What do these numbers mean on the roof? Is there a manufacture date to these numbers?
Just looks like a lot / run number to me for the material. You often see the same types of printing on the paper wrap on shingle bundles.
they are inconsequential. Try not to get wrapped up in things that don’t matter.
Material Lot numbers.
Its alining the lot number to the manufacture. (IKO, BP, DOMTAR, CERTIANTEED etc.)
Mark them in you files.
Once you know the manufactures, see if there are a class action suites pending on that lot or batch number.
I am going to a roofing and metal fabrication supplier I have used for 30 years for information.
I will post it before the month is out.
I ask my clients to ask home owners for *** all receipts*** for warrantied items if they have them.
That is part of my SOP.