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stucco thickness over plywood

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

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