When required by ASTM C 926, Section 5.2.2 an exterior bonding agent, conforming to ASTM C 932, shall be used on all masonry surfaces.Three-coat systems consist of: first coat = 1/4 inch thick, second coat = 1/4 inch thick, and finish coat = 1/8 inch thick over both masonry and cast concrete. Two-coat systems over masonry consist of: first coat = 3/8 inch thick and finish coat = 1/8 inch thick or over cast concrete consist of: first coat = 1/4 inch thick and finish coat = 1/8 inch thick. Conventional stucco over masonry surfaces may be applied with two or three coats.This document is meant to be used as a guide to address some of the common installation and proper application issues found during field inspections. This document is not all inclusive and does not cover all the requirements for compliant installation of stucco. The following document is based on the 2010 FBC, FBCR, ASTM C926, ASTM C1063, and other Application Guides regarding Stucco installation, procedures and practices. ![]() ![]() Stucco Installation, Procedures and Guidelines Image Source: Kirk Giordano Plastering Inc.
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