Shingle defect

[Jon mackay]

This roof looked great at one side and the other had multiple areas of heavy aggregate wear.

The gutters on both sides had quite a bit of aggregate in them.

Is there a known shingle defect that would result in this condition?

I am guessing that replacement of the damaged side would be the best fix given the extent of worn areas (probably 15 - 20 % of the one side).

[H.G. Watson, Sr.]

Looks like damage not defect. Thrown rocks, hail, overhanging trees, falling nuts, (black walnut tree?), dragging branches, former roof installation (sat. tv?) or walker on larger mass area centered, etc.

[TR Platt]

Looks like a size 12 to me..

[wayne soper]

Power washer should not be overlooked.
HEY MO! KNUKNUKKNUK:D

[Nick Ostrowski]

Skylab.

[Gunnar Alquist]

This roof looked great at one side and the other had multiple areas of heavy aggregate wear.

The gutters on both sides had quite a bit of aggregate in them.

Is there a known shingle defect that would result in this condition?

I am guessing that replacement of the damaged side would be the best fix given the extent of worn areas (probably 15 - 20 % of the one side).

Is this the south side of the house? That might just be regular wear from heat and sun.

[John Kogel]

Nobody's said Hail, so I'll throw in with Hail damage.
It's a mystery, but a pressure washer in the hands of an idiot is the best answer so far.

[Eric Shuman]

That is pretty typical of hail damage in my neck of the woods and we get a lot of hail storms here. Also typical to have damage on one face of the roof and not the other as the damaged side is typically the side that the storm approached from. The angle on the leeward side of the roof has a tendency to shed the hail instead of scoring direct hits. If it is hail damage then it might have happened a while ago allowing the damaged bruised areas to shed granules and weather. That's my two cents.

[Jon mackay]

Is this the south side of the house? That might just be regular wear from heat and sun.

Yes, it is but I have never seen a roof wear like that before..

[H.G. Watson, Sr.]

Nobody's said Hail, so I'll throw in with Hail damage.

This "nobody" first responded, indicated the pictured appeared to be damage not defect; and actually made mention specifically of Hailas the second most likely cause of pictured damage (in a list of seven examples followed by an "etc.").

[Nick Ostrowski]

I'm gonna take a stab here and say it might be hail.

[John Arnold]

Just my two cents, but I was thinking it might be hail?

[Eric Barker]

I hope you guys wouldn't put some of this stuff in your reports. This is all speculation. Yes?

[Eric Shuman]

I hope you guys wouldn't put some of this stuff in your reports. This is all speculation. Yes?

Speculation yes, but here in central Texas I would call it "educated speculation" because we see a lot of hail storms. There are also usually other tell-tale signs like dented rain gutters, dented metal vents, dented condensing coil fins, and even broken windows if the hail is large enough. Another indicator is a bunch of new looking roofs on the same street.

When I see damage that resembles hail stone hits on shingles I do mention that in my reports but I phrase it something like "Possible hail stone damage, it is highly recommended that a qualified roofing contractor inspect the roof to determine repair/replacement options and costs..." or something to that effect.

Many times the sellers insurance will cover the cost of shingle replacement, that is if they haven't already made a claim and spent the money on something else. ;)