed the Roofer

Get him to sign an RCV Contingency agreement with you and guarantee that if you get the job approved via his home owners insurance policy for the amount equal to what a "Like Kind And Quality" roof replacement would cost, due to not being able to repair the old shingles and not being able to uniformly match the colors, that he would be responsible for his required deductible and fees for the upgraded roof.

The insurance coverage should cover the cost of removal and replacement for him.

Ed

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Jasonthompson

Plus didn't u say a tree fell on the roof in that case there prob some wood repair so u need to tear off at least that section of roof. But Grumpy and Ed are right u should always tear the roof off then u can find out if there is any problems u need to address. But thats my opinion.

scuglass

i turn jobs down if the h.o. does not want the old shingles tore off, but then again its each to there own .

roofcrazy

The biggest question you should be asking is, "do I want a good top quality job or just a so-so job?"A top quality job starts with a tear off to determine how good the decking is. And replace any/all problem wood. PERIOD!!

Nick Tomich

If the roof is in ok shape; no major curling, no missing shingles, no leaks,etc a new layer should be ok. Replace vents and soil pipe boots and tear off the ridge caps. Indiana allows 3 layers but i would never recommend. We have done work for H.O.A.s and P.o.a.s. Education to them is the key.

ronbryanroofing

No covers. Ever. All those reasons above and one more... Your pride and the right to say you do things right. HO's will respect flat out refusals of "covers" and imagine after the ability to collect any money for any additional work required to do the work properly and give a warrantee on your work? Walk away... walk away and shake your head.

gtp1003

I agree with alot said here. i will never do a recover 1 you put a 30 year shingle that will last 16 to 20 years at best. it will cook from behind. SO if the guy is planing on staying there for the rest of his life i would either do what ed said or tear offf or see yea.

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DFWRoofing

Can you? Yes
Should you? No