July 28, 2011 by stucco plastering leave a comment. This is an aesthetic or control joint, not an expansion joint. The expansion joint ending in the window looks wrong. The control joints are required to form membrane panels no. Control joints are not intended to be a substitution for an expansion joint. Expansion joints must be placed at least every 100 sf and above door bucks as noted previously. V joint expansion joint, control joint for stucco, stucco control joint, stucco expansion joint, plastic stucco control joint, expansion joint, stucco joint, control joint for stucco. Control joints may also serve as expansion joints, if so specified and detailed. Joint spacing in stucco is more of an issue over frame construction. F control joints with removable tape designed to provide stress relief at the juncture of walls, ceilings, floor lines, or other dissimilar materials. Stucco 2piece expansion joint amico building products. Unlike control joints, expansion joints are left completely free of mortar.
A control joint shall be installed where the ceiling framing or furring changes direction. 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. The best caulking material for vertical masonry expansion. They are filled with an electrostatic sealant to keep them free from water. Surface connector clips are provided for alignment and base for sealants.
Control joints can also act as architectural embellishments delineating texture differences or color changes. Intersection of crosses, ts, ls, inside and outside corners and end closures are available. Its made of 26gauge steel and built to last in exterior applications. For additional information on double v expansion control joint, download a product specifications sheet. Types of concrete joints and placing tips the balance. Different from cjs, stucco expansion joints are required where. Control joint in concrete control joints in concrete are provided at regular interval to from a weak plane, so that cracks are formed at the joints but not in undesired places. When a control joint is formed, the metal lath abuts the termination flange and the stucco continues from the lath onto the flange. What is the difference between a control joint and an. One of the most common issues with stucco and eifs are cracks. As the premier provider of metal lath products to the construction industry, cemco offers expansion joints and expanded corner beads manufactured by niles building products, inc. What is the proper spacing for contraction expansion joints in portland cement plaster stucco applications.
Cracking can occur in both cladding systems but are more common in traditional stucco. Without the proper type of joints in concrete, it may crack in an unsightly or random manner, causing damage and. Expansion control joints to control the expansion and protect the wall structure from cracking under pressure, masons install vertical control joints at specific locations. Control joints are not intended to accommodate structural movement of the wall assembly. Traditional stucco or hard coat stucco is made up of several different components, one of those being the hard coat itself. Expansion joints or control joints installed on a stucco. Used to relieve expansion and contraction stresses vinyl 093 control joint vlcj formerly known as cjv16 or cvjt is applied between abutting gypsum panels and is used to relieve stresses of expansion and contraction of drywall in large ceiling and wall expanses over 30. Metal doublev expansion joint is hotdipped galvanized for durability and weather protection. A onepiece joint is typically classified as a control joint. Awesome plastering guru techniques, control joints, expansion joint images, installing control joints, remove repair replaster. Stucco expansion joint at window exteriors forum the inspectors. This bead is designed to deal with normal initial stucco shrinkage during the hydrating and curing stage of the portland cement stucco generally exterior or gypsum plaster interior coats and minor thermal.
Does the type of joint in plaster affect its spacing or location. This nearly inconspicuous expanded wing control joint minimizes cracking and assures proper plaster and stucco thickness. Removable tape protects deep v expansion slot during construction. J4 is provided courtesy of the northwest wall and ceilings bureaus stucco resource guide. Sfsp designs, and manufactures,quality building products. Sawcut joints should be done within 4 to 12 hours after the concrete has been finished. Movement control joints in plastered finishes building performance. Pb eifs overcame the stucco s intrinsic joint requirement and capitalized upon this benefit in promotion of these eifs to the architectural community. How to evaluate cracks at control joints or expansion joints. How to install a controlexpansion joint viewer request. Consult a stucco representative for proper placing of control joints. May 04, 2016 different from cjs, stucco expansion joints are required where expansion joints occur in the building envelope substrate or movement is expected.
What is the difference between a control joint and an expansion. In traditional stucco work, is there a distinction between control joint and expansion joint. No matter if the joint is called a control joint, a contraction joint, or an expansion joint, it is there to relieve stresses. Corner control joints with removable tape vinylcorp. Pvc control joint with embeddable flange design clarkdietrich eflange embeddable stucco profiles provide 80% more embedment than standard flat flange profiles. Posts about expansion joint written by exteriorrestorations. Stucco frequently asked questions portland cement association. Stucco crack reduction system optional refer to sma website for more information. V joint expansion joint, control joint for stucco, stucco co. Caulk all intersections, butt joints, ends and corners at. Due to factors beyond the control of the drywall doctor, we cannot guarantee against improper use or. Expansion joints, on the other hand, should be used wherever the joints need to control both expansion and contraction.
The improved shoulder design allows easier stucco embedment and increases holding capacity at the joint to minimize cracking. Metal lath expansion control joints vinyl stucco products. Removable tape has been provided to insure a clean joint after stucco. Hi reggie, each plaster coat shall be applied to an entire wall or ceiling panel without interruption to avoid cold joints and abrupt changes in the uniform appearance of succeeding coats.
Expansion joints were made for two reasonsone to control cracking due to expansion and one to. Onepiecetype, folded pair of unperforated screeds in configuration. Many homes were built without stucco expansion joints. This helps to reduce stucco separation at the edge of the joint. The proper use of contraction joints in stucco systems will depend on a number of variables, including. Kerf cuts can be made between the stucco and dissimilar materials, predominantly windows and doors. An expansion joint is a stucco accessory that accommodates. The recommendations for the installation of expansion joints or reveals is to break the lath and lap it over on top of each of the flanges. Cold joints in stucco stucco newsinfo on stucco and.
Control and or expansion joints where house meets garage. Amico vinyl 2piece expansion joint with 12 reveal is designed to relieve stresses in stucco wall and ceiling areas where a greater than normal degree of movement might occur. Eflange control joint clarkdietrich building systems. Horizontal expansion joint in three coat stucco installation moisture management detail. These expanded metal trims and expansion joints are produced from hotdipped galvanized steel that comply with astm c1063 and c841. Control joints will provide stress relief from minor movement, such as that associated with hydration during the first 21 days following the initial plaster application. What is the proper spacing for contractionexpansion joints in portland cement plasterstucco applications.
Control joints are provided in concrete pavements, slabs, walls, floors, dams, canal linings, bridge, retaining walls etc. An expansion joint in stucco is a twopiece slip joint that is installed at a similar expansion joint in the structure of building. Expansion joints are cuts in concrete slabs, or the joints between walls and concrete slabs, that go completely through the slab to the base material. Where stucco has been erroneously packed out without reinforcing, a fix may include pinning. We are committed to excellence in product development and customer service. Should be used in any application where a surface area is more than 144 square feet. When installing an expansion joint, the framing, sheathing and lath should be cut to create a true plane of expansion. These kinds of joints normally handle the contraction of the mortar mix and minor expansion and contraction. In many cases, these required joints are architecturally undesirable. Expansion joints versus control joints control joints cj are 1piece joints designed to relieve stress and minimize cracking. A control joint in stucco is intended to relieve stress and limit or control the cracking in. A control joint is used to reduce the occurrence of shrinkage in concrete, and it is usually a continuous, vertical joint filled with mortar. The foam and stucco expand and contract at different rates. In fact, pb eifs came to be promoted as a cladding which, unlike stucco, did not need joints.
An expansion joint is a continuous or horizontal joint. Difference between control and expansion joints concrete. That when applying portland cement plaster for wind or seismic shear. Intersections of joints may be buttedandcalked and the following. Recommended installation of control joints structa wire. A control joint provides a stopping point or a break in applying materials. It will work better if the foam does not bridge the control expansion joints. A control joint is a gap, usually formed in a straight line, placed at intervals to control where and how cracks will occur in poured concrete. These joints can be ordered without the removable tape. An expansion joint is a stucco accessory that accommodates movement beyond plaster shrinkage and curing, and minimal wall expansion and contraction. Stucco news question and answers on stucco and plastering july, 20 cold joints. Wherever dissimilar materials meet and every 100150 square feet, control joints should be used to separate the panels. Technical information product and systems technology.
When you see a crack or joint that is formed in a straight line, dividing poured concrete into sections, most likely its a control joint. What do control joints or expansion joints look like. Like control joints, expansion joints should be provided near corners in the masonry, near returns or changes in the planes of the masonry wall, at any significant changes in the walls height or stiffness, at changes in foundations and at regular intervals along the wall. Double v expansion control joint used to provide mechanism for movement to accommodate expansion and contraction caused by initial stucco shrinkage and minor thermal movement. Control joints, expansion joints and cold joints in. Also, control joints can be installed in a way that does not deter from the aesthetic appeal of the building.
Jun 16, 2019 maximum joint spacing should be 24 to 36 times the thickness of the slab. In stucco applications there are both expansion joints and control joints. These joints will absorb the pressure created by the expansion by giving the masonry wall flexible space to expand. In particular, horizontal expansion joints should usually be provided. Control joint may be installed in the field of panel only if there is a continous substrate behind it. Joints should be spaced about 10 feet and a maximum of 15 feet. Can i patch or plaster patch work on a stucco block wall. Where expansion or control joints occur in the base wall construction andor building structure see fig. Ez bead used as a control joint and or an expansion joint in stucco or other plaster veneers. This product provides excellent expansion control for both walls and ceilings like the amico expansion control joint, but offers positive locking of the stucco to the edge of the joint. Eflange allows for more stucco mix to flow through the flange, providing a more thorough and consistent embedment. Stucco expansion joints stucco repair stucco siding stucco. Jul 23, 2017 control joint expansion joint is so important at times watch and see.
The vast array of information about control joints can easily perplex and overwhelm, and the industry is replete with a variety of differing viewpoints and oftentimes conflicting. Fry reglet 2 piece plaster expansion joint archives fry. Stucco joints are commonly available as one piece or two piece joints. Difference between control joint and expansion joint. You cannot span over these with a control joint, a trowel cut in the stucco or any other. V joint expansion joint, control joint for stucco, stucco. Imperial gypsum base 2 control joint in l shaped ceiling. The finish coat is then applied over the sealant or the expansion joint. Find quality concrete expansion joints online or in store. This is a single component, nonsag, waterbased acrylic product is for use in vertical applications, such as concrete walls, brick walls, stucco walls, cement fiber board, concrete block and other masonry surfaces. Expansion joints were made for two reasonsone to control cracking due to expansion and one to provide a stopping point for the application of materials. This control joint provides returns to better lock into the stucco.
Stucco joints can also separate different textures, colors, or materials. How to evaluate cracks at control joints or expansion. Zinc control joint zinc control joint has a solid flange with large holes that aid in the attachment of adjoining metal lath. Control or expansion joints are the stucco industrys solution for minimizing and controlling cracking in stucco wall systems. E veryone interested in exterior stucco wall cladding systems has a perspective on control joints and those perspectives are not unilaterally held by all. Avoid cracked plaster by using stucco control joints. You see, concrete, a cement product, tends to crack in squares, so the. Expansion joints cannot be retrofit into existing stucco buildings, but some steps can be taken to help prevent this from developing into a serious and damaging situation. Directapplied stucco is easily packed out to meet a finished plane. The locations of movement control joints in the plaster finish vary. Google expansion or control joints, you can read forever as theres tons of information. Vinyl 093 control joint vlcj clarkdietrich building systems.
Put the foam just to the edge of the joints either topbottomleftright. Corner control joints with removable tape designed to relieve stress caused by expansion and contraction in wall and ceiling inside angles. 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. When using joint groove for contraction joints, the joint should be a minimum depth of. In the trade, these are known as accessory trim joints. Control or expansion joints for stucco walls, lathing quick tips.
The rules for the maximum spacing between joints and the maximum size of panel are well established and discussed in a separate faq on joint spacing. Stucco control joints are used to help aid in preventing cracking in the stucco overtime. Here are the best uses of stucco control joints for stucco, including one and. Finally, it states, a control joint shall be installed where an expansion joint occurs in the base exterior wall. When installed properly, they will help both cladding systems function correctly. Stucco manufacturers association guide specificationiton. Control joints are designed to control shrinkage or other cracking where relief of masonry expansion is not required. The unique eflange shape also allows for quick and easy tying of lath and other accessories. The purpose of an expansion joint is to allow the concrete slab to expand and contract with temperatures changes, without cracking the. If control joints are not provided, a concrete masonry wall may crack as it.
Shaped like a v or m, it is usually fabricated with expanded flanges to increase bonding characteristic. The distance between control joints shall not exceed 18 feet in either direction or a lengthtowidth ratio of 2 1. Crack control is placed at the spacings and detail as required for stucco. V joint expansion joint, control joint for stucco, stucco control joint, stucco expansion joint, plastic stucco control joint, expansion joint, stucco joint, control. Hiding stucco control joints nonstructuralintl bldg. Stucco frequently asked questions answered by experts. Expansion joints or control joints installed on a stucco homes. Control joints, expansion joints and cold joints in concrete. These joints are generally used in concrete masonry walls and stucco. Horizontal expansion joint in three coat stucco installation.
Vinyl control joint with removable tape is an improved version of the m type expansion joint. If you cover them over time it canwill create problems. Sep 21, 2017 many homes were built without stucco expansion joints. Incorporate control joints in accordance with astm c 1063 guidelines.
For this article, stucco refers to traditional portland cement plaster. The moisture barrier should be installed continuously behind the joint. Expansion joints were made for two reasonsone to control cracking due to expansion and one to provide a stopping. May 10, 2011 expansion joints or control joints installed on a stucco homes. An expansion joint is a continuous vertical or horizontal joint, left completely free of.
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