As luck would have it, so far we're dont have SHB "yet" !
The shingles are just for weed control.
I have read that SHB will travel a great distance to reach soil, I have forgot, but it seems from the article something like they had been observed crossing a hard surface 20 ft. to get to soil.
I may have found article thru a Google search.
Good Luck
Bee-Bop