![]() ![]() The downward force of gravity and the multi-directional force of expansion and contraction are amplified when the veneer cladding is cantilevered over rigid continuous insulation. Traditional roofing nails and staples are not suitable fasteners for lath attachment over continuous rigid insulation. The insignificantly small added cost of galvanized lath and plaster washers and screws will ensure that this multi-million dollar home will perform beautifully for generations Though a common roofing nail may have initially held up the lath and the adhered masonry, it most certainly would have pre-maturely and catastrophically failed over time due to the heavy weight of the cladding and by the expansion and contraction caused by the extreme desert temperature swings. Paper-backed woven wire mesh was used for the stucco veneer clad sections of the home while a combination of paper-backed woven wire mesh and expanded metal lath were used for the heavier cultured stone veneer clad sections. The lath was then attached using 1¼-inch diameter Grip-plate galvanized steel lath and plaster washers with 4-inch long #10 Grip-Deck ci galvanized screws every 6 inches vertically on each 16-inch centered stud. The dual prongs enabled pre-spotting of the washers onto the surface of the insulation for easy on-the-wall fastener assembly. Beneath the heavy stucco and cultured stone veneer cladding is a 2-inch thick layer of continuous rigid extruded polystyrene insulation.įor this project, the 2-inch XPS insulation was attached with 1¾-inch diameter Plasti-Grip CI prong washers. Be sure to use a fastener long enough to penetrate the substrate to the recommended depth.Ī great example of properly attached adhered masonry over continuous insulation was recently completed on The New American Home project in Las Vegas for the International Builders Show. Auto-feed screw guns are also available with custom lath washer nose adaptors which can rapidly attach lath over rigid insulation up to 2-inch thickness, even into heavy gauge steel studs. When you fasten lath over thicker insulation (1-plus-inch) screws provide a much more consistent result compared to shot-in pins that will often ricochet or spall out. For thin insulation (up to 1-inch thickness) shot-in fasteners with 1¼-inch diameter lath and plaster washers may provide consistent results. Steel studs and concrete can be a bit more challenging depending on the thickness of the continuous insulation. Pneumatically shot-in galvanized fasteners or screws with 1¼-inch diameter lath and plaster washers are a great choice for wood substrates. Tools with magnetic nose adaptors to hold the lath and plaster washers have been developed for rapid attachment into steel, wood, or concrete substrates. ![]() Lath and plaster contractors are of course concerned with labor costs and how much time it will take to use slower fasteners and washers. The most important update is the fastener design. This spacing is not much different than what was traditionally used with staples or nails. Typical lath fastening patterns over CI is between 4 to 7 inches vertically on each 16-inch spaced framing member, dependent on weight and thickness of the assembly. Additional reports have been compiled by the WWCCA that detail suitable plaster assemblies over continuous insulation.
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