Archictural shingle issues: cause?

[Joe Funderburk, CMI]

6 year old roof. Note the spider-web crack...what would cause that?

[Robert Ernst]

How was the venting?

[Joe Funderburk, CMI]

Also, how seriously would your concern be about the lack of adhesion I found in many areas and the differences in exposure?

[Joe Funderburk, CMI]

Originally Posted by rernst1

How was the venting?

6 year old house..good ventilation. Soffit vents, ridge vents and a thermostatically controlled fan.

[Robert Ernst]

Could be a bad batch of shingles? I've heard of that this is sometimes a cause of spider web cracks.

[Brian A. MacNeish]

Originally Posted by rernst1

Could be a bad batch of shingles? I've heard of that this is sometimes a cause of spider web cracks.

Not bad batches but cutting quality. I have been seeing this for years now. I'm telling people if they get 15-20 years out of their 25 and 30 year warranty shingles, be happy!

About 2002/3, IKO had a product statement about this available on the web for their Renaissance XL shingles. A couple of years ago, they re-named the shingle the GXL.....I joked to a company rep at a home show "Does that G represent a GOODER XL?"...he wasn't impressed.

http://www.classaction.ca/actions/pr...-shingles.aspx

[Joshua L. Frederick]

Look like Certainteed

[David C. Macy]

I have come across many roofs with this similar cracking and it is typically a manufacturer defect and it is often Certainteed shingles, usually in the 10-15 year range. This could be under the manufactures warranty, unless it was installed wrong.

[Doug Edwards]

At least in some of the photos it appears the shingles were improperly installed. The top of the slits in the tabls is showing....too much reveal. That area should be covered by the next course of shingles. The dark areas would normally not show. I recently called out a roof for this and it was determined that the shingles were in fact defective and installed wrong. The failure to seal is another indicator, especially after 6 yrs. Not to mention it looks like Fido's behind as well.

[bjones5]

In addition to what Doug states, also notice in the second picture of Joe's 2nd post, that some of the shingles don't line up at all. Not a good install at all.

[Gary Farnsworth]

I see a lot of cracking on newer Owens-Corning shingles. Had one a month ago that was 9 years old, so bad that insurance company would not insure it. I sent pictures to Kenton Shepard.

[Brian A. MacNeish]

Originally Posted by gfarnsworth

I see a lot of cracking on newer Owens-Corning shingles. Had one a month ago that was 9 years old, so bad that insurance company would not insure it. I sent pictures to Kenton Shepard.

Have seen the cracking on newer roofs in the 5-9 year range.

[Sean Fogarty]

The photos are of three tabs that are textured to look like arcs. They are all crap. All the ones I have seen get blisters or crack. I inquired with a friend who has done roofing a long time and he said thay are all garbage. they wear out prematurely..

[Joe Funderburk, CMI]

Originally Posted by sfogarty

The photos are of three tabs that are textured to look like arcs. They are all crap. All the ones I have seen get blisters or crack. I inquired with a friend who has done roofing a long time and he said thay are all garbage. they wear out prematurely..

I believe you are right, Sean. I missed that. Thanks.

[Jackie R. Minchey]

As a former roofer, cracks can be caused by faulty shingles or, installing in low tmepratures, bending the shingles can cause cracks such as that, used to take the ridge and valley shingles that I knw woild have to be vent and put them in a warm place prior to installing...