# What would cause this damage? **URL:** \ **Category:** Roofing Inspections\ **Created:** [April 3, 2015, 9:51pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419 "2015-04-03T21:51:17Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![sfetty](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sfetty/32/331195_2.png) [@sfetty](https://forum.nachi.org/u/sfetty)\ **Post date:** [April 3, 2015, 9:51pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/1 "2015-04-03T21:51:17Z")
Found this on an inspection yesterday. it was mostly a hip roof and all faces were equally damaged widespread throughout the roof. Thanks for any input. ![damaged shingles.jpg](https://global.discourse-cdn.com/internachi/original/3X/d/6/d6d6f3173e9070cad3eb78442f97289daea9e982.jpeg) ---
**Author:** ![rwelch](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rwelch/32/858_2.png) [@rwelch](https://forum.nachi.org/u/rwelch)\ **Post date:** [April 3, 2015, 9:52pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/2 "2015-04-03T21:52:35Z")
Looks like a manufacturers defect. ---
**Author:** ![sfetty](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sfetty/32/331195_2.png) [@sfetty](https://forum.nachi.org/u/sfetty)\ **Post date:** [April 3, 2015, 9:54pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/3 "2015-04-03T21:54:21Z")
Hundreds of areas like this random all over the roof. ![damaged shingles (1).jpg](https://global.discourse-cdn.com/internachi/original/3X/4/b/4bd367656f958ccbaaff6dd2737ce4d60b3274a6.jpeg) ---
**Author:** ![sfetty](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sfetty/32/331195_2.png) [@sfetty](https://forum.nachi.org/u/sfetty)\ **Post date:** [April 3, 2015, 9:55pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/4 "2015-04-03T21:55:43Z")
Just one area like this observed. ![damaged shingles (2).jpg](https://global.discourse-cdn.com/internachi/original/3X/3/a/3a873d1816a91ea531d6b363ba197ede4057c90e.jpeg) ---
**Author:** ![rlewis5](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rlewis5/32/337040_2.png) [@rlewis5](https://forum.nachi.org/u/rlewis5)\ **Post date:** [April 3, 2015, 10:01pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/5 "2015-04-03T22:01:55Z")
> [@rwelch](#): > > Looks like a manufacturers defect. that’s what it’s looking like. Unless they laid the shingles cockeyed before installation and adhesive strip tore off the granular surface. ---
**Author:** ![sfetty](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sfetty/32/331195_2.png) [@sfetty](https://forum.nachi.org/u/sfetty)\ **Post date:** [April 3, 2015, 10:25pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/6 "2015-04-03T22:25:35Z")
_Thanks Reece and Roy, anyone else have any thoughts?_ ---
**Author:** ![rwelch](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rwelch/32/858_2.png) [@rwelch](https://forum.nachi.org/u/rwelch)\ **Post date:** [April 3, 2015, 10:39pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/7 "2015-04-03T22:39:01Z")
Here’s a similar defect that is a little more pronounced. Are you seeing this, but smaller? ![DSCN6179.JPG](https://global.discourse-cdn.com/internachi/original/3X/1/d/1d1eff9b2a9ee5b625059578e7b1f36a8bbf1a08.jpeg) ---
**Author:** ![sfetty](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sfetty/32/331195_2.png) [@sfetty](https://forum.nachi.org/u/sfetty)\ **Post date:** [April 3, 2015, 11:38pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/8 "2015-04-03T23:38:56Z")
Just the one post photo close to that scale most damage was about the size of a “tootsie roll” in size. ---
**Author:** ![mclark2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mclark2/32/170907_2.png) [@mclark2](https://forum.nachi.org/u/mclark2)\ **Post date:** [April 4, 2015, 9:37pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/9 "2015-04-04T21:37:20Z")
Installers wearing baseball cleats for traction on the roof? ---
**Author:** ![jspencer](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jspencer/32/172267_2.png) [@jspencer](https://forum.nachi.org/u/jspencer)\ **Post date:** [April 6, 2015, 2:31am UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/10 "2015-04-06T02:31:07Z")
Instead of throwing them off the roof, the installer might have thrown his cut pieces on the new shingles, with the sealant strip facing down. When they went to clean up, the granules came up were they were stuck to the sealant strip. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [April 10, 2015, 1:28pm UTC](https://forum.nachi.org/t/what-would-cause-this-damage/95419/11 "2015-04-10T13:28:24Z")
#1 and #3 are defects similar to blisters where the asphalt layer has separated at the interface with the mat, just like it does with blisters. It appears to be an asphalt quality issue, meaning impurities in the asphalt. #4 looks like spliced shingles. Spliced shingles are created to keep the production line moving, but are supposed to be thrown out. Given the quality of the asphalt, I guess it’s not surprising that they’re including spliced shingles in their bundles. In any case the shingles are defective.