Section 09 22 23:
Portland Cement Stucco
Part 1 - General
Section Includes: Installation of the Portland cement stucco as an exterior wall cladding. The extent of stucco base and finish coat assembly is as indicated on the drawings. This system is to be mechanically attached over CMU, Studs and Sheathing and ICF.
The types of stucco base coat assembly include:
Factory blended, fiber-reinforced cement plaster basecoat for jobsite mixing to provide scratch and brown coats to receive secondary fiberglass crack suppression reinforcement and a cement colored stucco finish.
Products installed but not supplied under this section:
Joint Sealant: Refer to Division 7 Joint Treatment (Sealants) Section. Installation of joint sealant shall be by coating applicator or a separate installer. Joint sealant installer shall be experienced and competent in the installation of elastomeric construction sealants.
Scratch and Brown Concentrate fiber reinforced stucco that is a factory blended formulation of Portland cement, lime, fibers, and proprietary ingredients. For use with jobsite added ASTM C-897 stucco sand and clean potable water.
Scratch and Brown Functional Criteria:
Stucco application shall be sloped a minimum of 4"/12" (150 positive drainage.
Sheathing substrates shall be sound, dry, and free of dust, dirt, and other contaminants.
Substrate Dimensional Tolerances: Flat with V4 inch (6.4 mm) within any 4 foot (1219 mm) radius to maintain a uniform thickness of basecoat material.
Maximum deflection of substrate assembly under positive or negative design loads shall not exceed L/360 of span.
Continuous expansion jOints shall be installed at all areas of dissimilar materials, multiple story plate lines, or existing engineered through wall expansion jOints.
Per ASTM C 1063, "Expansion and or contraction joints shall be installed in walls not more than 144 ft2 (9.30 m2) in area and not