Myth #1: Stucco on lath over CMU/concrete is superior to direct-applied. Use firm trowel pressure to force the stucco into the lath. 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. Microsoft Word - stucco over cmu (SMA) Author: HAWKFAN12 Created Date: 2/13/2020 5:18:35 PM . How thick is exterior stucco? Download. 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. 5. Make sure you apply the mix carefully, covering entire surface with a thick coat. 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. 12. 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. Lathing over Framed Construction 16 16. 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. Technical Bulletin, Stucco over metal lath attached to CMU PUSA 66-12.pdf The Armourwall 100 WaterMaster System is qualified on fire rated and non-combustible construction. (3.2 mm). Lapping of Lath 16 SECTION C: MIXING & APPLICATION 17. Paint or decorative cementitious finish less than 5 / 8 inch (17.1 mm) thick adhered directly to the masonry foundation sidewall. 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. You can apply stucco over wood sheathing, masonry or brick. This coupled with the fact that attaching a lath and WRB to concrete . The scratch coat must be scored horizontally on vertical surfaces. Stucco thickness on Cinder block or CMU walls. 7 What should the thickness of stucco be over a CMU wall? Hello everyone, On this short video clip I am explaining the Stucco thickness on Cinder block or CMU walls. Polymer based (PB) systems, sometimes known as thin coat, soft coat, or flexible finishes, are the most common. Step 5 One-coat systems may be applied as thin as 3/8-inch. 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. Where stucco has been erroneously packed out without reinforcing, a fix . There are two basic stucco applications used in Florida. 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 . Thickness of foam can be greatly increased beyond two inches limited for cement stucco. 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 . The bond and/or thickness of the cement plaster will determine the need for a lath. Depending on the contamination, you might only need to wash with water. Lath, Trim-Accessories 15 15. Therefore, thickness could be as thin as 3/4" and thick . Orlando, Florida 32822 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. The finish coat is applied from the top down and the whole wall surface must be covered without joinings (laps or interruptions). 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. Always refer to the fire-rated assembly test before making an assumption. TIP: vertical seams should be overlapped by 6 inches and horizontal seams should be overlapped by 4 inches. For unit masonry, that thickness is inch. A good rule of thumb regarding R Value is that for every 1" of foam (thickness) it equates to roughly an R-4 rating. Myth #1: Stucco on lath over CMU/concrete is superior to direct-applied. Download File 2018-BuildCrete-Stucco-Plaster-Pool-Plaster-Brochure-1.pdf - 1 MB. Place a flat edge over the strips and drag it to remove excess stucco. PART 1 - GENERAL 1.1 SECTION INCLUDES August 5, 2016 . It works like a primer that prepares the surface for the final coat, making it smoother and bond better. A 4-inch (102 mm) inspection space above patio and garage slabs and entry areas. It is a myth that stucco on lath over CMU/concrete is superior to direct-applied, as illustrated by the cracks in this hotel wall. CI (Continuous Insulation) 14 14. Load stucco on a hawk and then take it on trowel for application. 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. 2. 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 . 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 . 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 . The thickness can be one-eighth- to one-half-inch, depending on your local building codes. Fibered Stucco may be used in place of TOTAL WALL Hard Coat. The overall thickness of this coat should be an inch for 2-coat processes and around inches for 3-coat work. 2D PDFs. The minimum thickness over framed walls is 3/4-inch. This is usually after 4 - 5 hours. 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. astm c90 compliant concrete masonry units stucco thickness variations due to allowable cmu size tolerances notes . Screed the material flat to a uniform 3/8-inch thickness with a straight-border darby or a straightedge. Application When applying this coat, don't wait for the scratch coat to completely dry. . Step 5. A code approved water resistive . Step 2 Install trim accessories. The surface of the scratch coat needs to be perfectly vertical and must be the required thickness. Direct Applied applications over concrete masonry may use a 1/4" ground-casing . These are direct-applied systems, meaning that there is no metal lath involved. Cement Board Stucco (CBS) 1000 CI with MaxGrip Veneer Mortar. The correct thickness is then 5/8 inch. Stucco can be applied directly over the ICF, without a membrane above grade; below-grade requires waterproofing). Apply a thin coating, approximately 1/4 " (6.4mm) or 1/2 (12mm) with the trowel, then wait till it dries. A variety of finish options are available including ColorTek stucco, AkroFlex acrylic stucco . 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. Looks aren't an issue since this is the base layer. Properly done, it's a great combina on. The difference in thickness with adjacent stucco also increases the likelihood of cracks developing. With modern cement on a rigid surface, there is no need to wait for the scratch coat to dry completely. Work from the bottom of the stucco wall up and apply at a thickness of about inch over the entire area. If your concrete-block basement walls are dry and free of . 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. Provides a hard, durable single coat over EPS and other exterior walls sheathings, over 3500 PSI compressive strength. Stucco stairs, porches, & rails; Styrofoam Shapes, plaster repairs, cracks; Contact Me; You are here: Home / Videos / Stucco thickness over a cinder block wall. Leave a thickness of about inch (6.4 mm) for the final coat. Next, screed the stucco to a uniform depth of inch. 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. For cast-in-place or precast concrete, the thickness for two-coat work is 3/8 inch. Maximum Variation from True Flatness: 1/8 inch in 10 feet. 2. The first coat you apply to the concrete wall is the scratch coat. INSULATED MASONRY VENEER SYSTEM. To solve out-of-plane conditions, a series of engineered reinforced mortar lifts may be needed. Conventional stucco over wood should always be applied as a three-coat system. What is the correct thickness of stucco? 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. The two materials are made from the same basic ingredients and are extremely compa ble. Specifics for these wall assemblies and allowable continuous insulation thickness are listed in the ICC Evaluation Report ESR 2564. Two-coat applications are only for use over solid plaster bases without metal lath. Applies directly over EPS, stucco or (CMU) cement block etc. StuccoMax is designed to be environmentally responsible, utilizing natural limestone sand and NO Portland type cements, it is sustainable and emits no pollutants. Some contractors will use paper or house wrap behind the stucco, but it's not necessary. Allow the final coat to cure over the next several days. srmi.biz Spray the cinder blocks to dampen them. Unscrew the wood strips and fill in the space with stucco. Apply the brown coat after a few hours. All three systems consist of a 3/8-inch minimum thick layer of Diamond wall base coat that is embedded in metal lath. 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. Apply the base coat stucco using a square trowel held at a 45 degree angle. Over Masonry Stucco Repair. For traditional stucco, a mechanical attachment is required (metal lath screwed to the wall through the plastic webs, or similar attachment). Boards are typically square cut and the largest common board size is usually 2 x 4. Click to expand. . CCP 2 is a traditional stucco assembly over wood or steel frame construction with a Dryvit approved sheathing and a Dryvit polymer finish. Stucco thickness depends on the backup system and on whether or not lath is present. Sealing the CMU before stucco application renders this process null, and results in the future debonding of the stucco from the CMU. Omega . Use the trowel to apply the second coat. Spread the stucco over the entire surface, to a thickness of 1/8 to 1/4 inch. 3D PDFs. Attachment of Metal Plaster Bases to Masonry/Concrete 17 18. Wire stucco lath is placed over the foam insulating board and attached to the masonry below using concrete nails. In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. Create horizontal grooves that are 1/8 (3mm) in thickness on your wall using a slotted palette, while keeping it perpendicular to the wall. Most all fire-rated assemblies require 7/8-inch and some require a full 1-inch thick cement plaster. Despite protestations by the stucco sub, stucco was installed on lath over concrete per the architect's direction.In our work as forensic . 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. Diamond Wall One Coat is available either as the Diamond Wall Insulating System, Diamond Wall System, or the Diamond Wall PM System. Apply the Scratch Coat. 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. 3. If water sprinkled on the wall is not readily absorbed, then the surface must be handled differently. 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. Starting the Installation: Standard - Non WaterMaster Stucco System 12 13. 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