ASTM_C_933_-_14.pdf

Designation:C93314Standard Specification forWelded Wire Lath1This standard is issued under the fixed designation C933;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers welded wire lath,flat orself-furring,with or without backing,designed for use as a baseto receive portland cement-based interior plaster and exteriorstucco.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A641/A641M Specification for ZincCoated(Galvanized)Carbon Steel WireC11 Terminology Relating to Gypsum and Related BuildingMaterials and Systems2.2 Federal Specifications:UU-B-790 BuildingPaper,VegetableFiber:(Kraft,Waterproofed,Water Repellent and Fire Resistant)33.Terminology3.1 Definitions of terms used in this standard shall be inaccordance with Terminology C11.4.Materials and Manufacture4.1 Welded wire lath shall be fabricated from not less than0.0625 in.(1.588 mm),cold-drawn,galvanized steel wire,conforming to Specification A641/A641M.4.1.1 Diameter tolerance for galvanized wire shall be inaccordance with Specification A641/A641M.4.1.2 The wire shall be zinc-coated(galvanized)in accor-dance with Specification A641/A641M.4.1.3 The backing shall conform to Federal SpecificationUU-B-790.The backing shall be either absorptive or waterresistant.The backing shall have a bursting strength of not lessthan that required to maintain integrity under normal hand-ormachine-application pressures.4.1.4 The backing shall be attached to the lath to preventaccidental removal during shipping,handling or installation.Attachment of the backing shall allow lapping of wire-to-wireand backing-to-backing of not less than one mesh at ends andedges and shall permit full embedment,in not less than14in.(6 mm)of plaster,of not less than one-half of the total lengthand width of the wire.4.1.5 The thickness of the embedment of the lath and plastershall be measured from the back plane of the back wire,exclusive of furring,to the backing or surface of the substrate.5.Dimensions and Permissible Variations5.1 Openings and Stiffening:5.1.1 Lath shall be welded at all intersections of wire toform openings not more than 2 in.(51 mm)by 2 in.(51 mm).5.1.2 Reinforced lath shall be permitted to be reinforcedcontinuously and parallel to the long dimension of the lath atintervals of not more than 6 in.(150 mm).Wires used for thispurpose shall range from 0.072 in.(1.9 mm)to 0.1205 in.(3.1 mm).Reduction of the size of the openings to less than2 in.(51 mm)by 2 in.(51 mm)shall also be permitted.5.1.3 Self-furring crimps on self-furring lath shall projectnot less than14in.(6 mm)from the plane of the back of thelath.5.2 ThicknessThe nominal thickness shall be18in.(3.2 mm),exclusive of self-furring crimps,with a permissiblevariation of 6132in.(0.8 mm).5.3 WidthThe nominal width shall be 28 in.(700 mm)to54 in.(1370 mm),with a permissible variation of 634in.(19 mm).5.4 LengthThe minimum length shall be 48 in.(1200 mm)for sheets or a maximum of 150 ft(45.720 m)for rolls with apermissible variation of 634in.(19 mm)for sheets or rolls.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved Aug.15,2014.Published October 2014.Originallyapproved in 1980.Last previous edition approved in 2013 as C933 13.DOI:10.1520/C0933-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.5 WeightThe weight,exclusive of backing,shall be aminimum of 1.14 lb/yd2(0.618 kg/m2).The weight of rein-forced lath,exclusive of backing,shall be a minimum of1.95 lbyd2(1.058 kg/m2).6.Sampling6.1 When specified by the purchase agreement,samples ofwelded wire lath shall be taken at the place of manufacture orat the place of destination.If samples are taken at thedestination,such samples shall be taken within 24 h of thereceipt of the material.6.2 At least 0.25%of the number of sheets of welded wirelath in a shipment,but not less than three sheets,shall be sosele