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<br />Copyright 2005 AIA <br /> <br />MASTERSPEC Short Form <br /> <br />08/05 <br /> <br />1. Rinse joint surfaees with water to remove dust and mortar particles. Time rinsing <br />application so, at time of pointing, joint surfaces are damp but free of standing water. If <br />rinse water dries, dampenjoint surfaces before pointing. <br />2. Apply pointing mortar fIrst to areas where existing mortar was removed to depths greater <br />than surrounding areas. Apply in layers not greater than 3/8 inch (9 mm) until a uniform <br />depth is formed. Fully compact each layer thoroughly and allow it to become thumbprint <br />hard before applying next layer. <br />3. After low areas have been filled to same depth as remaining joints, point all joints by <br />placing mortar in layers not greater than 3/8 inch (9 mm). Fully compact each layer and <br />allow to become thumbprint hard before applying next layer. Where existing stone has <br />worn or rounded edges, slightly recess fmished mortar surface below face of stone to <br />avoid widened joint faces. Take care not to spread mortar beyond joint edges onto <br />exposed stone surfaces or to featheredge the mortar. <br />4. When mortar is thumbprint hard, tool joints to match original appearance of joints as <br />demonstrated in approved mockup. Remove excess mortar from edge of joint by <br />brushing. <br />5. Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive <br />hours, including weekends and holidays. <br /> <br />a. Acceptable curing methods include covering with wet burlap and plastic sheeting, <br />periodic hand misting, and periodic mist spraying using system of pipes, mist <br />heads, and timers. <br /> <br />6. Hairline cracking within the mortar or mortar separation at edge of a joint IS <br />unacceptable. Completely remove such mortar and repoint. <br /> <br />F. Where repointing work precedes cleaning of existing stone, allow mortar to harden at least 30 <br />days before beginning cleaning work. <br /> <br />3.10 FINAL CLEANING <br /> <br />A. After mortar has fully hardened, thoroughly clean exposed stone surfaces of excess mortar and <br />foreign matter; use wood scrapers, stiff-nylon or -fiber brushes, and clean water, spray applied <br />at low pressure. <br /> <br />1. Do not use metal scrapers or brushes. <br />2. Do not use acidic or alkaline cleaners. <br /> <br />END OF SECTION 04902 <br /> <br />STONE RESTORATION AND CLEANING <br /> <br />04902 - 16 <br />