Application is similar to threecoat stuccos, except that the scratch coat and the brown coat are combined in one thin coat. Plastic tape is removed after plastering to keep joint clear. Colored stucco or exterior stucco is a cementlime mix that is highly durable and cost efficient product for adding texture and color over onecoat or conventional stucco systems. Quikrete one coat 80lb premixed finish coat stucco mix. So thats going to sit on top of the instillation and then were going to apply our three coats. With proper flashing, a weather resistive barrier and weep screed, three coat stucco allows for drainage if water penetrates the system.
The scratch coat must be scored horizontally on vertical surfaces. With proper flashing, a weather resistive barrier and weep screed, threecoat stucco allows for drainage if water penetrates the system. Sikka bmi stucco instructions pdf 2018 sika corporation 201 polito avenue lyndhurst, nj 07071 usa tel. The construction foreman, roofing foreman and the stucco foreman must meet prior to installation of any windows, doors, soffits or roofing. Stucco exterior wall systems one and two coat details and.
Onecoat is most often applied over a foam board, not be confused with eifs exterior insulation finishing system. Stuccos big on block concrete masonry provides an excellent base for direct application of portland cement plaster in 2 or 3 coats, consisting of basecoats and a finish coat. Under dry ambient conditions, water based coatings such as latex paint can be applied after the product is hardened and dry which usually takes 4 hours. Facades stucorite is a reliable alternative to eifs and can be used in commercial and residential applications without any problems. Quikrete one coat 80lb premixed finish coat stucco mix in. The term one coat stucco refers to a blend of portland cement, sand, fibers, special proprietary chemicals and water. This measure guideline has been developed to help builders transition from using a traditional threecoat stucco wallcladding system to a onecoat stucco wallcladding system with expanded polystyrene eps insulated sheathing. All these systems apply a single base coat and a top coat with a total thickness of 28 to 12inch, compared to 78 to 1 inch for traditional threecoat stucco.
Page 3 of modern stucco can be applied as one base layer and a finish layer, which is thinner and faster to apply, compared to the traditional application of threecoat stucco. A threecoat conventional plaster system consists of a thicker plaster coat from 5 89 to 19 over a. Facades stucco exterior wall systems one and two coat is the same reliable stucco artisans have been using for centuries, but with a couple of technological twists. Listed below are links to omega products standard details for the akroflex eif systems, diamond one coat stucco systems, and three coat stucco systems. Here is some basic instruction on how to apply scratch coat stucco. One coat stucco has the appearance and advantages of traditional three coat stucco, including onehour fireresistiverated assemblies, but with. One coat is most often applied over a foam board, not be confused with eifs exterior insulation finishing system. Common installations include the stucco, some reinforced foam trim aesthetic pieces and a master wall superior finish. The unique design is engineered specifically for use with basf base coats as an overlay system applied to new or existing stucco portland cement plaster.
It is used as a finish coat for interior walls, exterior walls, ceilings and decorative detailing. Conventional stucco over wood should always be applied as a three coat system. Stucco wall methods and choices best practices guide. Threecoat stucco is recognized in the ibcirc building codes and remains one of the most popular exterior cladding choices for both residential, multifamily, and commercial projects. These details are drawn to scale and use general architect standards.
Apply stucco base coat in accordance with astm c926, the manufacturers instructions, and in. The one coat stucco system is a highly costeffective and resilient alternative to the three coat stucco system. Threecoat stucco is the traditional installation method. This measure guideline has been developed to help builders transition from using a traditional three coat stucco wallcladding system to a one coat stucco wallcladding system with expanded polystyrene eps insulated sheathing.
Three coat stucco is recognized in the ibcirc building codes and remains one of the most popular exterior cladding choices for both residential, multifamily, and commercial projects. Astm specifications, coatings, construction techniques, plaster, stucco introduction portland cementbased plaster has many useful applica tions. Typical paint system pva primer 1 coat stucco 2 coats fenomastic, durosan or jollyfix 2 coats other systems may be specified, depending on area of use storage. One coat or fiber reinforced stucco frs systems are a more recent. Introduced in the mid1980s, the one coat stucco system base coat consists of a blend of portland cement, sand, fibers and proprietary chemicals which results in a very effective system. One coat stucco combines the scratch and brown coat into a single application of 38 to 12 thick. Premium three coat stucco system diamond wall three coat diamond wall three coat is an excellent choice for scratch and brown coat in three coat stucco applications. The first coat is often referred to as the scratch coat, the second is the brown coat, and the third is the finish coat fig. Onecoat or twocoat stucco is a popular variation of the traditional threecoat system. For a threecoat system, the total nominal stucco thickness. To protect the structure from damage and your business from a lawsuit ensure the system has a complete drainage plane and carefully detailed flashing. Conventional stucco over wood should always be applied as a threecoat system.
Can be used as the scratch and brown coat in a conventional two or three coat stucco system. The approximately 78inch system is applied by hand or machine over an approved waterresistive barrier and metal lath. Portland cement plaster has many qualities that make it a desirable. This system uses onecoat to replace the scratch and brown coats of a traditional threecoat system. Stucco can be applied as a threecoat, twocoat, or onecoat system, depending on the type of stuccoing material used and the type of surface to which it is applied. Stucco is applied wet and hardens to a very dense solid. Under dry ambient conditions, water based coatings such as latex paint can be applied after the product is. The threecoat stucco system total thickness is approximately. This course will explain the benefits of three coat stucco systems, which include fire resistance, mold prevention, durability, low maintenance. Stucco is an attractive and durable cementbased coating frequently.
It is typically applied over a rigid foam board and lath to provide an energy code. The name onecoat is misleading, as two coats of stucco plaster are used, beginning with a. For a three coat system, the total nominal stucco thickness. The threecoat system uses a base layer, a fill layer, and a finish layer. Diamondshield is a balanced, opengrid triaxial glass fiber mesh that distributes stress across three directions. It is applied wet and hardens to a very durable solid. Stucco systems, whether traditional threecoat or an eifs.
Csi section 09 24 00 portland cement plaster fiber. One coat stucco assemblies are codeapproved proprietary systems that must be specified and installed per the manufacturers approved specifications and details. The overall effect of the eps insulating sheathing used in a. Successive coats should be applied as soon as possible after the underlying coat has sufficient strength and. So specifically designed for applying a three coat stucco system, or other types of stucco are available as well. Threecoat stucco application information sheet community development building and inspection 1800 w. The generic term stucco includes several variations including traditional threecoat stucco and master wallacrylic modified stucco with improved strength and crack resistance. These three coat stucco systems have stood the test of time because of their numerous advantages. Quikrete manufactures stucco base coat and finish coat mixes for three and twocoat applications, as well as a fiberglassreinforced stucco mix intended for onecoat use. Three coat stucco systems omega products international.
Do not proceed with installation until unsatisfactory conditions are corrected to satisfaction of architectengineer and installer. The finish coat is not considered a step because it is needed on every type of application that is used, so they are mainly referring to the stages up until the finish coat. An acrylic admix sold by the manufacturer is added to stucco finish to provide a chemical bond to the skim coat. Sma guide specification for 2coat portland cement plaster stucco applied to concrete or masonry walls 2017 note. This method speeds up the three coat stucco process by combining the scratch and brown coat into a single application of 38. Traditional portland cement plaster stucco is a timetested exterior finish. The onecoat system maintains the look of a traditional stucco system but uses only a base. The use of opentextured concrete masonry units promotes mechanical keying. A basic overview of the three coat stucco system youtube. The manufacturers offerings on colored stucco usually include a selection of aggregates for achieving various textures.
Three coat stucco application information sheet community development building and inspection 1800 w. Scratch coat 38 inch thick, brown coat 38 inch thick, and finish coat 18 inch thick. A one coat stucco system is a durable and effective wall cladding system when correctly. Old shakopee road bloomington mn 554327 ph 9525638930 fax 9525638949 tty 9525638740. A complete system can be described on a system sheet, where all parameters and special conditions could be included. Conventional stucco over masonry surfaces may be applied with two or three coats. Three coat stucco systems cementbased three coat stucco systems have been providing a longlasting, attractive cladding for buildings for over 100 years. Best practices and quality issues in residential stucco application basic stucco practice stucco is a cementitious mix of carefully proportioned materials cement, preferably low alkali additives including workability modifiers and lime sand, clean and graded water, potable typical threecoat stucco system. The one coat system maintains the look of a traditional stucco system but uses only a base. Document developed to help residential new construction builders transition from using a threecoat stucco system to a onecoat stucco system installed over 1 in.
The three coat system uses a base layer, a fill layer, and a finish layer. The thinner finish weighs from 5 to 6 pounds per square foot, compared to 9 pounds for threecoat, and it is costcompetitive with traditional stucco. Stopowerwall ci is a premium stucco system which provides heat, air and moisture management along with the best protective and aesthetic elements for a truly superior wall cladding. Premium three coat stucco system diamond wall three coat diamond wall three coat is an excellent choice for scratch and brown coat in threecoat stucco applications. However, this foam board does play a role in the problems that arise when installing one coat. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology plaster and stucco for concrete masonrytek 93a mortar, grout, stucco 2002 keywords. Armourwall 300 systems can also be installed at thicknesses designed to meet fireresistance ratings. The name onecoat is misleading, as two coats of stucco plaster are used, beginning with a base coat. However, this foam board does play a role in the problems that arise when installing onecoat. It combines stoguard air and moisture barrier, a drainage mat, type iv insulation, stopowerwall stucco and sto textured finishes into an integrated system. Tafs textured acrylic finishes tafs are excellent exterior finish options for stucco, concrete masonry units, tilt up, icf, and other compatible substrates that may be approved. The thinner finish weighs from 5 to 6 pounds per square foot, compared to 9 pounds for three coat, and it is costcompetitive with traditional stucco. Aug 07, 2014 here is some basic instruction on how to apply scratch coat stucco. From florida to minnesota, traditional stucco is a proven system that works in all climates.
A threecoat system uses a base of waterproof roofing paper that is. Designed to save material by functioning as an exterior cladding in thicknesses ranging from 38 to 112 designed to save time and labor by reducing the time required between trowel passes. The course will also explain in detail what codes are applicable for the different wall assemblies available to the use of three coat stucco systems. System diamond wall one coat stucco is a code compliant plaster system that creates a longlasting exterior cladding for residential and commercial projects. Color coat may be applied after the completion of water curing stucco mix per the color coat manufacturer.
These systems make intricate architectural details and ornamental shapes possible. Cement board md finish system consists of an acrylicmodified base coat with reinforcing mesh embedded and finish applied over an approved exterior cement board. Benefits of parexs armourwall 300 stucco systems include. This system uses one coat to replace the scratch and brown coats of a traditional three coat system. When applied to metal lath, three coats of plaster form a 22mm 78in. Downloading any specification is acknowledgement of reading and agreeing to the sma caveat. This very helpful document from tcc materials compare the specifications of threecoat conventional stucco with onetwo coat stucco systems in thickness, weight, fire ratings and other parameters. Three coat stucco one coat stucco and traditional three coat stucco are a material made of an aggregate, a binder, and water. This is why it is called a three coat system, lath, scratch and brown.
Threecoat stucco system with enhanced crack resistance. One coat stucco a custom blend of portland cement, sand, extenders, fiber reinforcement and modifiers. Designs all its products to work together, ensuring superior results. Stucco systems, whether traditional threecoat or an eifs, are highly prone to water infiltration. It is normally used when installing stucco over wooden sheathing, but can also be used on masonry surfaces if there is doubt as to their ability to hold the stucco securely. Threecoat stuccoing threecoat stucco is the oldest and most commonly used system.
All these systems apply a single base coat and a top coat with a total thickness of 28 to 12inch, compared to 78 to 1 inch for traditional three coat stucco. Sma guide specification for 3coat portland cement plaster stucco applied to framed walls 2017 specification. Stucco over rigid foam insulation building america solution. Diamond wall three coat omega products international.
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