ASTM_F_2678_-_16.pdf

Designation:F267816Standard Practice forPreparing Panel Underlayments,Thick Poured GypsumConcrete Underlayments,Thick Poured Lightweight CellularConcrete Underlayments,and Concrete Subfloors withUnderlayment Patching Compounds to Receive ResilientFlooring1This standard is issued under the fixed designation F2678;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.Scope1.1 This practice includes recommendations for preparingand smoothing panel underlayments,gypsum concrete andconcrete subfloors with patching compounds upon whichresilient flooring may be installed.1.2 This practice does not cover the adequacy of thesubfloor assembly to perform its structural requirements,whichis governed by local building codes.1.3 This practice does not supersede in any manner theresilient flooring,underlayment or adhesive manufacturerswritten instructions.Consult the individual resilient flooring,underlayment or adhesive manufacturer for specific recom-mendations.1.4 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.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum ConcreteF141 Terminology Relating to Resilient Floor CoveringsF710 Practice for Preparing Concrete Floors to ReceiveResilient FlooringF1482 Practice for Installation and Preparation of PanelType Underlayments to Receive Resilient FlooringF2419 Practice for Installation of Thick Poured GypsumConcrete Underlayments and Preparation of the Surface toReceive Resilient FlooringF2471 Practice for Installation of Thick Poured LightweightCellular Concrete Underlayments and Preparation of theSurface to Receive Resilient Flooring3.Terminology3.1 Definitions used in this practice shall be in accordancewith Terminology F141.4.Significance and Use4.1 This practice provides minimum recommendations forpreparing and smoothing panel underlayments,thick pouredgypsum concrete underlayments,thick poured lightweightcellular concrete underlayments and concrete subfloors withpatching compounds.Actual requirements for materials to beused,mixtures,and other details are generally included as partof the project plans or specification details and may vary fromthe minimum recommendations set forth in this practice.5.Product Requirements5.1 The patching compound shall be able to be applied fromfeatheredge up to the manufacturers specified thickness overlarge areas.5.2 The patching compound may require the addition of anadditive other than water.5.3 The patching compound shall be able to be covered byresilient floorings as soon as the patching hardens and driessufficiently.1This practice is under the jurisdiction of ASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.40 onPractices.Current edition approved Feb.15,2016.Published March 2016.Originallyapproved in 2010.Last previous edition approved in 2010 as F2678-10.DOI:10.1520/F267816.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.4 The dried patching compound shall be moisture-free,mildew-resistant and alkali-resistant.5.5 For commercial installations,the patching compoundshall develop a minimum of 3000 psi compressive strengthafter 28 days when tested in accordance with Test MethodC109/C109M(air-cured only)or with Test Methods C472.6.Material Acceptance6.1 All patching compounds shall be delivered in theiroriginal,factory packaging.7.Material Storage,Conditioning and Protection7.1 All patching compounds shall be kept dry in a tempera-ture controlled environment on site and protected from theweather at least 48 h prior to use.The temperature shall not bebelow 65F(18C)or above 100F(38C).Refer to thepatching compound manufacturers recommendation for morespecific instruction.7.2 All patching compounds shall be kept off the ground andaway from damp and cold surfaces.7.3 Protect the applied patching compound from excessiveheat and drafty conditions while curing.