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Post by maxwellsmart007 on May 25, 2010 7:37:19 GMT -6
I just looked out my upstairs window, and saw that on one stretch of the roof - the flatter part at the back - the shingles are beginning to cup...
I just had 35 year shingles installed on it last year. They shouldn't be cupping already....how much cupping is ok?
There's no vents in this roof, and likely no insulation below - coupled with a Canadian winter, that likely means that they're going to cup before their time....but less than a year?
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Post by TDHofstetter on May 25, 2010 8:03:33 GMT -6
These are three-tab strip shingles, right? Like IKO? Strips about one meter long?
Is this in a heavily shaded area? If so, the shingles may never have gotten hot enough to stick down to the stick-down stripes... and each cupping tab may need some help with a little dab of blind nailing cement underneath. It's not any kinda' good idea to nail through 'em unless you're wiling to cover each nailhead with a dot of cement, too... and that winds up lookin' polka-dotty.
If this area gets full sun, then the stickdown stripe may be missing from these shingles... if that's true, ya got two options: Replace all the shingles (!) or put blind nailing cement under EVERY tab.
They gotta' be made not to cup. Otherwise, they'll dry out far before their time & break off & you'll have a buncha' missing shingles.
Just how flat IS this area? How long, how much rise in that distance?
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Post by imahic on May 26, 2010 21:43:06 GMT -6
The poor ventilation probably has something to do with it but in only a year I wouldn't think it would affect it that soon. I think I would be contacting a factory rep about their warranty. Course they may hit you with that ventilation thing also. Are we talking cupping or curling? Either way I would think 35 yr shingle would last longer than that.
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Post by deathwish on May 26, 2010 22:19:30 GMT -6
Does it have a laminated tab? Is that what is cupping?
If it's the laminated portion, below the seam, that's more 'decorative' and not a huge deal.
or
Is it the 'base' part of a laminated shingle? Or a standard 3-tab?
If it is a standard 3-tab . . . it's a big deal no matter what.
Could mean they were installed improperly . . . plastic strip (if present) not 'peeled' off the tar strip, too close together (if installed cold, this can be an more visible on a hot day due to expansion).
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