The TRI-BUILT® Cuttingedge Surface Block for Triple 3" Siding provides a durable, water-resistant mounting surface for all exterior accessories. Compatible with vinyl exterior siding. It is used for installing fixtures, after the siding is up.

TRI-BUILT® provides quality residential and commercial building materials that deliver professional results. By focusing on the professional contractor, TRI-BUILT® has become a recognized and trusted leader in the construction industry. From roofing and siding materials, windows, coatings, and more, TRI-BUILT® is a name you can trust at a competitive price.