What’s included Learn the material: Drywall (C-9) Study Guide Book Pass the test: Drywall (C-9) Practice Exam What this covers Per the state's classification, a C-9 contractor "installs, tapes, textures, and finishes drywall, gypsum board, and other similar rigid wallboard." This printed book covers the subjects the state tests. See the official CSLB C-9 classification. Sample questions — Try our free practice test For semisolid partitions, nailing blocks should be spaced:A. 12" · B. 16" · ✓ C. 24" · D. 30" Blocking behind the tub to support sheetrock is installed by the:A. Plumber · B. Drywall mechanic · ✓ C. Framer · D. Tile setter Which type of resistance does double-layer gypsum board provide?✓ A. Sound and fire · B. Sound and waterproofing · C. Waterproofing and fire · D. Security and sound A bugle head screw attaches multi-layer gypsum board to steel framing up to what gauge?A. 12 · ✓ B. 14 · C. 16 · D. 24 Fasteners for applying metal trim should be spaced a maximum of how many inches o.c.?A. 14" · B. 12" · C. 10" · ✓ D. 9" Finishing compound should be applied with tools of sufficient width to extend at least how many inch(es) beyond both sides of the center of the joint tape?✓ A. 6 · B. 5 · C. 4 · D. 3
