The overall thickness of this coat should be an inch for 2-coat processes and around inches for 3-coat work. Over Masonry Stucco Repair. . 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. Apply the base coat stucco using a square trowel held at a 45 degree angle. I would suggest that you look at a new product that passed the large missle impact test in Fl with a thickness of only as thick as a nickel. How thick is exterior stucco? 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. For traditional stucco, a mechanical attachment is required (metal lath screwed to the wall through the plastic webs, or similar attachment). Spread the base layer on the chimney to a thickness of the wood strips so that the stucco is even with the top of the strips. . The finish coat is applied to a predamped, but still absorptive, base coat to a thickness of about in. Applies directly over EPS, stucco or (CMU) cement block etc. However, the WRB (building paper and house wraps) prevents the bond between the plaster (stuc-co) and the concrete. Conventional stucco over wood should always be applied as a three-coat system. . Step 5. called Hard Coat Stucco, One Coat Stucco or Traditional Stucco Historically, Hard Coat Stucco is applied in three separate coats; each coat is permitted to cure for up to two weeks; final thickness averaged from 3/4 to 2 inches Stucco application has evolved to save time, labor and material; the process and blend is called One Coat Stucco If. 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. Three Coat Application: At metal lathed surfaces, apply scratch coat to a nominal thickness of 3/8 inch, brown coat to a nominal thickness of 3/8 inch, and finish coat to a nominal thickness of 1/8 inch. Always refer to the fire-rated assembly test before making an assumption. To solve out-of-plane conditions, a series of engineered reinforced mortar lifts may be needed. BuildCrete has been used on ICF construction for its durability, strength, and ease of application. The structural backup is concrete masonry, with rigid insulation between Z-channel furring. Stucco thickness depends on the backup system and on whether or not lath is present. The scratches will make the next layer stick better. Let the scratch coat cure for 24 to 48 hours, keeping the . Commercial Cement Plaster (CCP) 2. Microsoft Word - stucco over cmu (SMA) Author: HAWKFAN12 Created Date: 2/13/2020 5:18:35 PM . A variety of finish options are available including ColorTek stucco, AkroFlex acrylic stucco . Stucco over Masonry, Concrete or Concrete Masonry Units (CMU)- Caveats: Lath is option and intended for walls requiring cement thickness greater than 5/8 inch. Fibered Stucco may be used in place of TOTAL WALL Hard Coat. If you are contracting this out ask your contractor to furnish the ASTM standard for Stucco over NEW CMU it will state the requirements & method to use. Myth #1: Stucco on lath over CMU/concrete is superior to direct-applied. Specifics for these wall assemblies and allowable continuous insulation thickness are listed in the ICC Evaluation Report ESR 2564. Omega . Properly done, it's a great combina on. Then three coats of masonry stucco cement are applied in a 3/8-inch scratch coat, followed by a 3/8-inch brown coat, and finally a 1/8-inch finish coat. The outer layer, TOTAL WALL Finish, is an all-acrylic, pre-textured and pre-colored finish coat at approximately 1/32" to 1/8" thickness depending on the desired texture. 12. Next, screed the stucco to a uniform depth of inch. Direct Applied applications over concrete masonry may use a 1/4" ground-casing Use firm trowel pressure to force the stucco into the lath. 3. The two materials are made from the same basic ingredients and are extremely compa ble. The ASTM will also give the correct standards for thickness for Stucco over CMU along with the correct mix design. The CMU were installed in August (6 months ago). CCP 1 is a traditional stucco system (old) over concrete or CMU construction with modern polymer technology applied to the finish (new), providing the traditional stucco assembly . This coupled with the fact that attaching a lath and WRB to concrete . For cast-in-place or precast concrete, the thickness for two-coat work is 3/8 inch. In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. Provides a hard, durable single coat over EPS and other exterior walls sheathings, over 3500 PSI compressive strength. Scratch coat =3/8 inch thick, brown coat =3/8 inch thick, and finish coat =1/8 inch thick. All three systems consist of a 3/8-inch minimum thick layer of Diamond wall base coat that is embedded in metal lath. If you choose to do so, plan a total thickness stucco approximately 3/8 inch (9.5 mm) for concrete, and inch (13 mm) for masonry. Stucco stairs, porches, & rails; Styrofoam Shapes, plaster repairs, cracks; Contact Me; You are here: Home / Videos / Stucco thickness over a cinder block wall. Attachment of Metal Plaster Bases to Masonry/Concrete 17 18. Apply the Scratch Coat. 2D DWGs. As mentioned above, mechanical attachment of insulation boards is not the preferred choice unless a smooth and/or painted surface will be the substrate. The difference in thickness with adjacent stucco also increases the likelihood of cracks developing. Orlando, Florida 32822 Stucco thickness over a cinder block wall. If you have cinder blocks and want to stucco over them, you would pressure wash first, then apply a base coat, then when it sets and cures usually about two weeks, you can apply a color . . Maximum Variation from True Flatness: 1/8 inch in 10 feet. Access or vehicle ramps which rise to the interior finish floor elevation for the width of such ramps only. Work from the bottom of the stucco wall up and apply at a thickness of about inch over the entire area. Apply the brown coat after a few hours. If your concrete-block basement walls are dry and free of . What I would do with a ICF is apply a 2" thick foam(eps 1.5# density) that has a finish like brick, stucco or wood siding then a 2 man crew sprays a 2000 sq house in less than 2 days. If water sprinkled on the wall is not readily absorbed, then the surface must be handled differently. . Nominal thickness = 7/8". Table 4 summarizes the recommended nominal plaster coat thicknesses for both two and three coat work. Therefore, thickness could be as thin as 3/4" and thick . 2. Generally, stucco that is applied directly to solid surfaces is placed in two coats that together total 5/8 inch of thickness. Ann MacKinnon, office manager of LaVereda developer Communico, said that The company often used Thermax over concrete block walls and under stucco on buildings, as do most builders in the Santa Fe area. Some contractors will use paper or house wrap behind the stucco, but it's not necessary. Paint or decorative cementitious finish less than 5 / 8 inch (17.1 mm) thick adhered directly to the masonry foundation sidewall. Two-coat applications are only for use over solid plaster bases without metal lath. There are two basic stucco applications used in Florida. Average Cost to Stucco a House The cost to stucco a 1,500-square-foot home is approximately $9,525, with most homeowners paying between $8,000 and $11,100 for materials and equipment, as well as planning, area preparation and protection, setup, stucco . EXTERIOR SYSTEMS Stucco Over Concrete or Masonry Walls 600-609 01/05 . 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. Create horizontal grooves that are 1/8 (3mm) in thickness on your wall using a slotted palette, while keeping it perpendicular to the wall. 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. Stucco thickness on Cinder block or CMU walls. Apply a thin layer, about " (6.4mm) or " (12mm) using the trowel, and wait for it to dry slightly. Sealing the CMU before stucco application renders this process null, and results in the future debonding of the stucco from the CMU. 3D PDFs. Stucco can be applied directly over the ICF, without a membrane above grade; below-grade requires waterproofing). The bond and/or thickness of the cement plaster will determine the need for a lath. . Boards are typically square cut and the largest common board size is usually 2 x 4. Hello everyone, On this short video clip I am explaining the Stucco thickness on Cinder block or CMU walls. August 5, 2016 . You can apply stucco over wood sheathing, masonry or brick. 2D PDFs. Synthetic stucco consists of a polymer based laminate that is wet-applied, usually in two coats, to rigid insulation board that is fastened to the wall with adhesive, mechanical fasteners, or both. A basic stucco assembly over concrete or CMU, applied directly over approved water-resistive barrier and metal lath with a Dryvit finish. The surface of the scratch coat needs to be perfectly vertical and must be the required thickness. Lapping of Lath 16 SECTION C: MIXING & APPLICATION 17. StuccoMax is designed to be environmentally responsible, utilizing natural limestone sand and NO Portland type cements, it is sustainable and emits no pollutants. What is the correct thickness of stucco? Requires a three-step process for a 7/8" thickness total (3/8" scratch coat, 3/8" brown coat & 1/8" finish texture) . Lathing over Framed Construction 16 16. (3.2 mm). Allow the final coat to cure over the next several days. Project Instructions Step 1 Attach two layers of Grade D, waterproof building paper using galvanized nails or staples in a shingled fashion over the wall sheathing extending 16 inches around all corners. Use the trowel to apply the second coat. Make sure you apply the mix carefully, covering entire surface with a thick coat. Starting the Installation: Standard - Non WaterMaster Stucco System 12 13. Please, feel free to check out our recommended tools on the Amazon website below.https://www.stuccoplastering.com/tools/Kirk Giordano Plastering Inc.Howdy am. Apply a thin coating, approximately 1/4 " (6.4mm) or 1/2 (12mm) with the trowel, then wait till it dries. Despite protestations by the stucco sub, stucco was installed on lath over concrete per the architect's direction.In our work as forensic . This is usually after 4 - 5 hours. Most all fire-rated assemblies require 7/8-inch and some require a full 1-inch thick cement plaster. Step 2 Install trim accessories. Stucco Thickness Over Block / CMU Walls is inch If your house or exposed basement wall is a masonry wall, sometimes referred to as concrete or cinder block, or CMU (concrete masonry unit) the thickness required is not 7/8 inch but is usually 1/2 inch; consisting of a 3/8 scratch coat and then a 1/8 inch finish coat over the scratch coat. Final coat is the color coat, about 3/16" thick, for a total stucco thickness of about 7/8" I have never heard of 2-coat stucco around here, although there is a one-coat stucco-like elastomeric product that is applied about 1/4" thick, over foam, one trade name being Dryvit. Download File 2018-BuildCrete-Stucco-Plaster-Pool-Plaster-Brochure-1.pdf - 1 MB. Step 5 thickness allowed by c926 over the 2 narrower block. A good rule of thumb regarding R Value is that for every 1" of foam (thickness) it equates to roughly an R-4 rating. The correct thickness is then 5/8 inch. Thickness of foam can be greatly increased beyond two inches limited for cement stucco. Senergy Details. CCP 2 is a traditional stucco assembly over wood or steel frame construction with a Dryvit approved sheathing and a Dryvit polymer finish. Application When applying this coat, don't wait for the scratch coat to completely dry. Dryvit Commercial Cement Plaster (CCP) is a single source stucco solution combining the best of old and new world technology to create a better stucco wall assembly. It works like a primer that prepares the surface for the final coat, making it smoother and bond better. CI (Continuous Insulation) 14 14. Get started with the application over the cinder wall using a trowel. The finish coat is applied from the top down and the whole wall surface must be covered without joinings (laps or interruptions). Use required pressure so as to press the mix into the wall as you go on applying it. Approved One-coat Stucco assemblies offer other options. The cement is spread evenly among the surface at a depth of about 3/8 of an inch thick. Unscrew the wood strips and fill in the space with stucco. Myth #1: Stucco on lath over CMU/concrete is superior to direct-applied. The minimum thickness over framed walls is 3/4-inch. Cement Board Stucco (CBS) 1000 CI with MaxGrip Veneer Mortar. Provide a drainage gap in front of the water control layer. Concrete block makes an excep onal base for Port-land cement-based plaster (stucco). Access or vehicle ramps which rise to the interior finish floor elevation for the width of such ramps only. Wait for it to stiffen, and then scratch the surface with a raking tool to form 1/8-inch deep horizontal grooves. Click to expand. The scratch coat must be scored horizontally on vertical surfaces. BuildCrete is a true one-coat finish designed to adhere directly to any EPS foam, CMU block, DensGlass, Securock, concrete and other building materials. Channeled Adhesive CI Design with MaxGrip Veneer Mortar. Thanks to modern cement, you can apply it as soon as the base coat is rigid enough to withstand cracking. One-coat systems may be applied as thin as 3/8-inch. The first coat you apply to the concrete wall is the scratch coat. For unit masonry, that thickness is inch. Polymer based (PB) systems, sometimes known as thin coat, soft coat, or flexible finishes, are the most common. A code approved water resistive . Depending on the contamination, you might only need to wash with water. Wire stucco lath is placed over the foam insulating board and attached to the masonry below using concrete nails. Stucco Thickness Over Block / CMU Walls is inch If the stucco is applied too thick, there is a tendency for the stucco to crack and if it's too thin, the mortar joints between the blocks may show through the stucco; thus, the wall loses part of its aesthetic look or appeal. 2. 3) Foam Insulating Board: The foam usually acts as a major insulator for the wall and can come in different thicknesses (ranging from 1" - 6") and the thicker the foam, the more R Value you can get out of your walls. Specification: SMA Guide Specification for 3-coat Portland Cement Plaster (Stucco) applied to Framed Walls (2017) Specification: SMA Guide Specification for 2-coat Portland Cement Plaster (Stucco) applied to Concrete or Masonry Walls (2017) Note: Downloading any "specification" is acknowledgement of reading and agreeing to the SMA "Caveat . Florida Lath & Plaster Bureau 6353 Lee Vista Blvd. Accessories 1. INSULATED MASONRY VENEER SYSTEM. ASTM C926, Standard Specification for Application of Portland Cement-based Plaster , includes a Section 5.2, which discusses remedies when bond cannot be achieved over solid bases. Spray the cinder blocks to dampen them. World's First and Only Thermal Stucco, Fire-Resistant Stucco, Water-Resistant Stucco, Light Weight Stucco, Sustainable Stucco, High Crack Resistant Stucco, Vapor Permeable Stucco, Ecologic Stucco, Mold Resistant Stucco, True Green Building Material, Sustainable Insulation, LEED Friendly, Title 24 Compliant, Acoustic Plaster, Precast Concrete . Leave a thickness of about inch (6.4 mm) for the final coat. 09.070.0103: Stucco Assembly - Stucco Over CMU with Insulation This detail shows a three coat Portland cement stucco assembly applied over self-furring lath with two layers of weather resistive barrier (WRB) behind the lath. Install stucco as an exterior wall cladding over rigid foam insulation with proper preparation to provide water management as well as a sound substrate for the stucco. Place a flat edge over the strips and drag it to remove excess stucco. A stucco application consists of using a weather-resistive barrier with a metal lath that is attached to the substrate of the building. Apply by hand trowel or plaster gun to a minimum thickness of approximately 1/4 inch (5 mm) On lathed construction the total thickness can be up to 1 inch (25 mm) Using a trowel or plaster pump, apply U-STUCCO XPX to the properly prepared surface. Determine the location of the wall's water control layer (typically behind the insulation over the exterior sheathing). srmi.biz 3.resulting plaster thicknesses in excess of the allowances of table 4 of astm c926 to be evaluated by a design professional for augmentation requirements of section 6.2 of . Spread the stucco over the entire surface, to a thickness of 1/8 to 1/4 inch. Screed the material flat to a uniform 3/8-inch thickness with a straight-border darby or a straightedge. These are direct-applied systems, meaning that there is no metal lath involved. A 4-inch (102 mm) inspection space above patio and garage slabs and entry areas. Download. astm c90 compliant concrete masonry units stucco thickness variations due to allowable cmu size tolerances notes . PART 1 - GENERAL 1.1 SECTION INCLUDES Repairs over CMU blocks or other masonry surfaces require that we remove all loose stucco, apply a masonry bonding agent, and finally apply stucco and textured feathering around the patch. After the cement is on the wall, a scratcher is used to make horizontal lines in the stucco mix, in order for the next coat (the brown coat) to stick to it. Diamond Wall One Coat is available either as the Diamond Wall Insulating System, Diamond Wall System, or the Diamond Wall PM System.