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LATH & PLASTER Section 09200 15-1207 1. Apply welded wire lath with long dimensions at right angles to studs with true even surfaces and without sags or buckles in accordance with ASTM C847. Attach with fasteners at 6 inches o.c. to each stud. All upper sheets shall overlap lower sheets per ASTM 1063. Stagger vertical laps. Do not penetrate paper with wire when wire tying side laps. Metal lath shall be furred out from vertical supports a minimum of 1/4". C. Reinforce interior corners with Interior Corner Reinforcement. Fasten as recommended by manufacturer. Interior Corner Reinforcement may be omitted where metal lath turns at least 3 inches past corner to form angle reinforcement. D. Reinforce exterior corners with Exterior Corner Bead. Fasten as recommended by manufacturer, spaced not less than 18 -inches on center. E. Reinforce door and window openings with Strip Lath applied a minimum of 8 inches diagonally, each direction, from point of corner. F. Install Casing Bead where plaster finish terminates, where plaster adjoins other materials and around all wall openings. Install additional Casing Bead as indicated in drawings. G. Control Joints, Expansion Screeds and Adjustable Expansion Joints: Locate Control Joints, Expansion Screeds, Adjustable Expansion Joints, and other accessories as indicated on the drawings. Where Control Joints are not specifically indicated on drawings, the applicator is required to install them as required to create panel sizes not exceeding 100 square feet (144 sq. ft. if over rigid insulation substrate). Panels shall be as close to square in configuration as possible, with maximum panel lengths of 12 feet. Panel sizes shall not to exceed a 2-1/2 to 1 ratio, width to height. Unless otherwise noted, Control Joints may be applied over continuous lath. Coordinate exact locations with Architect. H. Ease exposed corners and sharp edges. Touch up painted finish as required. Provide electrolytic protection between aluminum plaster accessories and metal lath by means of building paper or felt inserted and fastened between. 3.06 PLASTER APPLICATION — WOOD A. Apply plaster in accordance with ASTM C926 and ESR -2535. B. Plaster System Thickness: Per ASTM C926, as follows: Application Nominal Thickness (inches) Scratch Coat Brown Coat Finish Coat Vertical 3/8* 3/8 1/8 Horizontal 1/4* 3/8 1/8 " Thickness is measured from back face of lath to face of scratch coat, although sufficient material must be distributed and extend through back face of lath for proper adhesion and keying of material. 11