Time to re-shingle my roof. Most of my shingles are just worn out, but over my 140′ X 10’porch, they are all curled up and deformed. The house has ventilation and the shingles are good. The porch is open under the roof with no insulation. I would think it would be cooler under the porch roof than it would in the air space between the insulation and the shingles on the house. Why are the shingles curling and how could I remedy the problem? The porch has a 4/12 while the house is a 6/12…does that have anything to do with it?
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Where do you live, what is the exposure (NEWS) of these shingles, what brand are they, how old are they?
Some shingles are just plain defective and curl as you describe.
Western New York State...south of Buffalo. Lots of snow! IKO asphalt shingles that are 21 years old. They have been curling for a couple years. The odd thing is that they are curling over the porch roof and not the rest of the house.
21 years old they are likely at or near the end of their useful lifespan.[email protected]
Yes, but he's wondering why just the porch and not the rest of the house.
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How the heck am I supposed to know the answer to that? ;)[email protected]
Yeah, 21 years is more than you should expect from most shingles, so any curling isn't a big worry. But they may curl worse because of the angle of sun exposure or because moisture is leaking under them (in addition to the possibility of a bad batch).
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Since we are all guessing, here is mine.
I have noticed that the greatest curling on old roofs is on lower pitched roofs and on some of these roofs the curling is so pronounced as to create little pools that actually hold water after a rain. My theory is that a lower pitched roof has a tendency to retain a little more water after a rain and the drying and wetting cycle causes the top surface of the shingle to shrink a little more over time. Thus causing the curling.
The angle at which they face the sun in the hottest part of sumer can effect aging. I presume that if these were installed on the porch same time as on the steeper pitched roof, that has something to do with it.
But Buffalo area ( deep snow) and an unheated porch means these shingles have seen some ice damns and The runnoff from the above roof means they have acrried more water over the years than above.
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Around here the only shingles curling are made by one manufacturer. There was a class action lawsuit against them.
There might be reason for that if they curl prematurely, but curled shingles is a standard symptom of age with all asphalt composition shingles, regardless of maker.
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