Questioning the stucco lath fastening requirements of astm. Verify that the substrate to apply the metal lath framing is free of gaps, protrusions. Best practices for selection and installation of expanded. Astm c926stucco control joints industry standardchanges from the previous issuea redline edition is available for this document, with all changes visible. Scratch coat 38 inch thick, brown coat 38 inch thick, and finish coat 18 inch thick. Best practicesexpanded metal lath products 6 picture showing lath applied to the wall with vgroove selffurring and weather resistant barrier behind the lath.
C926 specification for application of portland cementbased plaster. Astm c 841, diamond mesh selffurring diamond mesh flat rib 10 mm38. This is first a guideline, providing a general overview and also equips the new steel lather with specific installation details, based on astm c 1063 99 standard specification for installation of metal lath. Conventional stucco over wood should always be applied as a threecoat system. Scope 1 referenced documents 2 terminology 3 delivery and storage of materials 4 materials 5 requirements for substrates to. Astm c106319a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. N ote 3all metal, or pvc, or cpvc plastic members should be free of deleterious amounts of rust, oil, or other foreign matter, which could cause bond failure or unsightly discoloration. Stucco over expanded metal lath the most common errors and. Astm c1063 18a standard specification for installation. Accessories shall be free of deleterious amounts of rust, oil.
Galvanized steel rib lath for sale, find complete details about galvanized steel rib lath for sale,astm c 1063,vinyl lath,galvanized lath from metal building materials supplier or manufacturerhebei fulangsi metal wire mesh product co. Standard specification for installation of lathing. Install the control joint over continuous lath, which has proven to work but violates astm c 1063. Astm c1063 11a standard specification for installation of. Recommended installation of control joints structa wire. Mar 06, 2008 install the control joint over continuous lath, which has proven to work but violates astm c 1063. The 2016a versions of c1063 and c926 are referenced for this paper as the most current versions, though they are not yet codiied. Astm c 1063, standard specification for installation of lathing and furring to receive.
Astmc1063 standard specification for installation of. C, which establishes the requirements for stucco applied over a metal plaster base a. This standard does not replace astm c violation of the building code ibc and fbc referenced astm. Metal lath shall be fabricated from coldrolled carbon steel sheet of commercial quality as specified and galvanized metal lath shall have a g60 coating. Astm c 1063 requires that expanded metal lath be lapped a minimum of 12 inch along the long dimension of the sheet and a. See your ad here related searches astm c 926 and astm c 1063 astm c 926.
Backing shall not be placed between plaster base lath and flanges of accessories, metal lath to metal flange contact required 7. This question probably arises because plaster is often attached to wall. C11 terminology relating to gypsum and related building materials and systems. Not flat lathe 59 furred lath allows plaster to encase wire 60. Lath manufacturers have to replace this furring tooling to maintain the 14 inch. All clarkdietrich expanded metal lath is fabricated from prime galvanized steel, g60 zinc coating by the hot. Lath should only be used over solid bases as a last resort to achieving bond as described in section 5. As soon as the transaction is completed, your astm standards subscription will be ready for access. This specification covers the installation of lathing and furring to receive interior and exterior portland cementbased plaster. Standards astm c1063 and astm c926 were carefully researched by two design profes sionals who.
Designer choices and responsibilities in astm c1063 and astm. Astm c1063 does not, however, explain that to do so, you must have backing at either side of the vertical joint to properly secure the discontinuous ends of the lath and the. Astm c1063 14a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. No comments were found for astm c1063 11a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. If the language in astm could be changed to allow the option of continuous lath behind the vertical control joint or add language that requires the proper framing support not the plastering contractors responsibility would be very helpful. Rib lath support spacing for metal lath adapted from astm c1063, table 3 types of lath nominal weight vertical spacing inches horizontal inches 1per sq. Other alternative laths, like pure zinc alloy a softer metal versus galvanized steel and nonmetallic scrims, are being advertised as acceptable laths for stucco and stone as well. Astm c1063 standard specification for installation of lathing and furring to. For complete requirements for fasteners see astm c 1063. Designer choices and responsibilities in astm c1063 and.
Standards astm c and astm c were carefully researched by. Black metal nongalvanized lath may be used on the interior applications. Lath should only be used over solid bases as a last resort to achieving bond. Metal lath is regularly used over stud wall construction with or without. The selffurring welded wire lath is an alternative to the 3. Installation of lathing and furring to receive interior and exterior.
Verify that the substrate to apply the metal lath framing is free of. Reference astm c926 application of portland cement based plaster. Hangers and coldrolled channel main runner shall conform to. Astm c1063 11a standard specification for installation. Download citation questioning the stucco lath fastening requirements of astm c1063 brett d. Physical properties such as thickness, width, length, and weight shall be specified. Stucco installation standards portland cement association. Zinc accessories, per astm b69, are produced from 99% zinc alloy and. Best practices for selection and installation of expanded metal lath. These requirements do not by default define a unit of work or assign responsibility for contractual purposes, which is the purview of a contract or contracts made between contracting entities. Examples might include a projectspecific requirement for stainless steel lath, lath. Astm c1063 installation of metal plaster base systems. Astm c 1063, standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Astm c106399 standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster superseded see active link, below.
Lathing and furring accessory and fastener installation requirements remain in c as well. Astm c106303 standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster superseded see active link, below. This document is available in either paper or pdf format. First lets deal with the proper lapping of metal lath. Both standards incorporate material standard speciications by referencing other astm standards, such as astm c150 for portland cement or astm c847 for metal lath. How to install metal lath these installation recommendations are intended to be instructional and accurate. Metal lath shall be fabricated from hotdipped galvanized steel. C847 metal lath properties, c841 interior metal lath and trims for stucco, c 1063 application of metal lath and accessories. Standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster this specification covers the minimum requirements for lathing and furring for the application of exterior and interior portland cementbased plaster as in specification c 926 or specification c 841. Astm c1063 standard specification for installation of. Astm c1063 19a standard specification for installation.
Zinc accessories, per astm b69, are produced from 99% zinc alloy and are recom. Appropriately, the measure of an expanded metal lath products quality begins during the manufacturing process. The lath is produced from coldrolled rectangular longitudinal wires with coated thickness of 0. Astm c 1063 standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster plaster and stucco accessories. Standard specification for application of portland cement. People often ask us if stucco, or portland cement plaster, will adhere to concrete or concrete masonry. Mortar this document comes with our free notification service, good for the life of the document. All galvanized products produced from g60 pregalvanized steel coil, per astm c847. Quite often, cement forms metal rib lath tunnel steel ribs flat and 38 is specified for use on framing that doesnt warrant its use. Some of our experts feel that too large of a lap is as detrimental as too small of a lap.
Naamm emla 92009 metal lathing and furring i how to use these specifications these specifications are a guide for the specification writer, inspector, and contractor concerned with the aspects of metal lathing and furring for plastered construction. To get an understanding of whats happening in the lath and plaster industry is largely. Astms and code standards astm c847 astm a653 astm c841 installation only astm c1063 installation only icc esr1623 fed. Gypsum to find similar documents by classification. Tilath, paperbacked metal lath to achieve 1 of the 2 layers of grade d paper. Over time, this wear can result in furring falling below the onequarter inch that is required in astm c 1063, table 3, footnote c.
This wear can manifest in furring falling below the 14 inch required in astm c 1063, table 3, footnote c. Lath shall not be continuous through control joints, but shall be stopped and tied at each side in summary structa wire corp. The astm c10631 compliant method for installing control joints is to do so prior to the lath installation, thereby providing discontinuous lath terminating into the joint. The fasteners are attached into the groove and spaced at proper widths to achieve astm c 1063 installation standards. Raw material coming into the machine in foreground and the cutters in the machine background. This standard is issued under the fixed designation c1063. A653a653m specification for steel sheet, zinccoated galvanized or zinciron alloycoated galvannealed by the hotdip process. Metal lath specification sheet expanded diamond metal lath. Astm c1861 lathing and furring accessories and fasteners, for interior and exterior portland cementbased plaster.
Related searches astm c 926 and astm c 1063 astm c 926. Standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. From table 3 of astm standard c 1063, expanded metal lath is approved for use on the underside of horizontal surfaces with framing supports spaced up to 16 on center. Alternate lath acceptable with a product evaluation acceptable report showing compliance to icc es ac 275. Metal lathing and furring 9 naamm emla 92009 december 2009 metal lathing and furring 9 naamm09 standard guide specifications for expanded metal lathing and furring. Astm c1780 installation of adhered manufactured stone veneer. Cement forms metal rib lath tunnel steel ribs buy cement. Your onestopshop for standards, including astm c 926. Astm c1063 19a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Galvanized steel rib lath for sale buy astm c 1063,vinyl. C847 metal lath and trims for interior and exterior. Astm c1063 08 standard specification for installation of.
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