# Unidentified roofing material **URL:** \ **Category:** Roofing Inspections\ **Created:** [June 12, 2025, 6:17pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069 "2025-06-12T18:17:53Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![jbirtwell](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jbirtwell/32/250166_2.png) [@jbirtwell](https://forum.nachi.org/u/jbirtwell)\ **Post date:** [June 12, 2025, 6:17pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/1 "2025-06-12T18:17:53Z")
Hi All, Pre-certified inspector here. I was on an inspection recently and came across this sublayer of a roof. I did not recognize the material.Can anyone identify what this material is? does? It was not metal and had a cloth like feel. The material repeated every 4-5 feet up the side of the roof along the transition to the side wall on both sides of the house. I am so grateful for this resource and everyone who participates. Thank you! Justin I added more photos. ![20250611_131731](https://global.discourse-cdn.com/internachi/original/4X/e/a/6/ea6b97978726c2d4ac9158f21772272f443ada7b.jpeg) ![20250611_135225](https://global.discourse-cdn.com/internachi/original/4X/7/5/7/757a47afe1eb7539a6e0e3da41cf55cfb2e375fa.jpeg) ![20250611_131934](https://global.discourse-cdn.com/internachi/original/4X/f/0/a/f0a66499948af30c54f58bf875011957c0337452.jpeg) ---
**Author:** ![bcawhern1](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bcawhern1/32/408713_2.png) [@bcawhern1](https://forum.nachi.org/u/bcawhern1)\ **Post date:** [June 12, 2025, 6:20pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/2 "2025-06-12T18:20:43Z")
That’s all we get? More photos please. Close and far. We need more context. ---
**Author:** ![jjonas](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jjonas/32/301755_2.png) [@jjonas](https://forum.nachi.org/u/jjonas)\ **Post date:** [June 12, 2025, 6:38pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/3 "2025-06-12T18:38:54Z")
> [@bcawhern1](#): > > We need more context. Including where (climate / Ice / snow / etc.) you are located. Considering the proximity to the sidewall, and what appears to be another “exposure” about 4+ feet above the one shown, I assume it is a half-assed attempt as a flashing/ice shield of sorts! ---
**Author:** ![kleonard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kleonard/32/170953_2.png) [@kleonard](https://forum.nachi.org/u/kleonard)\ **Post date:** [June 12, 2025, 6:46pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/4 "2025-06-12T18:46:30Z")
> [@jbirtwell](#): > > Can anyone identify what this material is? does? It was not metal and had a cloth like feel. It looks like it could be the synthetic roof underlayment that has a section that’s overlayed on the top of the shingles. Unless I could come up with a legitimate reason why it would be installed like that, I would call it out as an improper installation. ---
**Author:** ![ndegaris](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/ndegaris/32/410567_2.png) [@ndegaris](https://forum.nachi.org/u/ndegaris)\ **Post date:** [June 12, 2025, 6:47pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/5 "2025-06-12T18:47:07Z")
I was leaning towards zinc strip for moss control, but seems like an odd place to put it? ---
**Author:** ![jbirtwell](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jbirtwell/32/250166_2.png) [@jbirtwell](https://forum.nachi.org/u/jbirtwell)\ **Post date:** [June 12, 2025, 7:02pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/6 "2025-06-12T19:02:35Z")
Sorry. I appreciate your patience. I added more photos. FYI, The material repeated every 4-5 feet up the side of the roof along the transition to the side wall on both sides of the house. ---
**Author:** ![bcawhern1](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bcawhern1/32/408713_2.png) [@bcawhern1](https://forum.nachi.org/u/bcawhern1)\ **Post date:** [June 12, 2025, 7:06pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/7 "2025-06-12T19:06:05Z")
I think you have a legitimate question. It is not a typical installation and is most likely a repair attempt. Next, consider the consequences. What do you think they may be? ---
**Author:** ![jbirtwell](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jbirtwell/32/250166_2.png) [@jbirtwell](https://forum.nachi.org/u/jbirtwell)\ **Post date:** [June 12, 2025, 7:18pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/8 "2025-06-12T19:18:34Z")
I’m located in CT. ---
**Author:** ![jjonas](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jjonas/32/301755_2.png) [@jjonas](https://forum.nachi.org/u/jjonas)\ **Post date:** [June 12, 2025, 7:27pm UTC](https://forum.nachi.org/t/unidentified-roofing-material/257069/9 "2025-06-12T19:27:26Z")
I suspect they had leakage issues at that wall transition, and had the siding and shingles replaced, and upgraded the underlayment as a precaution. > **[Titanium UDL 30 Synthetic Roof Underlayment – Reliable, Weather-Resistant](https://homeimprovementsupply.com/p-11-titanium-udl-30-synthetic-roof-underlayment.aspx?vid=11&utm_source=Google&utm_medium=Product_CPC&utm_campaign=11&gad_source=1&gad_campaignid=222351809&gbraid=0AAAAADhnfVeaSwAu0k2OPzt_mi3crtkX8&gclid=CjwKCAjw9anCBhAWEiwAqBJ-czhdeM24oJ3YS3qwp5Ram51cjApsmmw_1WP9Z9EN455RstJvgObicBoCaA0QAvD_BwE)** > > Titanium UDL 30 Synthetic Underlayment – lightweight, slip-resistant, and UV-rated, offering reliable protection in all weather conditions.