1. Select paragraph above or below for masonry weeps; below offers greater opportunity for cavity to pressure equalize. B. Mesh Weep/Vent: Free-draining mesh; made from polyethylene strands, of length required to extend from exterior face of stone to cavity behind, in color selected from manufacturer's standard. C. Cavity Drain Material: Recycled polyester/polyethylene mesh trapezoidal shaped to maintain cavity air flow and drainage while suspending mortar droppings at unequal heights. D. Reinforcing Bar Positioners: Wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from 0.148-inch steel wire, hot-dip galvanized after fabrication. Provide units designed for number of bars indicated. E. Masonry Cleaner: 1. Detergent type cleaner selected for each type of masonry used. 2. Acid cleaners are not acceptable. 3. Use soap-less type specially prepared for cleaning brick or concrete masonry as appropriate. PART 3 - EXECUTION 3.1 JOB CONDITIONS A. Protection: 1. tops of walls with non-staining waterproof covering, when work is not in progress; secure to prevent wind blow off. 2. On new work protect base of wall from mud, dirt, mortar droppings, and other materials that will stain face, until final landscaping or other site work is completed. B. Cold Weather Protection: 1. Masonry may be laid in freezing weather when methods of protection are utilized. 2. Comply with MSJC and and Cold Weather Masonry Construction “Hot Manual”. 3.2 CONSTRUCTION TOLERANCES A. Lay masonry units plumb, level and true to line within the tolerances as per MSJC requirements and as follows: B. Maximum variation from plumb: 1. In 3,000 mm (10 feet) - 6 mm (1/4 inch). 2. In 6,000 mm (20 feet) - 10 mm (3/8 inch).
1. Select paragraph above or below for masonry weeps; below offers greater opportunity for cavity to pressure equalize. B. Mesh Weep/Vent: Free-draining mesh; made from polyethylene strands, of length required to extend from exterior face of stone to cavity behind, in color selected from manufacturer's standard. C. Cavity Drain Material: Recycled polyester/polyethylene mesh trapezoidal shaped to maintain cavity air flow and drainage while suspending mortar droppings at unequal heights. D. Reinforcing Bar Positioners: Wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from 0.148-inch steel wire, hot-dip galvanized after fabrication. Provide units designed for number of bars indicated. E. Masonry Cleaner: 1. Detergent type cleaner selected for each type of masonry used. 2. Acid cleaners are not acceptable. 3. Use soap-less type specially prepared for cleaning brick or concrete masonry as appropriate. PART 3 - EXECUTION 3.1 JOB CONDITIONS A. Protection: 1. tops of walls with non-staining waterproof covering, when work is not in progress; secure to prevent wind blow off. 2. On new work protect base of wall from mud, dirt, mortar droppings, and other materials that will stain face, until final landscaping or other site work is completed. B. Cold Weather Protection: 1. Masonry may be laid in freezing weather when methods of protection are utilized. 2. Comply with MSJC and “Hot and Cold Weather Masonry Construction Manual”. 3.2 CONSTRUCTION TOLERANCES A. Lay masonry units plumb, level and true to line within the tolerances as per MSJC requirements and as follows: B. Maximum variation from plumb: 1. In 3,000 mm (10 feet) - 6 mm (1/4 inch). 2. In 6,000 mm (20 feet) - 10 mm (3/8 inch).
VANCA042000.docx