The minimum thickness over framed walls is 3/4-inch. Spread a 3/8-inch thick layer of base or scratch coat stucco over metal lath with a rectangular mason's trowel and roughen the surface with the notched edge of the trowel. We are often asked if stucco and plaster are the same thing, and if plaster and exterior insulation finishing systems (EIFS)are the same thing. Install casing bead as a plaster stop at the corners of doors … What is the correct thickness of stucco? Local codes do not dictate how the stucco is applied or how far it needs to be above the surface of the ground. Pros. Fastwall 100-HE is a "High Efficency" Continuous Insulation (CI) stucco assembly with a base thickness between 3/8 to 1/2 in. The layer of Grade B paper may be applied as aWhen plywood ex-separate sheet or attached to and a part of paperback stucco mesh. See stucco to fill the gaps in the mesh and apply to a thickness of about 3/8 of an inch thick. that stucco cladding be installed in three coats with a total thickness of 21 mm. Fasten the netting to the wall, using galvanized nails or … It is our opinion that major cause for cracked stucco is improper plywood installation during stucco installation process. As an insulated stucco assembly, LaHabra Fastwall 100-HE provides a durable exterior with an energy saving layer of continuous insulation. .. One-coat systems may be applied as thin as 3/8-inch. Then feel free to install vertical strapping and stucco. Stucco works different in different climates. The additional thickness of stucco on metal base is required to attain the desired hardened cementations properties. Fortunately, whether your house has vinyl, brick, or stucco siding, the process of installing plywood over the windows is relatively straightforward. For example, three sides of the house might be plywood, with the front being made of manufactured veneer stone or cedar shingles. Method 1 of 2: Simply screw the plywood over the entire window or use clips to install the plywood inside the window frame. Stucco thickness depends on the backup system and on whether or not lath is present. For example, one coat stucco is actually a two-step process. Rather than using drywall on the ceiling, stucco installations that go beyond the basic troweled-on layer need plywood backing to hold the metal lath in place. As with the brown coat, mix only enough stucco that can be applied in 1 hour and complete the entire wall or major section in one session to reduce possible color variations. 1. (stucco) as an exterior finish over plywood wall sheathing is recognized as a “generic” construction system under provisions in the Uniform Building Code (UBC). These days, it makes more sense to start with wall sheathing: rigid foam, diagonal boards, or plywood. A 3.2 mm (1/8 in) thick polyethylene spacer. All these systems apply a single base coat and a top coat with a total thickness of 2/8 to 1/2-inch, compared to 7/8 to 1 inch for traditional three-coat stucco. Depending on the contamination, you might only need to wash with water. Since it is twice as thick as one co… It is applied … thick. Successive coats should be applied as soon as possible after the The thickness of stucco on a solid substrate is 5/8 or 1/2 inch. As far as painting, it is not done on new stucco as the color is in the finish. Plywood siding is available in large sheets of 8 feet long or longer, so installation goes faster. Place stucco wheelbarrow for each application. Mix the stucco until it forms the consistency of thick mud. The thinner finish weighs from 5 to 6 pounds per square foot, compared to 9 pounds for three-coat, and it is cost-competitive with traditional stucco. The spaces between the strips of Kraft paper allow for the visual alignment of the sheet for mechanical attachment of the ribs to the substrate. Steps. Stucco provides a durable, low maintenance finish that adds lots of character to a house. Follow with the three-dimensional drainage mat and two more layers of paper or felt. Let dry for 24 hours. While there are several parts of the North America where stucco always has a strong presence, there appears to be a general renewed interest in portland cement plaster for building finishes everywhere. Apply two layers of grade D building paper or asphalt felt to the plywood siding. My only warning using this product is properly hiding the seams (where two or more edges of Hardie panel meet or join. Install weep screeds and casing bead. How do you stucco over plywood? Lets take a look at each technique as well as the advantage that each has to offer. However, on metal base the thickness is 5/8 to 7/8 inch. Check out our recommended tools right here: https://www.stuccoplastering.com/tools/ Hello, our faithful subscribers and plasterers around the world! This construction, which uses 2x wood studs spaced 16 inches o.c., eliminates the need for a CA has a high humidity level and much more rain. The big advantage to three coat is its strength and durability. Our Drainage Mat. The siding is 20 years old and we want to get rid of it. Spread the stucco over the wall with the help of smooth trowel. Conventional stucco over wood should always be applied as a three-coat system. Buy a prepared brown coat stucco mix and add water according to package directions. Stucco cracks develop for quite a few reasons, as we mentioned above. If water sprinkled on the wall is not readily absorbed, then the surface must be handled differently. It must be solid enough to hold in the lath, but fluid enough to spread easily. Trowel the 1/8" thick finish coat over the brown coat, starting at the bottom and working to the top of the wall. Although I do agree that six inches at least be done. You can use caulk or stucco patch, or epoxy on the joints. I have plywood siding with vertical battens attached to make it look like board & batten. The Scratch Coat… The scratch coat is a base coat and the first one to go on the wall. Zenith Spacer. A white, 3.2 mm (1/8 in) thick mat composed of open weave polymer threads. Professional stucco repair contractor can always recognize stucco cracking originated by plywood because of the different crack directions. Plywood is a dimensionally stable wood, so it resists major expansion, contraction, warping, and swelling. Manufactured stone veneer is a version of hardcoat stucco where the top coat is replaced with an embedded thin stone veneer ( Photograph 3 ). Kraft paper is factory applied to prevent over spray of stucco. Depending upon your particular climate, expansion and contraction of fiber cement product should be considered. Secure stucco mesh to your walls and then apply your layers of stucco for a watertight finish. For many decades in California, stucco was installed directly over the studs, without any sheathing whatsoever. Spray Lath is a West Coast product, where stucco is spray applied to the surface of the lath to build up the stucco thickness. Adequate protection of the plywood may be accomplished upon application of one layer of Grade B building paper applied over the plywood. The scratch coat must be scored horizontally on vertical surfaces. that includes a layer of continuous insulation up to 1-1/2 in. Attach the masonry ties securely through the panels and into the steel or wood framing. Asphalt felt, then metal lath, then stucco -- that was all. Most all fire-rated assemblies require 7/8-inch and some require a full 1-inch thick cement plaster. Step 3: Install Galvanized Lath or Netting. The Alberta Building Code (ABC), which is the legislated building code in Alberta, is based on the NBC but also permits two-coat stucco with a total thickness of not less th an 19 mm. Allow this base material to harden for one hour and scratch lightly with a … uniform thickness of stucco finish and reduces the risk of wavy wall surfaces. 2. 2. optional when installed over Tyvek® StuccoWrap™. 1. Always refer to the fire-rated assembly test before making an assumption. Make sure to have each joint supported a 2" x 4" wood, with or without plywood backer. Sometimes caulk or stucco patch can be used to hide the joints. Use a trowel to dance stucco. UBC provisions specify 7/8-inch exterior cement plaster over plywood wall sheathing, with 2x wood studs … Before applying stucco over wood, you will need to attach a layer of roofing felt to the surface followed by a sheet of wire mesh.Then apply a thin layer of stucco to the wire mesh surface as a base for the final coat. Space the ties as required by masonry courses. J. Plywood Siding K. Vinyl Siding L. Fiber Cement Siding M. Metal Siding Brick Cavity Wall Masonry or stone veneer can be applied over DensGlass Sheathing just as it would be over any other type of sheathing. Generally, stucco that is applied directly to solid surfaces is placed in two coats that together total 5/8 inch of thickness. Do The Job Right Proper installation is important if these desirable results are to be ... (stucco exterior finish) over plywood wall sheathing. Scratch coat =3/8 inch thick, brown coat =3/8 inch thick, and finish coat =1/8 inch thick. Finish Coat Stucco applied to a 1/8" thickness. Note the continuity of the thermal control layer via overlapping foam layers at the slab-to-wall interface. Hardcoat stucco is typically a three layer cementitious rendering (scratch coat, brown coat and top coat) applied over a building paper, metal lath and sheathing (Photograph 2). Figure 2 - Stucco is installed over rigid insulation, which is installed over a drainage plane consisting of a drainage gap and building wrap layer over the sheathing. It can be applied with either a one coat or three coat process, but there is some confusion about the methods. treated plywood residential EIFS system 1 (optional when Zenith™ is installed over Tyvek®. In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. Continuity of the plywood over the wall is not readily absorbed, then the of. Is available in large sheets of 8 feet long or longer, so installation goes.! 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