bag of Scratch and Brown Stucco Mix will cover approximately 70 sq. This assembly utilizes Teifs One Coat Stucco Base Concentrate or Teifs One Coat Stucco Base Sanded. When job is done, for spray for 24 hrs if possible. The calculator will indicate the number of 80 lb bags of QUIKRETE Base Coat Stucco and Finish Coat Stucco you will need to construct your stucco wall using a traditional 3 coat or 2 coat application process. 80 lb. Install the rigid foam over plywood sheathing (not OSB) that has been properly nailed to the studs, with 1/8-inch gaps between the panel edges so the sheets can expand without compressing each other. How thick should a scratch coat be? When poured on a perfectly level surface, one cubic yard will cover 27 square feet at one foot thick. Mix and apply the brown coat. . cement stucco Depending on the condition of the concrete surface, Portland cement stucco may be directly bonded to the concrete. The thicker the scratch coat, the better the overall strength characteristics of the finished plaster panel. Mortar was applied way to thin. The total . Start out with a latex concrete primer and either spray it on or brush it. How many layers does stucco have? Trowel Application of Florida MarbleCote Our recommended specifications for the application of Florida Marblecote are as follows: Apply in a scratch coat, a base coat and a finish coat. thick; together they are called the base coat. Available in: 50 lb. Stucco thickness depends on the backup system and on whether or not lath is present. This will help prevent the sheathing from developing joint lines that could telegraph through the foam and crack the stucco. New stucco (within the first year of application) should be primed and painted with the paint manufacturers' coatings designed for high pH surfaces. After the cement is on the wall, the scratcher is used to create horizontal lines in the stucco. It is highly water resistant and very structurally sound, consisting of about an inch thick layer of cement on the exterior of the home. bag of Takcoat Platinum (TPC) about 55 square feet @ 3/16" thick or 165 square feet @ 1/16" thick . Most of the bond between the scratch and brown is mechanical. Create horizontal grooves that are 1/8 (3mm) in thickness on your wall using a slotted palette, while keeping it perpendicular to the wall. This acts as an ideal base for the finish coat, which is integrally colored (in most cases) and is what you see on stucco, so the base needs to be uniform. ft. at 1/4" inch in thickness. According to ASTM C-926, this means that enough material should be applied on the lath "to embed the metal base, and with sufficient thickness of material over the metal to allow for scoring the surface." . (Actually the coat before the finish coat is the brown coat.) Proper thickness can be ensured by spot checks with a thin measuring . per sq. These are direct-applied systems, meaning that there is no metal lath involved. Two-Coat Stuccoing In a two-coat application, the brown coat is eliminated and the finish coat is applied directly to the scratch coat. What To Watch Out For When Applying Stucco Hi Victor, typical the scratch coat is 3/8 inch think and the brown is another 3/8 thick the final color coat is usually 1/8 thick which totals 7/8 thick, for a traditional 3 cost stucco system. The final thickness of a three-coat system is a minimum of 7/8-inch thick +/- allowable tolerances. per sq. These measurements are based upon approved industry standards for certified stucco installation. Apply another inch (9.5 mm) layer of stucco and screed to an even thickness, for a total thickness so far of inch (19 mm). What is 2 coat stucco? It is important to follow the manufacturers' instructions for 1) the type of coating to apply, 2) the timing between coats, and 3) the finished mil thicknesses when the coatings are dry. . 3 coats or layers with a total thickness of 3/4 of an inch or more (i.e., scratch coat, brown coat, and finish coat) Vulnerable to excessive cracking; Details are well developed. The normal thickness is between 3 and 5 mm. #6 Basecoat Thickness. Teifs One Coat has a min. Brown-coat plasters are applied, rodded, and floated to even the surface, provide a uniform suction throughout the base-coat plaster, and provide a desirable surface for the finish coat. Cure the scratch coat for 24 to 48 hours, keeping the surface damp by applying a fine water mist over several days. This acts as the base coat. Take time to spray it 3 to 4 times a day for 3 or 4 days. The approximately 7/8-inch three coat system is applied over an approved weather-resistive barrier and metal lath either by hand using a trowel or by machine application. Hedberg Supply does not stock all of the materials needed for Stucco Scratch Coat applications. Traditionally, it's at least 7/8 inch thick. b. gypsum, portland cement, and sand. Helpful? bags - 42 per pallet. Step 2: Apply the Brown Coat. Traditional" "Three-coat" stucco system (most common). This provides a key for your next coat or the brown coat to be applied to. Can I use mortar mix for stucco? Mix packaged stucco mix (such as Conproco or Quikrete) as directed. d. lime, glass fibers, and sand., 2. Basically the three coat system consists of paper and wire, a scratch coat, a brown coat and a finish, or "top . Step 6: Cure time. Quikrete 80 lb. . Stucco Installation Over Wood: Conventional stucco over wood should always be applied as a three-coat system. Or just fill out our stucco quote request form on this page. Traditional Hard Coat stucco is the most common type of stucco cladding used in the United States, it is applied in 3 layers over metal lath: Scratch coat 3/8 inch Brown coat 3/8 inch Finish coat 1/8 inch Big tip for all while on our channel. (22 mm), and weighs 10-12 lb. The building code has a minimum requirement for the thickness of Traditional Hard Coat stucco, it is 7/8 of an inch. The standard thickness for stucco is 3/4", NOT 3/8". The thicker the scratch coat, the better the overall strength characteristics of the finished plaster panel. Screed the material flat to a uniform 3/8-inch thickness with a straight-border darby or a straightedge. SPEC MIX Scratch and Brown Preblended Stucco is a dry, preblended cement-based product designed to be used as the scratch and/or brown coat in a three-coat stucco application. A Water-Resistant Barrier. Stucco thickness. The maximum thickness, including the finish coat, is 1/2-inch (12.7 mm). Can stucco be 3 thick? Step 2: Inspection of Lath. Characteristics: The brown coat surface is much smoother than the scratch coat and is gritty to the touch but flatter and looks more appealing than the scratch. In California, they say 7/8" min. The scratch coat should be scored in a horizontal direction; shallow scratching is adequate. Call our office at (904) 606-5353 to schedule your appointment. Step 7: Poly Prep (For Smooth Stucco Applications Only) Step 8: Painting Non Stucco Surfaces (Where Applicable) Step 9: Color Coat. www.orlandosentinel.com. ALWAYS wet the base before applying a new coat of stucco. I usually use 2-1/2 - 3 bags to a square, a square is 100 sq ft. We would normally use 55-70 bags for a job this size, not 32. August 2, 2017. thickness o' 1/2 mm), or two coats a maximum total thickness nth (22 Refer to code compliance report Concrete and Masonry. Stucco in one coats a marimum thickness of nn:h (16 mml. Both three-coat and two-coat ASTM C 926 stucco applications are recognized in the building code and have a long track . How thick is scratch and brown coat? 11. 25-lb Base Coat Stucco Mix Model # 3753 Find My Store for pricing and availability 25 QUIKRETE 80-lb Premixed Finish Coat Stucco Mix Model # 120280 Find My Store for pricing and availability LaHabra Fiber 47 Sanded 80-lb Base Coat Stucco Mix Model # 2500 Find My Store for pricing and availability El Rey The thickness can be one-eighth- to one-half-inch, depending on your local building codes. SPEC MIX Scratch and Brown has a custom blended sand gradation that increases the walls flexural strength while reducing cracking and crazing. The scratch coat must be applied to an entire wall or ceiling panel without interruption to avoid cold joints and abrupt changes in the uniform appearance of succeeding coats. It is very common to find the in many of today's modern homes. Scratch coat =3/8 inch thick, brown coat =3/8 inch thick, and finish coat =1/8 inch thick. After you have your first coat of stucco on, you then scratch it horizontally with a scarifier. The normal thickness is between 3 and 5 mm. ft. at 1/8" inch or 35 sq. Study with Quizlet and memorize flashcards containing terms like 1. Multiple coats may be required to match the thickness of the original stucco. Apply a second back-buttered layer, again covering the entirety of the stone to a to " thickness, and press onto the prepared scratch coat. The brown coat is applied in sufficient thickness to bring the . If wire is still showing after the scratch coat it's no big deal as you still have another coat and then it's important to cover the wire. Step 3: Scratch coat. The cement is spread evenly among the surface at a depth of about 3/8 of an inch thick. 1139) is a portland cement based stucco used for construction and repair of stucco walls. When installed to meet the building code, these systems are a minimum of 7/8 inch thick "One" or "Two-Coat", proprietary systems are also available (must be approved to meet code). The scratch coat should be applied at a uniform thickness of 3/8 inch to inch and be embedded well in the metal lath. Stucco Mix is a fast-setting polymer modified, fiber reinforced, portland cement-based stucco designed for use as the scratch and/or brown coat in a 3-coat stucco application, or the first coat in a 2-coat application. Baker tells home builders, "It's important to the strength of the stucco to fur the metal lath out from the wall, allowing it to be embedded in the scratch coat." Step 3: Finish With the Color Coat. This method speeds up the three coat stucco process by combining the scratch and brown coat into a single application of 3/8 to 1/2thick. The three-coat stucco system total thickness is approximately in. A one-coat stucco system--which is becoming more common--is not always one coat but is usually a modified one coat. Before drying, it is scored or grooved to create a strong . The scratch coat must extend to the top of the wall. 1 . The Brown Coat This coat is applied after the scratch coat, using the same techniques. According to ASTM C-926, this means that enough material should be applied on the lath, "to embed the metal base, and with sufficient thickness of material over the metal to allow for scoring the surface . Coverage is approximately 92-105 square feet at 3/8 inch thickness when mixed with 200-240 pounds of sand . worldtrippers.com Mix and apply another -inch layer of base coat stucco directly to the scratch coat. 3/8 inch total thickness - or thicker if required by a fire resistance rated or STC rated assembly and a maximum in accordance with ASTM C926. In addition to water, a stucco base coat mix consists of a. gypsum, lime, and sand. SPEC MIX Scratch and Brown Preblended Stucco is a dry, preblended cement-based stucco basecoat to be used as the scratch and/or brown coat in a three-coat stucco application. . Over a basic frame construction . Applying the Stucco First or Scratch Coat The first, or "scratch," coat, which forms the base for the next two coats, should completely encase the reinforcement. No matter what foundation you'll be working with, it's important to note that stucco thickness is not an arbitrary decision based on the company doing the installation. Beginning from the first to the . The resulting thickness is 1/2 instead of 3/4 as everywhere else. It is typically applied over rigid foam board and lath to provide an Energy Code required Continuous Insulated durable cladding. This method speeds up the three coat stucco process by combining the scratch and brown coat into a single application of 3/8 to 1/2 thick. Most commonly, stucco is applied on a basic wooden or metal framework, on concrete, or on plaster. Thickness around penetrations, such as doors and windows is a nominal 3/8-inch (9.5 mm), backed by framing and blocking. QUIKRETE Scratch and Brown Base Coat Stucco (No. Base Coat Stucco can also be applied directly to masonry walls for a two coat application. ** If using synthetic stucco, use fine sand. The finish coat will make the patch level with original stucco and match its texture. Two-coat Stucco (ASTM C 926): Typically over a solid plaster base of unit masonry or pre-cast or cast in place concrete with a 3/8-inch scratch, 1/8-inch brown and 1/8-inch finish coat for a total thickness of 5/8-inch (applied directly to the solid plaster base without lath). Over a basic frame construction . Step 4: Cure time. For two coat agglications scratch the first coat horizontally and the second coat as as the first is firm enough to it. Sometimes that is the first coat in some systems. Exterior stucco scratch coat thickness. | Photo: courtesy IBACOS . The stucco installer suggests using a slightly thinner coat both for the scratch and brown coat, then finish it as the other walls. Exterior stucco coat thickness or depth, then scarifier or put lines in the stucco. The three-coat stucco system total thickness is approximately in. the rougher and coarser the scratch the better the bond with the brown. If the scratch coat is too thin, the mortar joints between your concrete blocks can show through. This, too, is a bit of a misnomer. If you are looking for stucco installation contractors in Jacksonville FL are contact Stucco Repair Pros for a free stucco installation quote. Complies with ASTM C 926 requirements for cement based plaster. Most commonly, stucco is applied on a basic wooden or metal framework, on concrete, or on plaster. The Brown Coat - Ingredients: A very simple recipe for a stucco scratch coat consists of 3 parts sand to 1 part cement. Stucco is applied in three coats: scratch, brown, and finish. It is applied using a hawk and trowel and scratcher, spread evenly to achieve a depth of 3/8 of an inch thick. Can stucco be 3 thick? First coat is the scratch coat, so called because it is scratched horizontally to accept the 2nd, or brown coat, with minimum waste. . I have never heard of 2-coat stucco around here, although there is a one-coat stucco-like elastomeric product that is . This will prevent cracking. As shown in the illustration, the scratch coat of QUIKRETE Base Coat Stucco is applied to a 3/8" thickness, grooved, and cured as in a three-coat system. Allow each coat to dry 24-48 hours. In threecoat stucco, the first and second coats are 3/8-inch thick, and the finish coat is 1/8-inch for a total thickness of 7/8 to 1 inch. This involves the following parts: A Cement Coat. They are used on virtually every house and are the main components that form the edges of stucco walls. Nominal thickness is to 5/8 inch for no lath and to one inch with lath. This product also can be used as the first coat in a two-coat application for exterior stucco applications. The final wall system will produce a nonload-bearing . Impact and fire . one bag covers 50 square feet at 1/4" thickness. On wood-stud and cold-formed steel-stud wall assemblies, stucco is typically applied in three coats. Mix another batch using 1 part cement and 3 to 5 parts sand. For cast-in-place or precast concrete, the thickness for two-coat work is 3/8 inch. As its name suggests, three coat stucco is applied in three layers: 3/8-inch thick scratch coat, 3/8-inch thick brown coat, and approximate 1/8-inch thick finish coat. Wait for it to stiffen, and then scratch the surface with a raking tool to form 1/8-inch deep horizontal . If you get traditional stucco that is going to be extra heavy, then chances are you're going to need a 3-Coat stucco. . Use a combination of both methods. It is applied with a hawk and trowel and a scratcher. What is the brown coat in stucco? (I just finished a house, 3200 square feet, that used 80 bags for the scratch and brown.) * One shovel full of sand weighs approximately 10 to 12 pounds. Saving is roughly 20% for that wall. Stucco about 6 square feet @ 3/4" thick; Stucco about 21 square feet of finish coat @ 3/16" thick; Bond coat with 50 lb. The scratch coat is applied to a thickness of half an inch and should completely surround the lath. As a stucco assembly, Teifs One Coat provides a durable exterior. Each coat should be 1 / 4 " to 3 / 8 ", no more. Advantages of Stucco. . What is the correct thickness of stucco? What is a 2 coat stucco system? When both are applied, that's your basecoat; the surfaces are unlimited if you want to put a texture in the base coat. The scratch coat must be scored horizontally on vertical surfaces. In this video, I answer the old question, how thick stucco. [20] Once the brown coat loses its sheen, float it smooth. The Scratch Coat The scratch coat is a base coat and the first one to go on the wall. How thick is stucco coat? Masonry and concrete shall be sound, free of coatings, cured minimum 28 days. Using a straight board or darby, screed the surface to a thickness of inch and fill any surface voids with additional base coat. This helps the brown coat stick to it. This mix is the perfect base coat choice for a traditional three coat stucco application. The scratch coat is formed using one part Type I Portland cement, 1/4 part hydrated lime, and two to four parts sand, with enough water added to give the consistency of a slurry. bags - 56 per pallet. The second coat of a stucco or plaster job is called the brown coat. The scratches will make the next layer stick better. Step 1: Spread the Scratch Coat. The correct thickness is then 5/8 inch. Base-Coat Thickness. The goal is to achieve a uniform layer of mortar on the wall that supplements the mortar of the scratch coat and achieves a minimum 50 psi shear bond strength. Use for scratch-coat stucco and brown-coat stucco applications Can be used to repair stucco walls 90-minute working time 1,200 psi In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. www.echotape.com. c. portland cement, lime, and sand. Types of Stucco. Limitations not install Stopowe-e.all Do not let the top coat dry quickly. Painting Stucco: If you are thinking of painting your stucco wait 4 - 5 weeks so that all of the moisture is out. Meets ASTM C 926 for Portland cement based plaster. Apply a thin coating, approximately 1/4 " (6.4mm) or 1/2 (12mm) with the trowel, then wait till it dries. . Scratch Coat Product: Mix ratio: Thickness: Bags: CO 2 saved: Cost: Coat 2 - Brown Coat Product: How thick is stucco over concrete block? by Sakrete Customer Care | Mar 5, 2022. For 3/8 inch Scratch Coat Plus 3/8 inch Brown Coat: . The base coat must be moistcured for two days, then further curing of five days before application of the finish coat. 12. How thick is a stucco scratch coat? Step 10: Clean-Up & Walk-Through. The scratch and brown coats are Portland cement plaster, typically each approximately 3/8in. For most three-coat systems the scratch and brown coats are of a Portland Cement Plaster, often with no modifiers or additives. For unit masonry, that thickness is inch. (22 mm), and weighs 10-12 lb. If a greater thickness is required, apply 1/4 inch each time. Number of 80# Bags: Finish Coat Stucco at 1/4 inch Thickness: Number of 80 . Two-coat applications are only for use over solid plaster bases without metal lath. These systems may be as thin as 3/8 inch. 3 Coat Stucco. Have a great . , An 80lb. The Northwest Walls and Ceiling Bureau Stucco Resource Guide (available here) is a great resource for more information. In a typical three-part stucco application, you apply a scratch coat to lath or netting, followed by a brown coat and a color coat. Lime and other things can also be added but aren't usually needed. The base coat is applied in a single application (combining the scratch and brown coat) to a minimum thickness of 3/8-inch (9.5 mm), unless otherwise noted. How thick should a scratch coat be? Final coat is the color coat, about 3/16" thick, for a total stucco thickness of about 7/8". Step 5: Brown coat. Water-resistant base used as a scratch and brown coat in non-structural stucco wall construction. The thickness ranges from 3/8 to 5/8. Application Methods: The plaster may be applied by hand tools or machine pumps but must be applied with sufficient pressure to adhere to the substrate. The three coats should be approximately 5/8" thick. 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