![]() ![]() 7.11.4.1 Control joints shall be installed to delineate areas not more than 144 square feet in walls and not more than 100 square feet in horizontal applications. ![]() Some of the key items found in this standard include:Ĭontrol Joints. ![]() ASTM C 1063 ASTM C 1063 "Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster." Additional discussions with the contractor did verify the anticipated large differential.ĪSTM C 926 covers the stucco materials, the application, the curing and in the appendix it discusses bonding agents. Either the contractor was planning to provide a substandard installation on the stud application or he was making additional profit for the application of stucco on the solid substrate. ![]() The requirements are so different that one of two things may have occurred. Recently, a CPA firm was considering building a new office and a contractor priced the stucco application for a stud wall and a solid wall at the same price. The cost of stucco applied directly to a solid substrate is always less than on a non-solid substrate due to the additional metal base requirement and the additional thickness requirement for stucco on the metal base. The additional thickness of stucco on metal base is required to attain the desired hardened cementations properties. However, on metal base the thickness is 7/8 inch. The thickness of stucco on a solid substrate is 5/8 or 1/2 inch. There is a world of difference between installation on a solid substrate and a metal base. The requirement for the metal base is covered in ASTM C 1063. However, non-solid surfaces, such as steel stud or wood framing, require a metal base be installed prior to the application of the stucco. It should be noted that less than 5.2, solid surfaces (block or concrete) may have stucco applied directly on the solid surface if they achieve bond with the stucco. ASTM C 926 The first standard is ASTM C926 "Standard Specification for Application of Portland Cement Based Plaster (Stucco)." ![]()
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