That doesn't sound unreasonable to me. This mix is the perfect base coat choice for a traditional three coat stucco application. They are used on virtually every house and are the main components that form the edges of stucco walls. 4) dome inside 44 inches inside diameter x 23 inch tall from inside, fire brick was secured with DIY mix of silica sand . 3-Coat Stucco According to the stucco manufacturers, the typical moist-curing time is a minimum of 48 hours. Moist air, fog, rain, winter weather can turn a 48 hour scratch coat cure or a 7 day brown coat cure into a 10 day cure. It starts with a "scratch coat" spread over metal lath attached to a house's exterior sheathing. And too, the main purpose of the scratch coat of stucco is to provide a rigid backing for the brown coat. It acts as a primer to prepare the wall surface ready for your final coating making it more smooth and bond better. Limitations 1. Painting Stucco: If you are thinking of painting your stucco wait 4 - 5 weeks so that all of the moisture is out. Apply first coat of stucco (scratch coat) 3/8 to 1/2 inch thick, matching the thickness of the original scratch coat. Base coat. The critical consideration is that the scratch coat must be hard. This is actually not a single coat, but rather, a cement base coat followed up by a topcoat. COATING: Color coat may be applied after the completion of water curing Stucco Mix per the color coat manufacturer. Moist cure the scratch Traditional stucco is applied in a three-coat process to wood-frame exterior walls. The Scratch Coat The scratch coat is a base coat and the first one to go on the wall. Moist-curing can be terminated after 48 to 72 hours, but the finish coat should remain uncoated for at least seven days to prevent coating failure or poor bonding. Application of Scratch Coat. Fast Setting. The Brown coat is similar to the scratch coat but with a little different mixture of materials and it will have a granular sandy type of gritty texture and be smoother and flatter then the scratch coat. Cure Time: The brown coat requires a lot more time to cure (28 days is recommended). Curing schedules, however, prove to be the Achilles' heel of modern-day stucco. Tools Used: The brown coat can be applied using the same methods as the scratch coat. Keep in mind when applying a cementitious finish this can be done after two weeks cure time of the base coat, however if you are painting or applying an acrylic finish (both seal the basecoat) 28 days is necessary for the second coat to cure before final application of the acrylic. After the scratch coat has been moist-cured for at least 48 hours, the brown coat is applied with firm pressure to create a strong mechanical and chemical bond between the coats. However, other types can also have 1-Coat options. The brown coat is the main structural component of three coat stucco applications. Approximate Coverage One 80 lb bag yields approximately 9 - 10 ft 2 (.84 - .92 m ) at 3/4" (19.1 mm) thick, 13 - 15 ft 2 (1.2 - 1.4 m ) at 1/2" (12.7 mm) thick. This allows the cement to . . Once this moisture has absorbed, continue to hydrate the wall for the next 48 to 72 hours until the surface stops absorbing water. Add the Brown Coat 7. Apply the base coat before the sun hits it and cover up to keep the sun and breeze of it. Initial bond strength supports application of the stucco brown coat within 1-3 days. Water resistant with a breathable finish. The final thickness of the plaster is 3/8 inch to 1/2 inch. After that a hard rubber float (neoprene) is used to "float" the brown coat, compacting it. It is applied with a hawk and trowel and a scratcher. Can be used in a 3-coat system or 2-coat scratch and brown application. Three coat is the original stucco process, consisting of paper and wire, a scratch coat, a brown coat, and a finish, or "top" coat. In industry terms lath, scratch and brown. As the temperature drops, curing slows. This base coat has modifiers such as fiberglass fibers that provide the strength required for the thinner, final product. Use for scratch-coat stucco and brown-coat stucco applications Can be used to repair stucco walls 90-minute working time 1,200 psi How long does stucco scratch coat need to dry? The term one coat stucco refers to a blend of Portland cement, sand, fibers, special proprietary chemicals, and water. This varies based on weather conditions and how thick the concrete is. (9.5mm) thickness per coat. Set Time (Minutes) 300. 1-year limited . The requirements to moist cure become less stringent during the winter so a specifier or contractor needs to be aware and not over wet the walls and create other issues. If there is a delay before applying the brown coat, moist-cure the scratch coat daily until the brown coat is applied. 1-Coat Stucco. Feet) 10. It usually takes 10 days or more for the layers of stucco to get cured. This stucco system consists of a scratch coat, brown coat and finish coat. With the basics of stucco mixing and coating down, here are the basic steps for repairing stucco. Start out with a latex concrete primer and either spray it on or brush it. It can take weeks for each layer to be applied and cure. thick; together they are called the base coat. The owner is going to have one side of the house that presently has the siding stuccoed. but a longer cure time is beneficial. Apply Adhesive 3. This cannot be held with a few nails. Let the stucco cure for 24 to 48 hours, misting as needed to keep it moist. A typical 80 pound bag of 4000 psi Quickrete Concrete Mix will be dry strong enough to support weight in around 24-48 hours. bags - 42 per pallet. Compression Strength (PSI) 1200. This will then be drawn through your scratch coat on drying out. After it's applied, scratch the coat horizontally. Take time to spray it 3 to 4 times a day for 3 or 4 days. Prepare the Wall 2. The two drawbacks are time and cost. Warranty. In either case, the brown coat must cure a minimum of 7 days prior to the application of the finish coat per the UBC and IBC. (finish coat). . Wait for the scratch coat to set up to 10 to 12 hours, depending on the air temperature and humidity, before hydrating the scratch coat. (22 mm), and weighs 10-12 lb. Cure Time: The scratch coat should be allowed to moist cure for a period of 3-5 days. There are two widely accepted and most effective methods for curing stucco. Structo-Lite Basecoat Plaster is applied by hand or machine methods, on gypsum or metal lath, clay tile, concrete or cinder blocks and other approved plaster bases to provide a lightweight, high-thermal-conductivity conventional plaster application. Soak your bricks with plenty of water. CA Residents: Prop 65 Warning(s) Prop 65 WARNING(S) UNSPSC. Mist the Surface 4. Follow stucco manufacturer's recommendations for frequency and duration of water hydration and cure between . For best results, let brown coat sit 4-8 weeks before finishing. The most traditional and popular of these types is 3-coat stucco, in which stucco is applied in three coats over metal reinforcement. The scratch coat must be scored horizontally on vertical surfaces. Stucco is a cement-based product and as such requires curing, the same as any Portland cement-based product. In general, it takes concrete a full 28 days to fully dry and cure. Stucco advantages? Scratch and Brown Base Coat Stucco may be applied with a trowel or sprayer according to typical stucco techniques. n Surface of the first or scratch coat shall be scored or horizontally or in one direction on ceilings to form a mechanical key for succeeding second or brown coat. Specifications for nailing the lath to different substrates are found in ASTM Specification C-1063 (Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster). . Here are the top 10 keys to achieving a great stucco job. 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. Portland cement-based plaster is such a material that uses portland cement as the binder. On lathed construction the total thickness of both coats together shall be 3/4-7/8 inch (19-22mm). The first coat that you apply to your concrete walls is called the scratch coat. The base coat must be moistcured for two days, then further curing of five days before application of the finish coat. Learning how and why to apply stucco scratch coats for beginners or DIYers.Feel free to check out our recommended tools on our Amazon website below.https://w. How To Stucco a Concrete Wall - Step by Step Guide 1. Step 4: Cure Time The cure time is a very important step because it ensures that the scratch coat dries and is ready for the next step. Apply a thin coating, approximately 1/4 " (6.4mm) or 1/2 (12mm) with the trowel, then wait till it dries. Let the brown coat stiffen for a short time, and then float the surface with a sponge masonry float to smooth it. Besides, weather condition also plays a vital role sometimes. Applied wet-on-wet, StuccoPrime and the stucco scratch coat cure together forming a strong chemical and mechanical bond. After waiting for this amount of time, apply a gentle stream of water to hydrate the scratch coat. Then let it dry-cure for 10 days (even though most. The base coat is applied to and encapsulates the lath. COATING: Color coat may be applied after the completion of water curing Stucco Mix per the color coat manufacturer. Successive coats should be applied as soon as possible after the underlying . The cement is spread evenly among the surface at a depth of about 3/8 of an inch thick. Moisten the surface with water before applying the second coat. It also doesn't have any information about applying the second coat other than the recommended thickness. This allows the cement to become hard enough to gain most of it's strength before the brown coat is applied. Allowing the scratch coat to cure properly, ensures that the brown coat and the rest of the stucco process adheres correctly. Curing. It gives the building additional time to "find itself" or settle before the finish coat is applied . Allow another 48 hours to moisture-cure the brown coat, which should also be 3/8 inch thick (or per the manufacturer's recommendations). Even after it dries out, humid environment can get it wet again. Cross-hatch the first coat of mortar with a trowel or piece of wire lath to provide good keys for the second coat. Complies with ASTM C 926 requirements for cement based plaster. Under dry ambient conditions, water based coatings such . 30151800. A traditional three-coat stucco system includes a water-resistive barrier (WRB), an independent bond break layer, wire lath, a scratch coat, a brown coat, and a finish topcoat.It's a proven and durable system, but it can be expensive and time-consuming, requiring a longer cumulative curing time. The first coat is the scratch coat followed by the brown coat which can be applied the next day after the scratch . Can Stucco Absorb Water? The bond between StuccoPrime and the stucco scratch coat continues to strengthen as all stucco layers are fully hydrated. This allows the cement to become hard enough to gain most of it's strength before the brown coat is applied. Cure for 18 to 24 hours. Typical projects will require several days of moist-curing time, plus a day or two of dry time. Working Time in Minutes. You will need approximately: lbs. The bummer is that the staining will continue to happen each time it rains or is damp out, but it will be less and less each time. Brown coat requires a minimum of 1 week cure time. Ideally, you should allow a week to pass before finishing the stucco. The answer requires a thorough explanation. Scratch coat =3/8 inch thick, brown coat =3/8 inch thick, and finish coat =1/8 inch thick. Not allowing the proper cure time can result in your scratch coat malfunctioning. Do not let the top coat dry quickly. Base coat: scratch and brown stucco is a gray, blended, water resistant, Laporte/lime cement-based, material used for scratch and brown coat stucco work. Stucco scratch, brown and finish coats Two or three coat system applications Application over lath Packaging Available in 80 lb (36.3 kg) bags or bulk bags. 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 three coat stucco applications over wire lath should not be applied below 45 degrees. The finish coat (about 1/8 inch thick) is applied over the previous two coats (totaling about 3/8 inch), so any hairline cracks are now covered. bags - 56 per pallet. But when the humidity is around 80%, one should not go for the moist-curing phase. 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. In many cases, you will also apply a foam that helps the stucco's structure get a better grip. the oven was build as flow: 1) 5 inch base with 3 layers of Re-bar (6x6 mesh) 2) 4 inches of insulating concrete (perlite (3x) portland (1x) mix 1:3. At a minimum, mist the scratch and brown coats at the start and again at the end of each calendar day.) It is very important to not let the brown coat dry out for at least 7 days, especially with the scratch coat situation he has. We think that if this wall is browned you will still have no strength in the stucco job. There should be some space between the wire mesh and the paper backing in order fully to embed the mesh in the scratch coat. There are several different types of stucco installations. Step 1: Remove Broken or Loose Stucco In order to repair stucco, the first step is to remove all broken or damaged stucco. I have done some research and keep coming up with a 60-90 day cure time for the new stucco before a primer and top-coat can be applied. Though, it can vary depending upon the portions of the mixing. Cure Time: The scratch coat should be allowed to moist cure for a period of 3-5 days. This is a common style for Spanish Lace stucco, smooth stucco, and dash stucco. By contrast, one-coat stucco has the potential to save time and money for builders, and it offers . Save Time: Scratch, brown and apply color coat the same day Conforms to: ASTM C1328*, ESR-2671, UBC 25-1* . The Finish coat is thinner than the scratch and brown coat and is the last coat applied . If the mesh is too tight against the sheathing there is no room to embed the stucco. Many experts believe this is beneficial to the plaster by providing a stronger bond between the two coats and enhanced curing of the scratch coat. . After mixing the brown coat, allow it to sit for 20 minutes or so before applying it to the moist surface of the scratch coat. CURING Provide sufficient moisture in the plaster mix or by moist or fog curing to permit continuous hydration of cementitious materials. An 8 feet x 20 feet x 7/8 inch thick stucco panel will weigh 1,600 to 1,800 pounds. 80 lb. Quikrete makes a variety of batches. In a traditional three-coat stucco system, the finish coat must be cured using the same practices as base coats. Finish coat. The three-coat stucco system total thickness is approximately in. 1139) is a portland cement based stucco used for construction and repair of stucco walls. Answer: Stucco is usually applied in three coats and is referred to as 7/8-inch, three-coat stucco. As a result, the extra materials and labor make three coat more expensive than the one coat option . 60. Mill-mixed perlite-aggregate gypsum plaster; requires only the addition of water at the jobsite. (coarse** sand). 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. The scratch and brown coats are Portland cement plaster, typically each approximately 3/8in. Projects in areas of extreme drought may require more intense moist-curing, but less dry time. Coverage Area (Sq. Identify where crumbling, loose pieces or cracked stucco is, and get started removing it. Scratching promotes a good mechanical bond between the scratch and brown coats and helps the scratch coat retain water during hydration. The first coat is known as the "scratch coat," the second is known as the "brown coat . Coat Type. Scratch and brown coat in a three coat stucco application. However, there is a section . Stucco is applied in three coats: scratch, brown, and finish. It is typically applied over rigid foam board and lath to provide an Energy Code . Spread the stucco over the entire surface, to a thickness of 1/8 to 1/4 inch. Under dry ambient conditions, water based coatings such You can smooth the coat with a float if you desire a smooth surface, or you can add a texture to it according to your preferences. in. Apply the Scratch Coat 6. What is Three Coat Stucco? The cure time between the scratch and brown coat in a Portland cement plaster is stated in the Uniform Building Code (UBC) and International Building Code (IBC) in chapter 25 tables as 48 hours. It is the principal mechanism of converting portland cement into a solid binder. 5. Available in: 50 lb. You will need approximately: gallons of TK-225 bonding add mix. 3) fire brick flat on bottom, with fire brick for dome sitting around it. This will prevent cracking. (The most effective procedure for curing and time between coats depend on climatic and job conditions. Curing Time (Days) 28. Cure Time: The brown coat requires a lot more time to cure (28 days is recommended). In hot or dry climates or windy weather, keeping the stucco moist during the curing period may require frequent wetting. The rough . Hydration is essential to achieving durable stucco. Standard single application Float finish or scratch and double-same day two coat application. Plaster is the general term for material that is applied to a wall surface in a thin layer. Prepare the Stucco Mix 5. QUIKRETE Scratch and Brown Base Coat Stucco (No. The standard curing time this coat is around 30 days. I've read all the instructions on the bag as well as the specification sheet online and it doesn't have any info about extended periods between coats, only says to let the base coat cure for a minimum of 48 hours. of 1/2" chopped fiberglass strands. The most effective procedure for curing and time between coats will depend on climatic and . The scratch coat is applied first to provide a strong base for the system. How long should brown coat cure? Apply the Final Layer Adding Color to Your Stucco Wall Different Stucco Finishes Cat Face Lace and Skip Sand/Float Dash Worm/Swirl or Putz Smooth Santa Barbara Allow the final coat to cure over the next several days. Use the trowel to apply the second coat. One coat has a base coat which takes the place of the scratch and the brown coats of the three-coat system. The NWCB "recommends' a minimum of 10 days. Textured-Skip trowel (Knock Down) is a same day two coat application with a float finish background. Jul 24, 2014 #2 It would probably be a waste of time damping it down as the scratch coat will have a waterproofer in it so no water absorption. Stucco Installation Over Wood: Conventional stucco over wood should always be applied as a three-coat system. Save Time: Scratch, brown and apply color coat the same day Conforms to: ASTM C1328*, ESR-2671, UBC 25-1 . StuccoPrime is not water reduced and will not emulsify when exposed to water. With a standard moist-curing process, you can expect your scratch coat to dry in one to three days after moisture stops being applied to the masonry. Can you scratch and brown coat same day? StuccoPrime dries slowly to allow time for the wet stucco scratch coat to be applied to the wet primer. Premixed. This permits complete curing of both the scratch and brown coats. If either coat flash-cures, it will be weak. You will need approximately: (#2)shovels of stucco sand. The brown coat should be rodded flat with a darby and straightedge, then moist-cured and checked for hardness. Cure Time: The scratch coat should be allowed to moist cure for a period of 3-5 days. Avoid excessive troweling. After scoring the surface, it is best to let the surface cure for 10 to 12 hours to make sure it has solidified. By code, builders should provide at least 48 hours of curing time after the first coat is applied and wait seven days after the second coat before applying the finish. Pre-blended with sand, requiring only the addition of water. The scratch coat should be 3/8" thick, and it should cure for 48 hours before the brown coat is applied. Step 5. Be patient and properly slow-cure (moisture applied) the stucco. Quikrete 80 lb. Base Coat Stucco can also be applied directly to masonry walls for a two coat application. It is sometimes called "traditional stucco.". wet stucco scratch coat. 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