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Round 1 Bowling and Amusement 12/09/2024 Paradigm Design <br />Main Place Mall Expansion Grand Rapids, MI <br />Santa Ana, California <br />Project #2309147GR <br />GYPSUM BOARD 09 2900 - 5 <br />2.5 TRIM ACCESSORIES <br />A.Interior Trim: ASTM C1047. <br />1.Material: Galvanized or aluminum-coated steel sheet or rolled zinc. <br />2.Shapes: <br />a.Cornerbead. <br />b.Bullnose bead. <br />c.LC-Bead: J-shaped; exposed long flange receives joint compound. <br />d.L-Bead: L-shaped; exposed long flange receives joint compound. <br />e.U-Bead: J-shaped; exposed short flange does not receive joint compound. <br />f.Expansion (control) joint. <br />g.Curved-Edge Cornerbead: With notched or flexible flanges. <br />2.6 JOINT TREATMENT MATERIALS <br />A.General: Comply with ASTM C475/C475M. <br />B.Joint Tape: <br />1.Interior Gypsum Board: Paper. <br />2.Glass-Mat Gypsum Sheathing Board: 10-by-10 glass mesh. <br />3.Tile Backing Panels: As recommended by panel manufacturer. <br />C.Joint Compound for Interior Gypsum Board: For each coat, use formulation that is compatible with <br />other compounds applied on previous or for successive coats. <br />1.Prefilling: At open joints, rounded or beveled panel edges, and damaged surface areas, use <br />setting-type taping compound. <br />2.Embedding and First Coat: For embedding tape and first coat on joints, fasteners, and trim <br />flanges, use setting-type taping compound. <br />a.Use setting-type compound for installing paper-faced metal trim accessories. <br />3.Fill Coat: For second coat, use setting-type, sandable topping compound. <br />4.Finish Coat: For third coat, use drying-type, all-purpose compound. <br />D.Joint Compound for Tile Backing Panels: <br />1.Glass-Mat, Water-Resistant Backing Panel: As recommended by backing panel manufacturer. <br />2.Cementitious Backer Units: As recommended by backer unit manufacturer.