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