In lieu of a bonding agent, a dash coat, roughing the surface, or metal lath are also acceptable methods for bonding. Astmc1063 historical revision information standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster astmc1063 2012a edition superseded show complete document history. Best practices for selection and installation of expanded metal lath. This lath sheet still requires furring on solid substrates. This question probably arises because plaster is often attached to wall. Astm c 979 standard specification for pigments for integrally colored concrete. Astm c106319a 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. Notably, these south florida systems were installed in one of the highest wind zones in. Astm c 1063, the installation specifi cation for metal lath used with portland cement stucco, provides specific data in table 3 that enables the designer to.
Provide appropriate type, configuration, and weight of metal lath selected from materials indicated that comply with referenced mlsfa specifications and astm lathing. Metal lath shall be tested and found to comply with the applicable requirements in astm c 847, with a minium g60 coating. Astm c847 18 standard specification for metal lath. C11 terminology relating to gypsum and related building materials and systems. Aug 27, 2019 standards astm c and astm c were carefully researched by. For recognition under the ubc, the weight shall also comply with the applicable. The eight deadly sins of expanded metal lath installation. Scratch coat 38 inch thick, brown coat 38 inch thick, and. Aug 10, 2019 standards astm c and astm c were carefully researched by. When installing control joints in a portland cement stucco system, is it necessary to cut the lath. The fasteners are attached into the groove and spaced at proper widths to achieve astm c 1063 installation standards. First lets deal with the proper lapping of metal lath.
Some of our experts feel that too large of a lap is as detrimental as too small of a lap. In addition, if the nails are to be trimmed flush and left in place, they need to be corrosion resistant as would be required for lath or other metal accessories, astm c 926 section 5. Astm c1063 14a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Astm c 1063 requires that expanded metal lath be lapped a minimum of 12 inch along the long dimension of the sheet and a. Zinc accessories, per astm b69, are produced from 99% zinc alloy and are recom. C1063, which establishes the requirements for stucco applied over a metal plaster base a. Expanded metal or woven wire lath shall be attached with 112inchlong 38 mm, 11 gage nails having a 716inch. Best practicesexpanded metal lath products 6 clarkdietrich. Physical properties such as thickness, width, length, and weight shall be specified. This standard does not replace astm c violation of the building code ibc and fbc referenced astm.
Astm c1063 standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Zinc accessories, per astm b69, are produced from 99% zinc alloy and. Scratch coat 38 inch thick, brown coat 38 inch thick, and finish coat 18 inch thick. Conventional stucco over wood should always be applied as a threecoat system. Metal lath shall be fabricated from hotdipped galvanized steel. Ubc provisions for portland cement plaster are contained in chapter 25 of that. This specification covers the installation of lathing and furring to receive interior and exterior portland cementbased plaster. Astmc1063 standard specification for installation of. Lath should only be used over solid bases as a last resort to achieving bond as described in section 5.
Scope 1 referenced documents 2 terminology 3 delivery and storage of materials 4 materials 5 requirements for substrates to. All clarkdietrich expanded metal lath is fabricated from prime galvanized steel, g60 zinc coating by the hot. Standard specification for installation of lathing and. Astms and code standards astm c847 astm a653 astm c841 installation only astm c1063 installation only icc esr1623 fed. A653a653m specification for steel sheet, zinccoated galvanized or zinciron alloycoated galvannealed by the hotdip process. Masonry surfaces to which a water repellent sealer has been applied 4. Stucco over expanded metal lath the most common errors and. According to astm c1063, standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster, the lath must be cut. Jul 18, 2019 standards astm c and astm c were carefully researched by. The ubc does not reference these two astm standards. Astm c 1063, standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Astm c1063 standard specification for installation of lathing and furring to. Questioning the stucco lath fastening requirements of astm c1063.
Always consult your area building official before beginning any project. All expanded metal lath accessories are fabricated from prime galvanized steel g60 zinc coating by the hot dipped method, conforming to steel and coating specification astm a 653a653m or zinc alloy meeting astm b69 as required in astm c1063 and c847. Stucco installation standards portland cement association. 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. People often ask us if stucco, or portland cement plaster, will adhere to concrete or concrete masonry. 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 c106399 standard specification for installation of lathing and furring to receive interior and exterior portland cementbased. Alternatively, self furring lath may be used, please contact the.
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. 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. Installation of lathing and furring to receive interior and exterior. Astm c 84709 specification for metal lath pdf download. Best practices for selection and installation of expanded. Safe attachment tables for metal lath to plywood, osb and. C, which establishes the requirements for stucco applied over a metal plaster base a. Oct 16, 2019 standards astm c and astm c were carefully researched by.
Sep, 2019 standards astm c and astm c were carefully researched by. Reference astm c926 application of portland cement based plaster. C926 specification for application of portland cementbased plaster. Astm c 1063 standard specification for installation of lathing and furring to receive interior and exterior. Designer choices and responsibilities in astm c1063 and astm. Lathing and furring accessory and fastener installation requirements remain in c as well. Astm c1063 19a standard specification for installation of lathing. All galvanized products produced from g60 pregalvanized steel coil, per astm c 847.
Reference astm c 926 application of portland cement based plaster. Standard specification for installation of lathing. Where metal or nonmetallic plaster base is used in areas where bond cannot be obtained by one or more of the methods in 6. Astm c 629 standard specification for slate dimension stone. Astm c1861 lathing and furring accessories and fasteners, for interior and exterior portland cementbased plaster. Standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster. Weight shall also comply with applicable requirements in table 3 of astm c 1063 for the support spacings indicated. Designer choices and responsibilities in astm c1063 and. Sep 29, 2019 standards astm c and astm c were carefully researched by. Best practicesexpanded metal lath products 6 picture showing lath applied to the wall with vgroove selffurring and weather resistant barrier behind the lath. Metal lath specification sheet expanded diamond metal lath. Astm c1063 standard specification for installation of. Astm c1063 installation of metal plaster base systems. Astm c1063 08 standard specification for installation of.
For complete requirements for fasteners see astm c 1063. Weathered wood sheathing and sidings lath the lath shall be minimum either 3. Astm c106316a, standard speciication for installation of lathing and furr ing to receive interior and exterior portland. Astm c1780 installation of adhered manufactured stone veneer. How to install metal lath these installation recommendations are intended to be instructional and accurate. C 847 metal lath properties, c 841 interior metal lath and trims for stucco, c 1063 application of metal lath and accessories. Plaster plaster stucco manualortland cement portland. Expanded metal or woven wire lath shall be attached with 112inchlong 38 mm, 11 gage nails having a 716inch 11. Comply with astm c 847 for material, type, configuration, and other characteristics indicated below. Fabricate expandedmetal lath from sheet metal conforming to the following.
Metal lath and lathing accessories as a base to receive portland cement plastering is almost solely used for stucco wall cladding systems placed over a water. C106319a standard specification for installation of lathing and furring to receive interior and exterior portland cementbased plaster metal laths walls fire resistance rating installation furring metal. Standards astm c and astm c were carefully researched by. Install metal lath for the following applications where plaster base coats are required. Backing shall not be placed between plaster base lath and flanges of accessories, metal lath to metal flange contact required 7. Not flat lathe 59 furred lath allows plaster to encase wire 60. Lath and lath attachments shall be of corrosionresistant materials.
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