stucco control joints

Removable tape has been provided to insure a clean joint after stucco application. The terms cement plaster and cement stucco are used interchangeably. q Expansion/Control joints q Window flashing q Parapet cap flashing q Cleanup q Shipping. One-piece control joints are used to handle the contraction of the mortar mix, as well as minor expansion and contraction of the stucco due to temperature and humidity changes. A control joint will not stop stucco from cracking if the stresses imposed upon the stucco membrane are greater than can be dissipated by the stucco and/or the control joint. Before 2006, ASTM C1063 was a voluntary standard that design professionals and contractors could agree to follow for a stucco installation, but its practices were not mandated by any legal authority. Vinyl Control Joint with Removable Tape is an improved version of the “M” type expansion joint. Detail: Control Joint at Floor Line (2016) Detail: Kick-Out Flashing for Stucco (2019) Detail: Sill Pan for Nail-Flange Windows (2020) Detail: Cantilevered Deck Joist – Stucco (2020) Detail: Stucco Parapets (2020) Detail: Corners for Stucco (2020) Detail: Window details for Stucco (2020) Detail: Stucco @ Masonry Chimney (2020) As most substrates and adhesion materials are concrete products, the primary movement of the substrate is shrinkage. Control joints are not intended to accommodate structural movement of the wall assembly. However, I would not force my personnel preference on anyone who prefers to have the lath discontinuous. (3.2 mm) or as required It is not necessary and in fact can be detrimental to cut the lath behind the control joints. This turn of events has resulted in an increased sense of urgency to modify ASTM C1063 and its companion standard, ASTM C926, Standard Specification for Application of Portland Cement-Based Plaster, so that they leave room for other proven acceptable practices that do not currently appear in the documents. Thin brick is unlike regular facing brick when it comes to expansion joints. Per ASTM, lath should be discontinuous at all control joints to allow the movement of the planes on either side of the joint not to influence the plane on the other side. Very few, if any, outside engineers, consultants, attorneys, etc., were a part of developing these standards.”, Later in the same document: “The ASTM C1063 committee of today is for the most part driven by consultants, engineers and manufacturer representatives. An expansion joint in stucco is a two-piece slip joint that is installed at a similar expansion joint in the structure of building. The separation spacing shall be not less than 1⁄8 in. Control joints constructed with special unit shapes, as shown in Figure 3e, can also be used to provide a fire-rated control joint and out-of-plane load transfer. Control joints (expansion and contraction) shall be installed in walls to delineate areas not more than 144 sq. Vertical control joints in stucco may be formed by plastering up to an angle, T-section, proprietary jointing bead or temporary batten or by cutting a V-groove through the lower plaster coats before they harden, then filling with sealant. ASTM C1063 requires that panel areas are no larger than 144 square feet. So, if you’re a contractor who would like to ensure that the codes do not continue to limit your ability to use tried and true methods, you might consider joining ASTM and weighing in while this and other issues are being resolved. Control or expansion joints are the Stucco industry’s solution for minimizing and controlling cracking in stucco wall systems. Expansion joint from stucco home to concrete wall. STAY-FORM® complies with Buy America and Buy American requirements. a. AWCI supports his position, says AWCI Executive Vice President & CEO Steve Etkin. Control Joints shall be Plastic Components, Inc. #_____. Many of the people making the decisions have never been a contractor, never have installed metal lath and lathing accessories and do not have on the job, real world experiences to rely on. Potential for bond can be quickly checked by a simple test: sprinkle the wall with some water to see how it absorbs. Stucco does not require expansion/contraction joints when directly applied to concrete, concrete block, or other masonry, except where there is a change from one material to another. Keywords: stucco, failures, restoration, water intrusion, moisture, insects, efflorescence, corrosion Filed Under: Videos Tagged With: control joints, Home repairs, installing control joints, kirk the stucco guy, lathing expert advice, rendering plaster tutorials, stucco control joints. What is the proper spacing for contraction/expansion joints in portland cement plaster/stucco applications? Consult a stucco representative for proper placing of control joints. Myth #3: Direct-applied stucco is easily packed out to meet a finished plane. Specifications. I believe it is in the best interest of the "entire" lath and plaster community, to allow regional practice, preference and personal experience to play an equal role in that of laboratory testing. These documents were generally developed by industry professionals, including contractors and bureau representatives that had spent their life in the lath and plaster business. STAY-FORM® is the most cost effective solution for forming bulkheads, tunnels or any below-grade structure. However, this particular issue has been the subject of debate for many years and, at the time of this writing, is up for discussion again among the keepers of ASTM C1063—and for good reason. Q: When installing control joints in a portland cement stucco system, is it necessary to cut the lath? Myth #2: Control joints are required every 13.5 m2 (144 sf). Solid plastering – Cement plasters for walls, ceilings and soffits. July 28, 2011 By Stucco Plastering Leave a Comment ft. on vertical surfaces and 100 sq. The advantage to this shape is that the down turning shoulder bites into the stucco and as a result the crack described in the last paragraph is less likely to occur or … Tuesday, December 10, 2019. Inspecting New Stucco and Lath Installations for Code Compliance The Truth About Florida Stucco Control Joints White Paper Drain Plane Vs. Face Barrier Systems Safe Attachment Tables for Metal Lath 35 Year Old Stucco System Over Wood Wall Performing Perfectly … The Double "J" shaped shoulders provide a more secure stucco bond. Can be used vertically to add an … A: According to ASTM C1063, Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster, the lath must be cut:  “7.10.1.5 Lath shall not be continuous through control joints but shall be stopped and tied at each side.”. Control joints in stucco. Sometimes high-rises go slightly out of plumb as they are constructed. One Piece Joints. So, to prioritize the topics taken up in these standards, the stucco work group recently asked its members for position papers recommending changes and the rationale for the suggested changes. Usually installed at a maximum of 144 square feet. 7.11.4 Control Joints-General —Control joints shall be formed by using a single prefabricated member or fabricated by installing casing beads back to back with a flexible barrier membrane behind the casing beads. Custom Web Design & Development, Foundation of the Wall and Ceiling Industry, Termination of AWCI Scheme of Arrangement. AWCI members' product information collection for 2021 More →, October 17 - 20 Requirements for reinforced stucco over a drained and vented cavity with a rigid or non-rigid backing are set out in NZS 4251.1:2007 . #15 Expanded Flange Control Joint (Double-V) is used to relieve stresses in large plastered areas of walls, ceilings, and stucco areas. They are also considered control joints and are one-piece joints. New Orleans, LA 4. A: According to ASTM C1063, Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster, the lath must be cut: “7.10.1.5 Lath shall not be continuous through control joints but shall be stopped and tied at each side.” ... stucco expansion joints are required where expansion joints occur in the building envelope substrate or movement is expected.) The key is paying attention to the types of cracks, and minimizing any significant issues that might lead to actual failure, including debonding, water intrusion, and mold problems. accessories such as expansion joints, control joints and corner beads; water intrusion where walls sit on solid structures such as concrete bond beams or slabs; corrosion of stucco accessories; and efflorescence at stucco accessories. Vinyl M-Type Control Joint Deep. Vertical joints should be attached to a stud where necessary. Control joints can also act as architectural embellishments delineating textur… Interstate Brick | 9780 South 5200 West, West Jordan, UT 84081 | (800) 233-8654. Comes pre-taped to ensure a clean finish. First, let’s look at some definitions: A control joint is a single prefabricated stucco accessory, applied to the surface of—or incorporated within—the metal lath to allow for the shrinkage of the stucco cladding typically associated with the curing or hydration process. These joints can be ordered without the removable tape. They both describe a combination of cement and aggregate mixed with a suitable amount of water to form a plastic mixture that will adhere to a surface and preserve the texture imposed on it. The distance between control joints shall The purpose of a stucco control joint is to relieve stresses on the stucco and reduce cracking and other damage caused by those stresses. ft. on horizontal surfaces. Control joints should be installed per stucco system manufacturer recommendations and per the specific system ICC-ES report with all components properly integrated. ASTM C1063 requires that panel areas are no larger than 144 square feet. The distance between control joints shall not exceed 18 feet, in either direction, or exceed length- to-width ratio of 2-1/2 to 1. b. If ASTM C1063 had been the agreed upon standard in a contract but was not adhered to during construction and the system failed, there was legal recourse available to the owner for not adhering to the terms of the contract. One AWCI member, Past President Mike Boyd, who is also the co-chairman of the task group for ASTM C1063 and the facilitator for AWCI’s Stucco—Doing It Right® program, has submitted a position paper on the issue of control joint installation. Contractor participation is rare. This modification will allow design professionals and contractors to include methods they know to work and avoid being penalized for not complying with the letter of the law.”. The "eyebrows" allow for the stucco to key to the "V". Q: When installing control joints in a portland cement stucco system, is it necessary to cut the lath? All exterior accessories shall be of PVC material conforming to ASTM standards D1784, C1063, C1861 and D4216. Hard-Coat Stucco Cracks, Leaks, Damage Stucco cracks, leaks at control joints, standards. But in 2006, ASTM C1063, among other standards, was cited by reference in the International Codes, which in turn meant that once adopted by a jurisdiction, unless otherwise amended, it became the law. Mark Fowler, vice president of the Western Wall and Ceiling Contractors Association, has also submitted a letter that shares Boyd’s position. Because of the thickness of the material, the substrate plays a bigger role in the movement of the wall. This is just such a small sample of the work being performed across America but, in my opinion, skews their thinking and their ability to understand the need for alternative means-and methods.”, Fowler offers his perspective: “I also prefer the control joint over continuous lath. Partial bond will create undesirable stresses and can lead to delamination and cracking of the stucco layer. Home > E-Media & Publications > AWCI's Construction Dimensions > Columns: Wachuwannano > Control Joints in Stucco. So, what was once offered as a “best practice,” which was one offering of many, became the lone practice to the exclusion of all others. Stucco control joints are used to help aid in preventing cracking in the stucco overtime. If it is readily absorbed, then the surface is expected to bond well with stucco. Accessories include control joints, expansion joints, corner bead, casing bead (plaster stop), cornerite, weep screed, etc. The proper use of contraction joints in stucco systems will depend on a number of variables, including: the type of construction materials to which the stucco will be applied; the orientation of the construction—vertical (walls) or horizontal (ceilings), and whether the surface is curved or angular. Lee G. Jones is AWCI’s director of technical services. Depending on the type of movement expected, the joint must be able to move in one direction or two by using some combination of materials, or by prefabricating the joints at the job site. Applications include stucco, thin stone, thin brick and masonry siding. In addition, the maximum spacing of control joints should be less than 18 ft. Attach Control Joint to the framing with nails, screws, or other approved fastening methods. In his paper, Boyd explains why the proposed change is necessary: “Up until 2006, reference documents prepared by industry associations/bureaus across the country carried the same weight as ASTM C1063. A control joint in stucco is intended to relieve stress and limit or control the cracking in the membrane of the stucco only. These joints can be … And as the members of the task groups that maintain the two standards are for the most part the same people, they have set up an informal group with the mission of ensuring that changes in one of the standards do not conflict with or leave omissions in the other standard. Niles Double "J" Expansion Control Joint Like the Double "V", the Double "J" is also used to provide a mechanism for movement to accommodate expansion and contraction caused by initial stucco shrinkage and minor thermal movement. ft. on horizontal surfaces. In truth, it is not abnormal to have some cracking with stucco, much of which can be relatively harmless. Control joints (expansion and contraction) shall be installed in walls to delineate areas not more than 144 sq. What do stucco control joints do? Hard-coat traditional stucco inspection, troubleshooting, repair & standards. False. There is controversy and confusion in our industry about their use and installation – particularly as to whether the lath should be continuous or discontinuous (cut) at the control joint. Requirements for reinforced stucco over a drained and vented cavity with a rigid or non-rigid backing are set out in NZS 4251.1:2007 Solid plastering – Cement plasters for walls, ceilings and soffits. Stucco control joints can either be one piece or two piece, and are used to help prevent the thin stucco plaster from cracking over time. The Double-V Control Joint counteracts the inherent shrinkage during stucco curing and general thermal changes. True. The aspect ratio of the panel should also be held to a maximum length to width ratio of 2 1/2 to 1. Fry Reglet Reveal Channel Screed provides an attractive break when used horizontally in a straight or curved long run of drywall. Many of the people that serve on the current ASTM C1063 committee because of the nature of their practice only see the failures or problem projects. In addition, the maximum spacing of control joints … Preventing Cracks in Stucco | 2014-05-01 | Walls & Ceilings ...http://www.wconline.com › articles › preventing-cracks. "J", "XJ" or "Griplock J" types of control joints with expanded flanges and the narrow wing control joint with the "J" type shoulder or nose are all grouped together because of the commonality of their shoulder shape. This Control Joint provides returns to better lock into the stucco. Install all Plaster Control Joints using full ten-foot lengths wherever possible. Many of these ‘bureau standards’ were developed for the sections of the country covered by the respective bureaus and were based upon many decades of successful installations on buildings and exterior wall configurations of all types. 3 HOW TO USE THIS GUIDE This guide focuses on the installation ... Stucco Level Coat: Used to smooth a wall’s surface in preparation for either primer, finish or coating and to embed mesh for ParexUSA Krak-Shield stucco … Control joints in stucco. We do not build in the lab, we build real buildings, and real life experience should count.”, And the conclusion of Etkin’s letter stating AWCI’s support for Boyd is this: “AWCI agrees that ASTM C1063 should be modified so that it allows and presents alternate methods for such things as installing control joints without cutting the lath. Stucco joints can also separate different textures, colors, or materials. more info →, © Copyright 2021 AWCI All rights reserved.Terms of Use | Privacy Policy, Site by BuildingOnline Things like changes in temperature, humidity, and even ground movement can all put stress on the stucco exterior and leave it vulnerable to cracking. When installing an expansion joint, the framing, sheathing and lath should be cut to create a true plane of expansion. Vinyl Control Joint with Removable Tape is an improved version of the “M” type expansion joint. more info →, February 25 This Control Joint provides returns to better lock into the stucco. Before specifying this joint construction, however, the availability of these unit shapes should be verified with local concrete masonry manufacturers. Crack control is placed at the spacings and detail as required for stucco. Myth #2: Control joints are required every 13.5 m 2 (144 sf). A control joint will not stop stucco from cracking if the stresses imposed upon the stucco membrane are greater than can be dissipated by the stucco and/or the control joint. Stucco Thickness: Splices Available: Stock Item: PCS 75-25-25: 3/4″ 1/4″ 1/4″ 7/8″ Yes: Yes . ft. on vertical surfaces and 100 sq.

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