Roofing project- Invoice & Paperwork & Documentation

[Mak K.]

Hi,

I did a new roof on a rental property. I am from Texas/Houston. The roofer gave me a invoice with high level bill of material, and a statement that it has 2 years of warranty and brand name of the shingles.

It does not say brand name warranty or model or batch number etc. 

Question What does a roofer invoice consist of? And the GAF shingles comes with 25yr warranty. Do they provide any paperwork or registration etc? Is Shingles warranty worth it or next to impossible to claim it?