Roll of insulation (Scotts Valley by Vine Hill Rd.)

I have a partial roll of Knauf insulation, 15 inches wide.

Conservatively estimated to be 21 feet, based on the formula for circumference, and using the average diameter of the roll times the number of wraps on the roll.
(Sorry, I'm not about to unroll it and get all itchy from the fiberglass. But I'm confident in my pi based estimate.)

The R-value is not marked on it, and our handyman bought it before he disappeared (hope he's ok!) so I don't really know the R-value.
We should assume it's R-13, since that's the lowest R-value Home Depot currently has in a similar 15 inch wide roll (which is a different brand, Knauf is not currently stocked in roll form at Home Depot.)

We’ll meet at the Starbucks closest to my house. Because the turnoff from 17 to my house is hard to find, and sketchy once you do find it.
That would be the Starbucks at:
5600 Scotts Valley Drive in Scotts Valley.

Thanks for keeping stuff out of the landfill!
Wex