Torn or Split Shingles?

[William Kievit]

What are the possible causes for the vertical splits in these shingles?
3204132042

[Jim Luttrall]

What are the possible causes for the vertical splits in these shingles?
3204132042
Looks like the sheathing has moved and torn the shingles in one photo, maybe the same in the other photo but almost looks too clean of a split for a random tear even if along a seam.
Any other indications of shifting roof sheathing; foundation repair, attic framing repair, etc.?

[John Dirks Jr]

A wide angle picture of the house might help. Maybe its a point in the structure where an addition connects to the original structure. Any difference in slight movement between the connected structures could cause that if the shingles are older and brittle.

[Mark Reinmiller]

Expansion/contraction of the roof sheathing. This was a real common problems many years ago when fiberglass shingles were a relatively new thing. Don't see it much any more. I think APA has a download discussing this. There is a lot of info out there about this problem.

[Mark Reinmiller]

Expansion/contraction of the roof sheathing. This was a real common problems many years ago when fiberglass shingles were a relatively new thing. Don't see it much any more. I think APA has a download discussing this. There is a lot of info out there about this problem.

[Ronald Betschman CFDI,CML]

One other idea to consider is damage from excessive snow and ice load. Carefully check the framing members. Luck may have been one someone's side!

[Frank Adame]

Check out haageducation.com.

[Don Putnam]

Looks like the sheathing has moved and torn the shingles in one photo, maybe the same in the other photo but almost looks too clean of a split for a random tear even if along a seam.
Any other indications of shifting roof sheathing; foundation repair, attic framing repair, etc.?

Jim, this looks like what happens when the decking is not staggered, resulting in a continuous vertical decking joint. When this is observed at only one location it usually indicates a tie in to an addition. When it occurs at more than one location it may indicate decking installed over the entire affected area without staggered joints, in which case the splits will occur either 4' or 8' apart.

Don Putnam
www.roofconsulting.com

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What are the possible causes for the vertical splits in these shingles?
3204132042

Sorry, I meant to address my previous post to you, William.

Don Putnam
www.roofconsulting.com

[Rocket Gal]

Could be movement of substrate under the shingles. Depending upon age of the house, is there old planking under the shingles? Expansion and contraction underneath the shingles could have stressed them vertically over 10 years or so like this.

[Steve Duchene]

GAF Woodline and Timberline had a manufacturing defect and these appear to be part of that warranty issue though the Woodline grade were phased out in the mid to late 90's.