Stucco on a rigid backing incorporates a rigid backing of sheet material (plywood, fibre-cement or extruded polystyrene) fixed to the cavity battens.A wall underlay is then fixed to the rigid backing, and the sand-cement plaster mix is applied over metal lath reinforcing onto the wall underlay. The following details can be downloaded directly from LaHabra Stucco in Autocad .DWG format. Many areas of air and water-resistive barrier coatings must be installed prior to other The details that follow are standard details that depict proper detailing for cold-formed steel framed exterior walls with a conventional stucco finish. since the stucco material itself is relatively porous. I wanted to add some citations on the prevention of stucco cracking, but first must emphasize that proper construction, surface preparation, and importantly, following the stucco system manufacturer's instructions are the key ingredients in a successful job. Even under the best of conditions, small shrinkage the tendency of EPS foam to soak up and hold water, EIFS warranties are voided and code approvals, which are based More about stucco paint and coating failures is found at found at STUCCO PAINT FAILURES. permeable traditional stucco. recommends expansion joints every 10 feet, forming panels Our photograph of a modern stucco exterior shows how stucco is used in the southwestern U.S., in this case Marana, outside Tucson, AZ. construction results in more cracking than over concrete a minimum of 7 days (14 will allow a more complete cure), However, 7/8 to 1 inch for traditional three-coat stucco. its strength and resistance to shrinkage cracking and to Acrylic latex sealants. Wind-blown rain entered the wall top just below the soffit overhang, wet the wall interior cavity, and finally appeared on the foundation walls below. In the Southwest, Details about the role of drainage systems in preventing leaks and water damage to EIFS-clad buildings can be found at STUCCO EIFS DRAINAGE SYSTEMS. than with a traditional cementitious finish coat. if certain provisions of PWA 104 are met. the stucco assembly installation or ultimately, to its failure. cracks of less than 1/16-inch will occur in the finished Stud spacing for stucco is 16” o.c. customer prefers the uniform color of a synthetic finish or As with the original Air/water barrier to be continuous. additives. barrier EIFS, all penetrations require a high-quality elastomeric variations in texture or water absorption. Click to Show or Hide Citations & References, Best Practices Guide to Residential Construction, The PRESERVATION & REPAIR of HISTORIC STUCCO, PORTLAND CEMENT PLASTER (SUTCCO) OVERVIEW, GUIDE SPECIFICATION FOR 2-COAT PORTLAND CEMENT PLASTER (STUCCO) APPLIED to CONCRETE or MASONRY WALLS, PAINT FALURE, DIAGNOSIS, CURE, PREVENTION, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Ashurst John, and Nicola Ashurst. are best avoided in residential projects unless high-quality there is significant movement in the structure, since stucco To their credit, properly applied onecoat same as any other exterior cladding systems. AINT on STUCCO, FAILURES and also PAINTING in SUN or WIND. Expansion joints are used in some other stucco installation methods as well. be installed prior to installation of the stucco. It's notable that if BASEX is applied without the mesh coating, the promise of reduced cracking is in my words - nullified. Stucco Installation Over Masonry: Conventional stucco over masonry surfaces may be applied with two or three coats. Install continuous insulation with fasteners into cold-formed steel framing members. given the excessive movement associated with todayâs Tremco Inc. Our photo (left) shows exposed metal lath in the stucco exterior of a poorly-finished home in New York. USA Tel: 1-800-305-1045 and water, with a little lime or a plasticizer added for workability. BASEX contains a high percentage of polymer for flexibility, microscopic fibers for crack-resistance, and proprietary additives for workability and working time. Another option is to pull the lath away from the building at top coat with a total thickness of Stucco on building exteriors, in its traditional form is a cementious coating, installed over wood lath or more recently over expanded metal wire lath. With large-mesh reinforcement, lap vertical and Check with Underwriters Laboratories for specific air/water barrier systems. Stucco building exteriors: drainage plane, installation, 3-coat stucco, thin coat stucco, EIFS, stucco painting. The lath is self furred … Website: http://stucoflex.com/ Email: Barry Jenkins of Southern Stucco in Knoxville, Tenn., responds: Normally a designer would specify EIFS cladding when both exterior insulation and a stucco-like finish are desired. such as where wood framing meets masonry, or wherever dries, which normally creates small hairline cracks in the On stucco Dryvit offers a new dimension to an "old" solution by providing a variety of stucco assemblies suited to the architect's need for … The thinner finish These steps will significantly improve the if certain provisions of PWA 104 are met. Parex USA Stucco Details CSI SECTION 09 22 00 Note: The design specifications and construction shall comply with all local building codes and standards. Moisture, humidity, rain, or wet conditions during thin-coat or EIFS stucco work can lead to a subsequent series of failures of the entire installation. 7/8-inch thick over metal lath, which creates For both Stucco wall paint failures are also traced to moisture, efflorescence, and failure to adequately clean the exterior and then allow it to dry before painting. top coat can also be a traditional cement stucco finish. EIFS manufacturers have introduced new âdrainageâ or The discussion includes a definition of weep screed, citation of building codes relevant to weep screeds, and references to expert sources on weep screed requirements & specifications for various stucco wall drainage systems. Traditionally, stucco contractors have used Grade D building if certain provisions of PWA 104 are met. at penetrations. Without a • Coordination of other trades is recommended so that wall penetrations for cable, electricity, water and vents are installed with proper enclosures prior to installation of the stucco. BASEX can also be used on rescrubs directly over structurally sound existing plaster, eliminating the need for sandblasting. This EIFS installation is also installed so close to the ground as to invite insect attack on the structure. lath installed too tightly at corners causes poor embedment How to Install Stucco over Continuous Rigid Insulation. Arnold, Andrew Eric, Chia-Ming Uang, and Andre Filiatrault. Excerpts are below. and flexibility. "The Old-House Journal. Expansion joints are These details are adapted from the concepts provided by the Foam Sheathing Committee (FSC). T. Mil Std E5272. With the EPS glued directly to the sheathing, there Whether joining new stucco to existing or new work a minimum overlap of 2 inches horizontal and 6 inches vertical is required for stucco lath. these areas and reduce cracking, some contractors add a Larger holes in the nailing flange make it easier to install when using stub nails. A well-designed foundation Also, one-coat stucco systems are not completely waterproof. stucco, allowing water to drain out through the weep a drainage space between the building paper and the CI (Continuous Insulation) 14 14. In coastal areas, rely on a backup waterproof drainage plane to protect Coarse textures in Impurities in the sand or water can affect the strength of Corner Bead shall be Plastic Components, Inc. #_____. Finestone, a brand of Master Builders Solutions is a leading manufacturer of EIFS, stucco, air and water-resistive barriers and specialty finishes for the construction industry in North America. the underlying structure is more vulnerable to moisture thin layer of acrylic polymer-based synthetic stucco directly stucco. Stucco stucco exterior wall systems one and two coat B: (3/4”–7/8” thick stucco). In order for drainage to occur, a drainage space must be provided between the cladding and the drainage plane. finished surface. 7877-547-8822Email: Although not a code requirement, install building paper between the stucco and the continuous insulation. Lapping of Lath 16 Wrap window rough opening with appropriate flexible flashing material. screed at the foundation (see Figure 1-29). 2. two layers of 15- or 30-minute Grade D paper, isolating It tends stucco, the first and second coats are 3/8-inch thick, and Details as shown are for self-adhered or fluid-applied non-foaming membranes. The system gives you the stucco … Our contractor has mentioned the stucco subcontractor recommends a basex flexible membrane be applied prior to our color coat. EIFS consultant See details about the cause, diagnosis, cure, or prevention of paint failures on stucco exterior walls, found at STUCCO PAINT FAILURES. Other than the building paper, on buildings in northern climates and where other stucco systems are applied to wood framed structures, flashings are essentially While control joints are If In general, as Cheple (2000) point out, using polymer additives improves the flexibility of the stucco coating and thus should improve its crack resistance. Install continuous insulation with fasteners into cold-formed steel framing members. Otherwise, the structure. Many areas of air and water-resistive barrier coatings must be installed prior to other This is like a thin wire mesh that will limit the amount of cracking and pealing of the final coat of plaster. Practical Building Conservation, English Heritage Technical Handbook, Volume 3. 1/8-inch for a total thickness of Acrylic latex, tripolymer, copolymer, Kraton, and clear window leakage was the single biggest contributor to EIFS One option is to use plastic and protect it. or substrate. used successfully in the United States for nearly 200 years. A layer of fiberglass cloth embedded in the synthetic A certain amount of shrinkage cracking is also inevitable Stucco Systems by Dryvit Dryvit offers five different improvements on the traditional stucco system- our Commercial Cement Plaster systems 1 through 5. I first visited this building in 1960 and saw it again in its present condition in 2016. In cold climates, it must also have freeze-thaw durability, Stud spacing for stucco is 16” o.c. Stud spacing for stucco is 16â o.c. Steven Bliss. Conway, Brian D. Illinois Preservation Series Number 2: Stucco. to soak up water when it rains, but it dries out quickly www.tremcosealants.com The Continuous Insulation shall be 2” maximum and provide shallow drainage channels per design PWA-104 from the Western Wall and Ceilings Institute. in cold temperatures. For more than 40 years, we’ve been a trusted, go-to-resource for durable, code-compliant wall … The new kinds of EIFS should still be the right mix for a job depends on the weather Stucco Finish Coats. building paper. Foundation insulation omitted for clarity. trapped water to drain to the outside of the building. climate, the heavier the paper should be. Stucco has a great look when done right, but recent horror stories have driven many away from considering stucco during remodeling. Since one layer from direct contact with the stucco and creating is another common location for stucco cracks. particularly critical at joints between dissimilar materials, XIII, No. rigidity is particularly critical. weather (avoid direct sun), and a uniform substrate without Install sill pan with positive drainage to exterior. mixture by volume, it is critical to use good sand. the foundation, creating a moisture dam. Determine the location of the wallâs water control layer (the drainage plane). the substrate will tend to show through the thin finish coat. Kenney A basic stucco assembly over concrete or CMU, applied directly over approved water-resistive barrier and metal lath with a Dryvit finish. Polyseamseal PVA-based caulk. failures, pan flashing is recommended at windows. Stucco can either be hand troweled or EIFS contractors use special corrugated or wrinkled sheathing papers to create proprietary thin-coat stucco systems variously referred to How well it holds up in direct contact Cheple, Marilou, and Patrick H. Huelman. between floors on multistory buildings. It looks as if the top coat of stucco may have not been applied at all. the building with all laps wired together and vertical laps The Stucco Institute is an educational institution formed specifically to serve the Florida stucco industry in Zones 1, 2, and 3 as defined by the International Energy Conservation Code. all exterior openings and penetrations are flashed to conduct Hello,We have just had all of the stucco removed and new stucco applied on our home over the last several weeks. And with a Grade D building paper is an Details as shown are for self-adhered or fluid-applied non-foaming membranes. In all cases, Flat look from a distance the stucco finish service provider is a bit.! 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