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Copyright 2005 AIA MASTERSPEC Short Form 08/05 I. Set replacement stone with completely filled bed, head, and collar joints. Butter vertical joints for full width before S{:tting and set units in full bed of mortar unless otherwise indicated. Replace existing anchors with new anchors of size and type indicated. 1. Tool exposed mortar joints in repaired areas to match joints of surrounding existing stonework. 2. Rake out mortar used for laying stone before mortar sets and point new mortar joints in repaired area to comply with requirements for repointing existing stone, and at same time as repointing of surrounding area. 3. When mortar is sufficiently hard to support units, remove shims and other devices interfering with pointing of joints. 3.3 STONE-FRAGMENT REPAIR A. Carefully remove cracked or fallen stone fragment indicated to be repaired. Reuse only stone fragment that is in sound condition. B. Remove soil, loose pmticles, mortar, and other debris or foreign material, from fragment surfaces to be bonded and from parent stone where fragment had broken off, by cleaning with stiff-fiber brush. C. Pinning: Before applying adhesive, prepare for mechanical anchorage consisting of 1/4-inch- (6-1llin-) diameter, [plain] [threaded] stainless-steel pins set into 1/4-inch- (6-mm-) diameter holes drilled at a 45-degree downward angle through face of fragment and into parent stone. Center and space pins between 3 and 5 inches (75 and 125 nun) ap:ut and at least 2 inches (50 mm) from any edge. Insert pins at least 2 inches (50 mm) into parent stone and 2 inches (50 mm) into fragment with end countersunk at least 3/4 inch (19 mm) from exposed face of fragment. D. Concealed Pinning: B€:fore applying adhesive, prepare for concealed mechanical anchorage consisting of 1/4-inch- (6-mm-) diameter, [plain] [threaded] stainless-steel pins set into 1/4- inch- (6-mm-) diameter holes drilled into parent stone and into, but not through, the fragment. Center and space pins between 3 and 5 inches (75 and 125 mm) apart and at least 2 inches (50 mm) from any edge. Insert pins at least 2 inches (50 mm) into parent stone and 2 inches (50 mm) into fragment, but no closer than 3/4 inch (19 mm) from exposed face of fragment. E. Apply stone-to-stone adhesive to comply with adhesive manufacturer's written instructions. Coat bonding surfaces of fragment and parent stone, completely filling all crevices and voids. F. Fit stone fragment onto parent stone while adhesive is still tacky and hold fragment securely in place until adhesive ha~: cured. Use shims, clamps, wedges, or other devices as necessary to align face of fragment with face of parent stone. G. Clean adhesive residue from exposed surfaces and patch chipped areas[ and exposed drill holes] as specified in "Stone Patching" Article. STONE RESTORATION AND CLEANING 04902 - 10