stucco thickness over plywood

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