stucco control joint spacing fbc

In the past this has been ignored in single family residential construction, but apparently not anymore. Vinyl Control Joint with Removable Tape is an improved version of the “M” type expansion joint. Expansion Joint Control Joint Weep Screed Drainage Screed 0.0172-in All information contained herein is accurate as known at the time of publication. H��UKk�0��цXь4��Bi��K�ac� �RH��ɶ6/JY��㛷|��մ��&0`��.ǿh��l9��k��=?�,ϻ�s��;��f d�O�}g*h�. In stucco on lath, the ASTM 1063 code requires a control joint at a maximum spacing in walls of 18 ft o/c both horizontally and vertically enclosing an area no more than 144 sf. Much of the time, the depth that finishers install control joints is less than what is normally recommended. Support spacing for gypsum or metal lath on walls or ceilings shall not exceed 16 inches (406 mm) ... one control joint, ... At the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings. The FBC & ASTM C 1063 1. A control joint shall be installed where the ceiling framing or furring changes direction.” Finally, it states, “A control joint shall be installed where an expansion joint occurs in the base exterior wall. Stucco on lath-Control Joints ASTM C-1063 7.11.4.1 Control joints-Control joints shall be installed in walls to delineate areas not more than 144 sf2... Florida Building Code 7.11.4.2 The distance between control joints shall not exceed 18 ft … You can learn a lot from manufacturers instructions, but it is unlikely you would learn everything you need to know to perform a good inspection. NCMA TEK National Concrete Masonry Association an information series from the national authority on concrete masonry technology PLASTER AND STUCCO FOR CONCRETE MASONRYTEK 9-3A Mortar, Grout, Stucco (2002) Keywords: ASTM Specifications, coatings, construction techniques, plaster, stucco INTRODUCTION Portland cement-based plaster has … Spider cracks happen even within control panels. %%EOF You'd be amazed at what you can learn when you put your heads together on site. endstream endobj 38 0 obj <>stream The area enclosed by the control joints cannot have a length to width ratio greater than 2 ½ :1 . I'm curious as to how many here are enforcing the residential control joints in stucco? metal angles to create joint wall framing. Structa Wire Corp. per ASTM C 1063 – recommends that Control Joints be used to delineate stucco areas not greater than 144 sq. It takes full time continuing education to keep up; not, just the required few hours. �UVDJ�S$R�\��&� yE�u�e�tq9�p�e��i�q��p��+�O�+� �'�V The EOR indicated that he wanted the joint to be 2 hr fire rated. ��S��OZ��$L��t��Vt�Hfi/��I'x�h��vu��eDG�~/)�)�>M.w��w2/S��N�n�o�� :^�ҷK�|U�_^Bl��ˊ��h `� Have yet to see properly applied stucco.. (and people wonder why their stucco is cracking). The main problem is educating the inspectors. This Control Joint provides returns to better lock into the stucco. ... •3.2.1 control joint, a joint that accommodates movement of plaster shrinkage and curing ... Two Piece Expansion Joint Designed to relieve stresses in stucco wall and ceiling areas where a greater than normal degree of … 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. Space joints (in feet) no more than 2-3 times the slab thickness (in inches). Stucco can be applied over concrete and masonry surfaces and will only require joints where there is a change in material or over concrete joints. JavaScript is disabled. It may not display this or other websites correctly. max. It's not enough in todays world to know what is in the code books; because, so much of the building materials have specialized requirements and installation instructions that are not and cannot be specifically addressed in the code books. "Control joint spacing in masonry is usually between 20’ to 25’ on center. endstream endobj 39 0 obj <>stream Does the type of joint in plaster affect its spacing or location? Most don't know which way the cups go or even the nail pattern. Control Joint Spacing: The use and spacing of stucco control joints will depend on several factors: type of materials, type of surface and the orientation of the building. Spacing control joints Q: How frequently should control joints be spaced in unreinforced concrete masonry walls? ft., or at maximum distance of 18 feet between Control Joints. When a control joint is formed, the metal lath abuts the termination flange and the stucco continues from the lath onto the flange. 77 0 obj <>stream Figure 1a: Joint Spacing in Meters. I am happy to learn, but I don't see anything offered for training. It is important to provide sufficient control joints so that the movement occurs at the joint rather that midway between the control joints. Maximum on center spacing of framing members shall be no more t han 24 inches. Cut joints deep enough Cut joints 25% of the depth of the slab. The Double-V Control Joint counteracts the inherent shrinkage during stucco curing and general thermal changes. Carl is fine. }tO5 But the condition is that the lath be broken at the joint, that is the joint put on first and the lath run to the joint or a gap left in the lath behind the joint. We can't win; so we must adjust; and keep on learning. Have not seen our Stuccoman on here in a while. I�DReA#�TYTD>�P "�D��Y�g�S�ɳ#yW��6�h�xq��}��aU��U�o�M.�z�د D�� You can obtain guest membership to most of their technical literature if you are an inspector. For vertical control joints, there are a number of conditions that need to be considered. 59 0 obj <>/Filter/FlateDecode/ID[<264E594E27D57C75F0CD0D9932321710><934391CFA36C1C4882D4DDCE4C9453F6>]/Index[33 45]/Info 32 0 R/Length 118/Prev 202330/Root 34 0 R/Size 78/Type/XRef/W[1 3 1]>>stream No matter if the joint is called a control joint, a contraction joint, or an expansion joint, it is there to relieve stresses. endstream endobj startxref I never did, hell, it … They can cause problems as well. Joint spacing and location in stucco is dependent on whether the stucco is directly applied to the solid substrate or is placed onto lath which in turn is attached to the wall. Control Joints in Stucco. The codes are only as good or bad as the inspector in the field; assuming of course the Building Official is "allowed" to enforce the codes. h�b```f``�f`e``+gd@ A�(� Stucco can be applied over concrete and masonry surfaces and will only require joints over concrete or where there is a change in material. For walls containing masonry parapets, consider the parapet as part of the masonry wall below when determining the length to height ratio if it is structurally connected by masonry materials. Keep in mind; that Stucco may not be a "required inspection" in all jurisdictions. This allows the flange to move behind the stucco. When you ask them about keying in they look at you like you have three heads. endstream endobj 37 0 obj <>stream MORE JOINTING TIPS. The drainage plain is the most important factor. ǣx��{��10��NhWȡmA㐱�U�79!�$��ǫC(��Y��B/��y^��S��"�iPg�{w�� >��N�T�O�"�(L��v�4,Z��k�}!_�rM�dXj��DR��B control joints spaced every 25 ft (7.62 m). #XJ15 Expanded Flange Control Joint (Double-J) is used to relieve stresses in large plastered areas of walls, ceilings, and stucco areas. A 4" thick slab should have joints 1" deep. A control joint shall be installed where the ceiling framing or furring changes direction. One way is for several inspectors to go out on an inspection with with code books and/or installation instructions, in hand (like a lath inspection). A 4" slab should have joints 8-12 feet apart. I also spend time on construction sites; and the sad fact is that we need more knowledgeable inspectors and Building Officials than we will ever have. wall underlay 130 mm wide . Stucco Installation, Procedures and Guidelines The following document is based on the 2010 FBC, FBCR, ASTM C926, ASTM C1063, and other Application Guides regarding Stucco installation, procedures a… The distance between control joints shall not exceed 18 feet in either direction or a length-to-width ratio of 2 1⁄2 to 1. A: When no joint reinforcing is used, National Concrete Masonry Association (NCMA) TEK 53, "Design of Concrete Masonry for Crack Control," recommends spacing control joints in straight wall sections without openings no farther apart … Lath or wire mesh reinforcing must not be carried across stucco control joints. TIM & UB the problem goes deeper then that. backing rod and sealant. Maximum horizontal spacing of control joints in unreinforced concrete masonry walls should be approximately 32 feet, but a length (spacing) to height of wall ratio is a better measure. I hope all is alright. You are using an out of date browser. rigid backing flashing reinforcing first and . In this example, the maximum spacing of 25 ft (7.62 m) governs over the length to height ratio. �U&6�J��|�F��gA�f`f� Ҍ@��b̢�>#/@� ��;n Materials for the joint former include hot-dip galvanised steel, powder-coated hot-dip galvanised steel, stainless steel, powder-coated aluminium and uPVC. The separation spacing shall be not less than 1/8 inch or as required by anticipated thermal exposure range (per author and to accommodate stucco shrinkage).” It goes on to state that it has to conform to the previous section that states the following: “Lath shall not be continuous through control joints but shall be stopped and tied at each side.” The specification continues: “Control (expansion and contraction) joints shall be installed in walls to delineate areas not more than 144 square feet and to delineate areas not more than 100 square feet for all horizontal applications, that is, ceilings, curves, or angle type structures. The distance between control joints shall not exceed 18 feet in either direction or a length-to-width ratio of 2 1⁄2 to 1. We did not include this (Rubber, PVC CJ) in our contract, however, we did account for leaving the 3/8” of an inch as gap the control joint. indicate that water did not penetrate control joints in the exterior wall envelope, joints at the perimeter of open-ings or intersections of terminations with dissimilar materials. E4�=M8�C8��d � ��rAL@x��"��$+��. Just haven't had any stucco issues for him. A basic rule to follow when judging how deep a control joint should be is that it should be roughly 1/4 the depth of the concrete. �U�s��β�*�g�i��e��d��hp��&��ǲ�/OPt��.D# �b��фk4�)��Pa�� RDڨX��t�/�H� �c�"8/V6B�C:�U3N��>��#��J��EJ)��="[5`=8� N�:�iDA$��>�Àe �&A��D0�P"�P,��1��׭?M�c��@��x�j9ɧ� ۷��ܾ>��eN)��&l^��=x~}�n�5t��7��ƹ�df�o}�})��:��~"��"�v�n��-��2ۮ�YQV��\�M/��Ϥ��B�Z/�xS�ٴz.��>�#��s��1[��Ʀ�nٕ;~*p~�L�a��(�itc�{>�� ~!I�G�[�S�[�r�8p��g�[�W��>�:�|>�P��^�/��8�oq�%��`�}��,z��*��&�^�e�]�P��JF�� ^�aT�&��Xˍ�oϩ�;6��|��%� �k�߁�o�f05[�S�6�[��Z�I��7|�� z�>��Rr�R;| Lath weight ... but shall be stopped and fastened (wire tied) on each side of the control joint. Uncle Bob has always told us that the I Codes are supposed to be "stand-alone" codes, as I recall the ICBO saw fit in about 1968 to specifically call out weep screeds in the code, I have to wonder why they didn't specifically call out control joints at the same time instead of referencing ASTM 1063, since they go hand-in-hand? C1063 makes no differentiation between control and expansion joints—however, let’s consider control joints to be one-piece joints and all two- or three-piece joints, including back to back casing beads to be expansion joints. h�TR=o�0��7��`�(b��&��T�eȐ_�Gu ��{�t��ޚ؇��W�� Gc��Z7��j�X�ˊSo��&c�� Because it resembles poultry netting it is sometimes referred to by the street names of “Chicken Wire” or “Stucco Netting.” Over the years, it’s acceptance seems to have been relegated to installations of proprietary manufactured onecoat stucco products. rigid or non-rigid backing reinforced stucco. As has been pointed out before, for many of these contractors *we* are the educators. h�bbd```b``�� q�de��A$S XMXDLʀH��;0i&_�e��1`�3A�� 33 0 obj <> endobj And they will continue. CONTROL JOINT SPACING. second coats final plaster coat. As it is; the ICC added 198 pages to the 2009 IRC. You must log in or register to reply here. The drawings and any related notes or text contained thereon, are based upon typical requirements of LaHabra stucco assemblies and are published strictly as a guide for architectural and construction industry professionals to illustrate typical or general design conditions. NOTES: Removable tape has been provided to insure a clean joint after stucco application. Further – Structa Wire advises that the installation of control joints should fully comply with recommendations set forth in ASTM C 1063. ��cGpC��dV��QG�Ct$�D0x4��0Yd��8[�%�M�%�"Y��{�D�%B�m�Hi�ww7�]��{�U�V�gz��d�M�5HGU2�&��l�F�*]�M\s}t�;٪��u7_�)�Ϗ�Y�p�h�;ǪӴȖ�� True RJJ. Exterior walls, and the associated open-ings, shall be designed and constructed to resist safely the superimposed loads required by Chapter 16. For a better experience, please enable JavaScript in your browser before proceeding. Stucco on wood frame construction is another story, because stucco has a different rate of expansion/contraction than the underlying wood framing. The joints create brick panels which are independent of each other. Yes! Control joints only provide a place for cracks to stop or start. It is not just the code or inspectors that need education it is the contractors. "the I Codes are supposed to be "stand-alone" codes". NOBODY does this. Creating a sealant joint where the sealant is installed over a bond breaker or backing rod. Since this is controverisal here is a pretty good look at the controversy. Joint spacing in stucco is more of an issue over frame construction. Expanded flange control joint #15 Expanded Flange Control Joint (Double-V) is used to relieve stresses in large plastered areas of walls, ceilings, and stucco areas. N�#V��k"�4�"��y��I�� F./��kuVI��!G��0_V`�9L%b�� The following document is based on the 2010 FBC, FBCR, ASTM C926, ASTM C1063, and other Application Guides regarding Stucco installation, procedures and practices. 7.11.4.2 The distance between control joints shall not exceed 18 ft (5.5 m) in either direction or a length-to-width ratio of 21⁄2 to 1. Joint spacing that is greater than 15 feet require the use of load transfer devices (dowels or diamond plates). The use and spacing of stucco control joints depend on several factors: type of materials, the orientation of the building, and the type of surface. Welcome! In stucco on block What are the control joint spacing requirements for stucco on block? In the trade, these are known as accessory trim joints. I have been retired for two years now; and with all the spare time I have; still find it hard to keep up with all the new changes and product installation requirements. It is usually ordered by its dimension across its openings along with the gauge of the wire. CA: This is a big issue and the code still does not address it in a total format. This expanded wing control joint minimizes cracking and assures proper plaster and stucco thickness. May 2015 Q: When installing control joints in a portland cement stucco system, is it necessary to cut the lath? 1403.3 Structural. how many here are enforcing the residential control joints in stucco?". Vertical Control Joint Spacing The location of the control joints is based on where and why brickwork cracks. Plan out your control joint spacing … Control Joints: defined as a joint that accommodates movement of plaster shrinkage and curing along a predetermined line Panel size limit of 144 square feet (walls), 100 square feet (soffits) Max distance of 18 feet Max length to width ratio of 2.5 Where framing changes direction Expansion joints: defined as a joint that accommodates http://www.wconline.com/CDA/Archive/0d6db97b2b768010VgnVCM100000f932a8c0____, http://www.mnlath-plaster.com/library/documents/LathInspectionResourceManualUpdate2009.pdf, http://www.nwcb.org/publications.php?view=stucco. FBC Building 2510 and 2512 FBC Residential 703.6 and 704 ASTM C926-98a (2005) ... (too tight of spacing will effect stucco encapsulation) 7.10.2.2 Diamond-mesh expanded lath, flat-rib expanded lath, ... Do not caulk control joints Vertical control joint must be continuous through horizontal control joint The IRC would be 26 volumes; instead of 44 Chapters. How to cut joints Groover tools cut joints in fresh concrete. In an expansion joint, the lath overlaps the flange and the stucco is then applied over the lath. For example 1-inchby 20-gauge.¹. Stucco control joint – horizontal. h�TR�n�0��[t�,?� ��&2�&�.K�k��D7A��#�H��v��d�~RG\�V{��W��\�Բ��W�t��2/8��iX��/pw:��7��L)>�s8�-h4,۽H�*G�, o��D��{�8;��K�#4��-��&UgԷ��V-x�(DT� ��mB]0l�)gD�=��$�ܲ�su��ֱY��8��M�r�P�D�5 ASTM C1063 states, “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. I require control joints as needed. Woven Wire Lath (Illustration 4) is another product selectively used by the stucco industry. Generally, the industry uses the terms interchangeably. the International Residential Code was designed to be a "stand-alone" code. If a concrete slab is 4 inches thick, the depth of the control joint should be 1 inch. That is a 1/3 (33%) increase; and most jurisdictions will only address a few specific changes. %PDF-1.5 %�� Figure 4. cavity batten backing rod . and sealant 10–12 mm. These joints can be ordered without the removable tape. 2010 FBC, Sec. Now I know Stuccoman will be on this and we have talked at length regarding stucco issues. ��'��4t@��핷pUJ�m��9\�P�o*ǜ�d��p^�4#�FY��F� `` Q �`N�RD4$�b��b�0�8��r�:��1�c�c��t�i The industry has become so big that; with all the new products that are used; they find it neccessary to reference manufacturer's and other standards. Wall or partition height door frames shall be considered as control joints.”¹. h޼W[o�8�+~lU��_"U�Rz��5��HQRȡYAI�-�~g�@�m�C�*��|�0�G� �b$ Figure 1b: Joint Spacing in Feet Contraction joints may be tooled into the concrete surface at the time of placement. Stucco problems exists all accross this country. Here is good resource. I don't remember seeing many cracking problems in the old days; when they used chicken wire. " 7.11.4.3 An expansion joint shall be installed where an expansion joint occurs in the base exterior wall. All accessories must be installed to receive a minimum 7/8 inch application for a three-coat ... bond-break, lath, and stucco. Expanded flange control joint with a taped reveal for a clean finish. >�7>1/٠O\��v��O�|�C� ��.jǓ��C�9P�V��%��#�5n�G�~GX��P�xG��h,��:�Y��@W/��鿄�)J��;D}Z:A|��E��=� ��? First, vertical cracks may occur at the corners. 0;H2V^��@$�a�DDr� ��w��.� �e`�!�� h While this measurement (and other spacing restrictions from ASTM C1063, Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-based Plaster) are a requirement for stucco on lath, control joints (CJs) are not generally needed in direct-applied except for where the substrate changes. Our walls are 8” CMU with a 2 hour fire rating. A control joint shall be installed where the ceiling framing or furring changes direction.” Finally, it states, “A control joint shall be installed where an expansion joint occurs in the base exterior wall. However, I too wish the ICC would provide the standards they reference. Control Joints are not intended to stop cracking but rather control cracking; It is best to cut joints as early as possible either while finishing with a concrete groover or within 6-18 hours after finishing with a concrete saw. endstream endobj 34 0 obj <> endobj 35 0 obj <> endobj 36 0 obj <>stream (who makes the metal joints), that say for cement stucco you need a joint 18 feet O.C. The International Building Code and most model building codes reference ASTM C1063, the Standard Specification for the Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster, as the lath installation specification. By the way; in-house training is good for CEUs; or at least it used to be. 0 Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness.

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