Starting from the bottom of the wall, the inner layer of WRB should be installed, along with flashings, to create a drainage plane. The standard also requires that the two separate layers be installed in shingle fashion. 3) requires two separate layers of water-resistive barrier (WRB) to be installed over wood sheathing in exterior applications. Do not bond manufactured stone masonry veneer to clay masonry surfaces.ĪSTM C1780, Standard Practice for Installation Methods for Adhered Manufactured Stone Masonry Veneer, (ref. If a bondable surface cannot be achieved, attach lath and a scratch coat before installing manufactured stone veneer. Typically, cleaning may be done with power washing and/or mechanical methods (i.e. An ICRI CSP equal to or greater than 2 is usually acceptable. 5) discusses Concrete Surface Profile (CSP), a standardized method to measure concrete surface roughness. They must have a rough texture to ensure a mortar bond. Manufactured stone veneer can be directly applied to surfaces of concrete and concrete masonry if they are free of dirt, waterproofing, paint, form oil, or any other substance that could inhibit the mortar bond. 11) limits the deflection of wall systems to L/240 for brittle finishes. Also note that the International Building Code (ref. Additionally, the wood framing should be relatively dry at the time of installation, as drying of the wet substrate causes shrinkage which could lead to cracking of the finish. This will allow water entry and degradation of the substrate, the veneer and the framing. Without the gap, wood swelling will cause the adhered masonry veneer finish to crack, compromising the water resistance of the finish. (3 mm) gap between the sheets on all sides to accommodate wood sheathing expansion when it gets wet. 1), when wood structural panel sheathing (plywood or oriented strand board – OSB) is used as the substrate material, it must have a ⅛ in. Substrate PreparationĪccording to The Engineered Wood Association’s (APA) Installation of Stucco Exterior Over Wood Structural Panel Wall Sheathing (ref. 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.KEY INSTALLATION/ INSPECTION POINTS 1. 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.
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