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Question DetailsAsked on 8/5/2014

Is it possible for roofing decking to be defective? I've got an 8 year old roof with bowing.

Roofer says it's not his fault, blames the decking supplier. 8 year old roof so out of their workmanship guaranty. Insurance adjuster (and public adjuster) review shows it wasn't weather. Concerned because it's on the northernmost edge of the middle section of our upper roof and starting to 'peel' up a 12-18" section of shingles a bit (literally one 4'x8' section or so it appears). Inspection by the roofer said the shingles are fine and there doesn't appear to be water signs inside the attic at all. Roofer is an 'A' grade Angie's List reviewee, offering to pick up half the cost of an estimated $6900 repair job. Both adjusters stated the total cost for a repair should be in the $1000 ballpark.

Think I need to get some other quotes... don't want to fight this one out... argh.

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2 Answers

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Couple of questions - use the Answer This Question button to respond, and you can post pictures using the left most yellow icon above the Answer box - pictures, even if only zoomed-in from the ground or a neighbor's window, would help a lot to understand what is happening:


1) the northernmost edge - is that at the peak, edge, or bottom of the slope ? And what sort of underlayment (water barrier) is at that location - tarpaper, plastic water barrier, or asphaltic or thick black ice and water shield ?


2) What general part of the country do you live in


3) when you say decking, I presume you mean the shingles - or are you talking the underlying plywood sheathing ?


4) is this only happening one localized place (which it sounds like from the $1000 estimate) or several places on the roof


5) if this appears to be bulging of the sheathing, at maybe only one sheet, can you get in the attic and look at the underside - is the sheathing bowing up from the rafters, which would indicate either water getting to it and causing expansion, or possibly initial installation without gaps so it is bulging up in the middle of the sheet ?


Give us a couple of photos to work with and I am sure several of the builder types contributing here can give you advice - in addition to myself there there are several general contractors and a couple of roofers who commonly contribute and will hopefully come back with their thoughts if you post photos.


From what you are saying, with a couple of people saying the shingles look fine, it sounds like this might be fixed either with tabbing of a few rows of shingles (basically gluing the leading edges down with bitumastic) or by removing about a third of a square of shingles, replacing a piece of sheathing, and replacing the shingles - a few hour job which should not cost more than the $1000 range stated. Sounds like the roofer, in trying to get you to pay half a $6900 repair job, is trying to talk you into a total reroof ?

Answered 5 years ago by LCD

1
Vote

More than likely you have a Sheet of plywood "DE-Laminating"..Depening on the type of material it is should not run that much.What I would sugest is find out Who the Manufacture is of the Shingles and get the Factory rep like(GAF,Certainteed,Owens Corning, etc) come look at it and inspect the roof.Could be the Roofer installed it wrong or could be in-addequete ventelation.Not enough Soffit intake vents and not enought Exhaust roof vents.I would start there first.Than go from there..

Source: Old Retired roofer.

Answered 5 years ago by Ronnie1970




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