Specifications include, but are not limited to: (1) All exterior brick, stone and terra cotta surfaces shall be washed with pressurized water at approximately 1000 PSI. Where necessary to remove stubborn stains, a chemical cleaning agent shall be applied to the surface, allowed to dwell, and then rinsed in accordance with the manufacturer’s specifications. The chemical cleaning agents shall be applied no more than two times to any masonry surface. (2) A careful inspection of all mortar joints shall be completed and joints that are found to be void, open or defective shall be cut back to a depth ¼-inch deeper than the width of the joints, or to sound backing. All cut mortar joints and face of masonry shall be cleaned with air and/or water pressure to remove any loose or foreign residue. (3) Defective mortar joints that have been cut and cleaned shall then be pointed (filled and tightly packed) with a non-staining, non-shrinking, Type “N” masonry pointing mortar, colored and tooled to match the adjacent joints in appearance as closely as possible. Prior to installing the new mortar, the masonry surfaces shall be thoroughly wet, with no standing water (saturated surface dry). (4) All horizontal wash joints on the copings, water tables, and exterior window perimeter sealants of all windows shall have the existing materials cut back to a depth of approximately ½- inch, cleaned of all dust, dirt and loose debris. All joints shall have bond breaker tape or foam backer rod installed to prevent three-sided adhesion. The joints shall then be resealed utilizing a polyurethane sealant, Masterseal NP100 or equal. New sealant shall be tooled to a neat, uniform appearance and shall match the original material in color as closely as possible.
