2.2.3.2
One-Part Masonry Cleaner
One-part masonry cleaners shall be the standard, acid formulation
recommended by the manufacturer.
2.2.3.3
Two-Part Limestone Cleaner
Two-part limestone cleaners shall be manufacturer's standard, two-part
masonry cleaning system consisting of an alkaline prewash cleaner followed
by acidic afterwash rinse.
2.2.3.4
Standard Strength Acidic Cleaner
Acidic cleaners shall be manufacturer's standard strength, acidic masonry
restoration cleaner composed of hydrofluoric acid blended with other acids
and combined with special wetting systems and inhibitors.
2.2.3.5
Extra Strength Acidic Cleaner
Masonry restoration extra strength acidic cleaners shall be as recommended
by the manufacturer.
2.2.4
Liquid Strippable Masking Agent
Liquid strippable masking agent shall be manufacturer's standard liquid,
film-forming, strippable masking material for protecting glass, metal, and
polished stone surfaces from the damaging effect of acidic and alkaline
masonry cleaners.
2.2.5
Spray Equipment
Spray equipment for chemical cleaners shall be low-pressure tanks or
chemical pumps suitable for chemical cleaner indicated, and shall be
equipped with stainless steel, cone-shaped spray-tip. Spray equipment for
water shall disperse water through a fan-shaped spray tip at an angle of
not less than 15 degrees. Spray equipment shall deliver water at a
pressure not greater than 3.5 Mpa 500 psi and at a volume between 9.5 and
11.4 Lpm 2.5 and 3 gpm. Spray equipment for heated water shall be capable
of maintaining temperature, at flow rates indicated, between 60 and 82
degrees C 140 and 180 degrees F.
2.2.6
Cleaning Implements
Brushes shall have natural or nylon fiber bristles only. Wire brushes
shall not be used. Scrapers and application paddles shall be made of wood
with rounded edges. Metallic tools shall not be used.
2.2.7
Water
Potable water shall be obtained from a local source and shall be filtered
to remove minerals resulting in a neutral pH, prior to application.
Backflow prevention devices shall be provided at the point of connection to
the water supply.
2.3
REPAIR MATERIALS
2.3.1
Masonry and Mortar
Masonry and mortar materials used for repair and renovation shall match the
SECTION 04900
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