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Old 12-20-2010, 10:49 AM  
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Default New Roof problems


I am looking for advice from someone who knows about these kinds of things.
I have pictures and would really appreciate it if you could tell me what you think the problem is or if it is even a problem. The roof on my 1 year old house and vertical bumps and just today i found water dripping on siding. the pics from the roof are from last year when rood was 3 months old. The company told me this is normal. Please let me know what you think.


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Old 12-20-2010, 01:31 PM  
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Lilypad, no, what you are seeing is not normal. You are seeing the ends of the plywood sheeting cupping on the roof deck. Without out physically being on the roof, my best guesstimate is that the rafters are set on 24" centers and they used 3/8" plywood for the decking. When the decking was installed they also seemed to of missed nailing into the ends of the decking into the roof rafters. The only permanent fix is to strip the roof, re deck with 1/2-5/8" decking and then re shingles. Improper ventilation will also cause cupping. That needs to be inspected from inside the attic area. Ventilation is a 2 part equation, unrestricted intake at the eave (gutter) and exhaust at the ridge line. Also, use of a cheap, 20 year shingle will telegraph any imperfections on the roof slope.

Where are you seeing the water running down the wall? Is it only near the exhaust for the dryer?

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Old 12-20-2010, 07:20 PM  
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Post a picture of the inside attic view of the roof sheathing. It appears to be edge swelling from using OSB without the required 1/8" gap between sheets. We will be able to see the "H" clips between sheets if 3/8" sheathing from a picture. Waiting.....
Probably the bath fan exhaust up that high?


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Old 12-23-2010, 12:39 PM  
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Yeah, that first picture bothers me. What sometimes happens is the OSB is left uncovered on the job site and gets rained on and the edges swell. OSB can be like a sponge. It should be outlawed along with Ethanol. (just kidding about outlawing OSB)

or, it could be the 3/8 ply or missing clips or some combination of things.

The water on the wall in the 3rd picture is a bit weird too. It could be nothing but it sure looks like its coming from that vent above it. I would get a ladder up there to investigate.

Also, as has been suggested - proper venting is key to roof longevity.
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Old 01-08-2011, 12:54 AM  
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Lily when your roof was installed what did the tear off consist of ?Was it a layer or two over woodshake resulting in a redeck? Meaning that it had woodshakes under other layers and it required all new plywood ? The reason i ask is because it looks like to me another case of NOT offsetting the plywood by 4', what that means is generally when plywood is installed a full sheet(4'x8') is installed the full length of the gutterline, then when you start another course of plywood instead of a full sheet you would put in a piece that is half of the size of the first one.(4'x4') You would do that along the whole entire roof. if it was installed by the method of stacking,(no offset)
that is wrong. When the company told you that it was normal was they with you looking at your home? The reason I ask is usually during late fall thru febuary the shingles conform to how they were shipped and loaded..,I am not making excuses by any means.,Sometimes after a new install during winter months it takes twice the time to lay down and conform to your roof and that may have been the reason they had said that to you. But if they were looking at the house and said that then they were snowballing you. Also if they were not the installers of the plywood then they cannot be held 100% accountable for that,.but they should assume most of the blame and the reason I say that is they were to provide a service for you in a professional manner.,When and if they noticed it then you should have been contacted immediately and given the option to correct it before the shingles were installed, its sorta like taking your car to a dealership for service like changing the oil and the guy changing your oil whille putting the car on the racks had noticing that 3 out of 4 of your tires have wire coming thru and taking your money for the oil change and saying nothing about the tires.Yes H-clips should have been used, the clips keep the plywood around 1/8"-1/4" apart for several reasons one being during the seasons the plywood expands and constricts and if the gap isn't there then they buckle and contort.Also its gapped because your house is always shifting,so naturally the gaps are needed.And unless that plywood/O.S.B was in the rain for several days of constant rain it would be o.k because according to the plywood institute
they actually think its better for O.S.B to get wet a couple times due to the fact that if clips are not used and the plywood was installed then when it dries out it can expand.and buckle too.Lack of ventilation can also cause the plywood to sweat underneath and dry out and buckle.Yes, the shingles look like some of lowes material.From may view they do look like some owens corning classics, which are 20yrshingles, and as far as the water running down the siding it very well could have been a blow thru on the edge, a blow thru happens majority of the time in the winter months and the nail blasts thru the shingle because of the cold and not paying attention to air pressure., and if I were you have someone unaffiliated with the contractor and look between the seams of the plywood and make sure felt was used.

Sorry for the novel

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