Stucco is applied in three coats: scratch, brown, and finish. 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. The Northwest Walls and Ceiling Bureau Stucco Resource Guide (available here) is a great resource for more information. How thick should a scratch coat be? Quikrete 80 lb. The second coat of a stucco or plaster job is called the brown coat. Step 5: Brown coat. Coverage is approximately 92-105 square feet at 3/8 inch thickness when mixed with 200-240 pounds of sand . Apply a thin coating, approximately 1/4 " (6.4mm) or 1/2 (12mm) with the trowel, then wait till it dries. The Brown Coat This coat is applied after the scratch coat, using the same techniques. How thick is stucco over concrete block? This will help prevent the sheathing from developing joint lines that could telegraph through the foam and crack the stucco. Two-coat applications are only for use over solid plaster bases without metal lath. For two coat agglications scratch the first coat horizontally and the second coat as as the first is firm enough to it. Hedberg Supply does not stock all of the materials needed for Stucco Scratch Coat applications. 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. 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. Scratch Coat Product: Mix ratio: Thickness: Bags: CO 2 saved: Cost: Coat 2 - Brown Coat Product: 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. The final thickness of a three-coat system is a minimum of 7/8-inch thick +/- allowable tolerances. Stucco thickness. A one-coat stucco system--which is becoming more common--is not always one coat but is usually a modified one coat. How thick is scratch and brown coat? 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 stucco installer suggests using a slightly thinner coat both for the scratch and brown coat, then finish it as the other walls. The normal thickness is between 3 and 5 mm. For cast-in-place or precast concrete, the thickness for two-coat work is 3/8 inch. Most commonly, stucco is applied on a basic wooden or metal framework, on concrete, or on plaster. Can stucco be 3 thick? Screed the material flat to a uniform 3/8-inch thickness with a straight-border darby or a straightedge. Over a basic frame construction . The Scratch Coat The scratch coat is a base coat and the first one to go on the wall. 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 . The thickness can be one-eighth- to one-half-inch, depending on your local building codes. thick; together they are called the base coat. (Actually the coat before the finish coat is the brown coat.) If you are looking for stucco installation contractors in Jacksonville FL are contact Stucco Repair Pros for a free stucco installation quote. Sometimes that is the first coat in some systems. . For unit masonry, that thickness is inch. The three-coat stucco system total thickness is approximately in. Lime and other things can also be added but aren't usually needed. 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. If you get traditional stucco that is going to be extra heavy, then chances are you're going to need a 3-Coat stucco. Available in: 50 lb. 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. 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. These systems may be as thin as 3/8 inch. 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. 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. The scratches will make the next layer stick better. 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. . This assembly utilizes Teifs One Coat Stucco Base Concentrate or Teifs One Coat Stucco Base Sanded. How thick is a stucco scratch coat? 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. Stucco Installation Over Wood: Conventional stucco over wood should always be applied as a three-coat system. 12. Thickness around penetrations, such as doors and windows is a nominal 3/8-inch (9.5 mm), backed by framing and blocking. The thicker the scratch coat, the better the overall strength characteristics of the finished plaster panel. 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. Use a combination of both methods. Step 4: Cure time. What is a 2 coat stucco system? It is applied using a hawk and trowel and scratcher, spread evenly to achieve a depth of 3/8 of an inch thick. bags - 56 per pallet. Types of Stucco. Step 2: Apply the Brown Coat. Step 2: Inspection of Lath. E. Do not apply stucco material when temperatures are 40 Degrees Fahrenheit or below. The building code has a minimum requirement for the thickness of Traditional Hard Coat stucco, it is 7/8 of an inch. thickness o' 1/2 mm), or two coats a maximum total thickness nth (22 Refer to code compliance report Concrete and Masonry. 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). c. portland cement, lime, and sand. Traditional" "Three-coat" stucco system (most common). What To Watch Out For When Applying Stucco Water-resistant base used as a scratch and brown coat in non-structural stucco wall construction. This product also can be used as the first coat in a two-coat application for exterior stucco applications. Stucco thickness depends on the backup system and on whether or not lath is present. * One shovel full of sand weighs approximately 10 to 12 pounds. . When both are applied, that's your basecoat; the surfaces are unlimited if you want to put a texture in the base coat. 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. . 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 After you have your first coat of stucco on, you then scratch it horizontally with a scarifier. | Photo: courtesy IBACOS . Impact and fire . It is typically applied over rigid foam board and lath to provide an Energy Code required Continuous Insulated durable cladding. Complies with ASTM C 926 requirements for cement based plaster. In California, they say 7/8" min. For 3/8 inch Scratch Coat Plus 3/8 inch Brown Coat: . . Exterior stucco coat thickness or depth, then scarifier or put lines in the stucco. SPEC MIX Scratch and Brown has a custom blended sand gradation that increases the walls flexural strength while reducing cracking and crazing. . Before drying, it is scored or grooved to create a strong . This provides a key for your next coat or the brown coat to be applied to. Over a basic frame construction . Proper thickness can be ensured by spot checks with a thin measuring . 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). worldtrippers.com Two-Coat Stuccoing In a two-coat application, the brown coat is eliminated and the finish coat is applied directly to the scratch coat. bags - 42 per pallet. one bag covers 50 square feet at 1/4" thickness. Most commonly, stucco is applied on a basic wooden or metal framework, on concrete, or on plaster. ALWAYS wet the base before applying a new coat of stucco. Base-Coat 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." The thickness ranges from 3/8 to 5/8. 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. ** If using synthetic stucco, use fine sand. The scratch and brown coats are Portland cement plaster, typically each approximately 3/8in. How thick is stucco coat? Do not let the top coat dry quickly. 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. The correct thickness is then 5/8 inch. The brown coat is applied in sufficient thickness to bring the . Traditionally, it's at least 7/8 inch thick. For most three-coat systems the scratch and brown coats are of a Portland Cement Plaster, often with no modifiers or additives. This acts as the base coat. They are used on virtually every house and are the main components that form the edges of stucco walls. 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. Final coat is the color coat, about 3/16" thick, for a total stucco thickness of about 7/8". Allow each coat to dry 24-48 hours. These measurements are based upon approved industry standards for certified stucco installation. bag of Scratch and Brown Stucco Mix will cover approximately 70 sq. Each coat should be 1 / 4 " to 3 / 8 ", no more. This, too, is a bit of a misnomer. The scratch coat must be scored horizontally on vertical surfaces. The cement is spread evenly among the surface at a depth of about 3/8 of an inch thick. Multiple coats may be required to match the thickness of the original stucco. August 2, 2017. The three coats should be approximately 5/8" thick. Using a straight board or darby, screed the surface to a thickness of inch and fill any surface voids with additional base coat. Stucco in one coats a marimum thickness of nn:h (16 mml. Beginning from the first to the . The finish coat will make the patch level with original stucco and match its texture. What is the brown coat in stucco? (I just finished a house, 3200 square feet, that used 80 bags for the scratch and brown.) #6 Basecoat Thickness. This will prevent cracking. 1 . Exterior stucco scratch coat thickness. (22 mm), and weighs 10-12 lb. ft. at 1/8" inch or 35 sq. Base Coat Stucco can also be applied directly to masonry walls for a two coat application. 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 product designed to be used as the scratch and/or brown coat in a three-coat stucco application. The base coat must be moistcured for two days, then further curing of five days before application of the finish coat. What is the correct thickness of stucco? Mortar was applied way to thin. I have never heard of 2-coat stucco around here, although there is a one-coat stucco-like elastomeric product that is . d. lime, glass fibers, and sand., 2. Create horizontal grooves that are 1/8 (3mm) in thickness on your wall using a slotted palette, while keeping it perpendicular to the wall. www.orlandosentinel.com. Wait for it to stiffen, and then scratch the surface with a raking tool to form 1/8-inch deep horizontal . www.echotape.com. In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. When poured on a perfectly level surface, one cubic yard will cover 27 square feet at one foot thick. Step 1: Spread the Scratch Coat. What is 2 coat stucco? After the cement is on the wall, the scratcher is used to create horizontal lines in the stucco. Step 3: Scratch coat. Teifs One Coat has a min. The term one coat stucco refers to a blend of Portland cement, sand, fibers, special proprietary chemicals, and water. The scratch coat must extend to the top of the wall. In this video, I answer the old question, how thick stucco. First coat is the scratch coat, so called because it is scratched horizontally to accept the 2nd, or brown coat, with minimum waste. Cure the scratch coat for 24 to 48 hours, keeping the surface damp by applying a fine water mist over several days. The scratch coat should be applied at a uniform thickness of 3/8 inch to inch and be embedded well in the metal lath. 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. These are direct-applied systems, meaning that there is no metal lath involved. It is highly water resistant and very structurally sound, consisting of about an inch thick layer of cement on the exterior of the home. The scratch coat should be scored in a horizontal direction; shallow scratching is adequate. Number of 80# Bags: Finish Coat Stucco at 1/4 inch Thickness: Number of 80 . Use for scratch-coat stucco and brown-coat stucco applications Can be used to repair stucco walls 90-minute working time 1,200 psi Painting Stucco: If you are thinking of painting your stucco wait 4 - 5 weeks so that all of the moisture is out. The three-coat stucco system total thickness is approximately in. QUIKRETE Scratch and Brown Base Coat Stucco (No. The final wall system will produce a nonload-bearing . If the scratch coat is too thin, the mortar joints between your concrete blocks can show through. 80 lb. . Saving is roughly 20% for that wall. New stucco (within the first year of application) should be primed and painted with the paint manufacturers' coatings designed for high pH surfaces. the rougher and coarser the scratch the better the bond with the brown. As a stucco assembly, Teifs One Coat provides a durable exterior. It is applied with a hawk and trowel and a scratcher. Both three-coat and two-coat ASTM C 926 stucco applications are recognized in the building code and have a long track . Basically the three coat system consists of paper and wire, a scratch coat, a brown coat and a finish, or "top . ft. at 1/4" inch in thickness. Step 6: Cure time. The total . 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. Can I use mortar mix for stucco? Step 3: Finish With the Color Coat. Have a great . 3 Coat Stucco. Meets ASTM C 926 for Portland cement based plaster. A Water-Resistant Barrier. The maximum thickness, including the finish coat, is 1/2-inch (12.7 mm). 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. Helpful? per sq. Take time to spray it 3 to 4 times a day for 3 or 4 days. per sq. 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." Masonry and concrete shall be sound, free of coatings, cured minimum 28 days. 11. Mix and apply another -inch layer of base coat stucco directly to the scratch coat. Study with Quizlet and memorize flashcards containing terms like 1. 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. 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. (22 mm), and weighs 10-12 lb. This helps the brown coat stick to it. Mix packaged stucco mix (such as Conproco or Quikrete) as directed. Mix another batch using 1 part cement and 3 to 5 parts sand. Stucco about 6 square feet @ 3/4" thick; Stucco about 21 square feet of finish coat @ 3/16" thick; Bond coat with 50 lb. 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 How thick should a scratch coat be? How many layers does stucco have? 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. Mix and apply the brown coat. The normal thickness is between 3 and 5 mm. Nominal thickness is to 5/8 inch for no lath and to one inch with lath. Limitations not install Stopowe-e.all This mix is the perfect base coat choice for a traditional three coat stucco application. Call our office at (904) 606-5353 to schedule your appointment. Advantages of Stucco. bag of Takcoat Platinum (TPC) about 55 square feet @ 3/16" thick or 165 square feet @ 1/16" thick . 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. It is very common to find the in many of today's modern homes. The standard thickness for stucco is 3/4", NOT 3/8". If a greater thickness is required, apply 1/4 inch each time. 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). 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. . This involves the following parts: A Cement Coat. [20] Once the brown coat loses its sheen, float it smooth. The thicker the scratch coat, the better the overall strength characteristics of the finished plaster panel. Or just fill out our stucco quote request form on this page. , An 80lb. b. gypsum, portland cement, and sand. 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 resulting thickness is 1/2 instead of 3/4 as everywhere else. 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. Scratch coat =3/8 inch thick, brown coat =3/8 inch thick, and finish coat =1/8 inch thick. Step 10: Clean-Up & Walk-Through. 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. Can stucco be 3 thick? Most of the bond between the scratch and brown is mechanical. Step 7: Poly Prep (For Smooth Stucco Applications Only) Step 8: Painting Non Stucco Surfaces (Where Applicable) Step 9: Color Coat. The scratch coat is applied to a thickness of half an inch and should completely surround the lath. On wood-stud and cold-formed steel-stud wall assemblies, stucco is typically applied in three coats. When job is done, for spray for 24 hrs if possible. . 1139) is a portland cement based stucco used for construction and repair of stucco walls. The Brown Coat - Ingredients: A very simple recipe for a stucco scratch coat consists of 3 parts sand to 1 part cement. by Sakrete Customer Care | Mar 5, 2022. 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