2/26/2024 0 Comments Astm c1063 grabber screws![]() The disadvantage to this shape is that since there is no chemical bond of the stucco to this leg, if installed incorrectly a stucco separation crack can result at the juncture of the stucco to the leg of the bead. The other aspect of these beads that they all have in common is the sloping angular shape of the downward leg of the "M" shape. These beads all have expanded flanges for extra bonding of the bead to the lath below. This bead is designed to deal with normal initial stucco shrinkage during the hydrating and curing stage of the Portland cement stucco (generally exterior) or gypsum plaster (interior) coats and minor thermal expansion and contraction. 15 types of this joint are generally considered to be control joints by the industry. ![]() Types of control joints and their general uses: One-piece control/expansion joints: "V", "M" or No. Wall or partition height door frames shall be considered as control joints." A control joint shall be installed where the ceiling framing or furring changes direction." Finally, it states, "A control joint shall be installed where an expansion joint occurs in the base exterior wall. The distance between control joints shall not exceed 18 feet in either direction or a length-to-width ratio of 2 1⁄2 to 1. The specification continues: "Control (expansion and contraction) joints shall be installed in walls to delineate areas not more than 144 square feet and to delineate areas not more than 100 square feet for all horizontal applications, that is, ceilings, curves, or angle type structures. The separation spacing shall be not less than 1/8 inch or as required by anticipated thermal exposure range (per author and to accommodate stucco shrinkage)." It goes on to state that it has to conform to the previous section that states the following: "Lath shall not be continuous through control joints but shall be stopped and tied at each side." Such staples may be placed over ribs of 3/ 8-inch (9.5 mm) rib lath or over back wire of welded wire fabric or other approved lath, omitting the 10d nails.ASTM C1063 states, "Control joints shall be formed by using a single prefabricated member or fabricated by installing casing beads back to back with a flexible barrier membrane behind the casing beads. ![]() 9 W & M gage, ring shank, hook staple placed around a 10d common nail laid flat under the surface of the lath not more than 3 inches (76 mm) from edge of each sheet. Secure lath to each support with 1/ 2-inch-wide (12.7 mm), 1 1/ 2-inch-long (38mm) No.Wire ties shall be installed not less than 3 inches (76 mm) back from the edge of each sheet and shall be looped around stripping, or attached to an 8d common wire nail driven into each side of the joist 2 inches (51 mm) above the bottom of the joist or to each end of a 16d common wire nail driven horizontally through the joist 2 inches (51 mm) above the bottom of the joist and the ends of the wire secured together with three twists of the wire. 18 W & M gage galvanized annealed wire at one edge of each sheet of lath. Secure lath to alternate supports with ties consisting of a double strand of No.Where interior or exterior lath is attached to horizontal wood supports, either of the following attachments shall be used in addition to the methods of attachment described in referenced standards listed in Table 2507.2.
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