1、Designation: F2419 11Standard Practice forInstallation of Thick Poured Gypsum ConcreteUnderlayments and Preparation of the Surface to ReceiveResilient Flooring1This standard is issued under the fixed designation F2419; the number immediately following the designation indicates the year oforiginal ad
2、option 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 covers the installation and preparation ofthe thick pour
3、ed gypsum concrete underlayments over woodstructural panel subfloors in commercial structures or overconcrete floors in commercial structures and the preparation ofthe thick poured gypsum concrete underlayment surface priorto the installation of resilient flooring in commercial buildings.1.2 This pr
4、actice covers the factors that are required to becontrolled while installing thick poured gypsum concreteunderlayment as a base for resilient flooring.1.3 This practice does not cover the structural adequacy ofthe wood structural panel subfloor or concrete subfloor. Thestructural integrity of assemb
5、lies is governed by local buildingcodes.1.4 This practice does not supersede in any manner the thickpoured gypsum concrete underlayment manufacturers, adhe-sive manufacturers or resilient flooring manufacturers writteninstructions. Consult the individual manufacturer for specificrecommendations.1.5
6、Thick poured gypsum concrete underlayments are notsuitable for use on concrete slabs on ground due to potentialmoisture problems arising from moisture intrusion, unless anadequate vapor retarder or vapor barrier is present directlybeneath the concrete subfloor.1.6 The values stated in inch-pound uni
7、ts are to be regardedas standard. The values stated in parentheses are approximatemathematical conversions to SI units, which are provided forinformation only.1.7 This practice may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety con
8、cerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C472 Test Methods for Physical Testing o
9、f Gypsum, Gyp-sum Plasters and Gypsum ConcreteD4263 Test Method for Indicating Moisture in Concrete bythe Plastic Sheet MethodF141 Terminology Relating to Resilient Floor CoveringsF1482 Practice for Installation and Preparation of PanelType Underlayments to Receive Resilient Flooring3. Terminology3.
10、1 DefinitionsDefinitions used in this practice shall be inaccordance with Terminology F141.3.2 Definitions of Terms Specific to This Standard:3.2.1 fully adhered flooring, nresilient flooring which hasadhesive under the entire product, bonding it to the underlay-ment surface. F14823.2.2 non-fully ad
11、hered flooring, nresilient flooring thatmay be loose laid, in which no adhesive is utilized, or partiallybonded to the surface of the underlayment, typically at seamsand the surrounding perimeter of the product. F14823.2.3 subfloor, nthat wood or concrete structural layerintended to provide support
12、for design loads which may receiveresilient floor coverings directly if the surface is appropriate orindirectly via an underlayment if its surface is not suitable or ifunderlayment is required by appropriate code authorities.3.2.4 gypsum concrete underlayment, nthat layer of ma-terial, with binder c
13、ontent composed primarily of gypsumcement and Portland cement that is mixed with sand and water,then pumped and poured in a liquid state to be installed on orover a subfloor to provide a monolithic surface suitable toreceive resilient floor coverings.3.2.5 thick poured gypsum concrete underlayment,n
14、products which are installed in a liquid state over astructurally sound concrete or precast subfloor at a minimum of12 in. (13 mm) or a structurally sound wood subfloor at a1This practice is under the jurisdiction of ASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of
15、Subcommittee F06.40 onPractices.Current edition approved June 15, 2011. Published July 2011. Originallyapproved in 2005. Last previous edition approved in 2005 as F2419-05. DOI:10.1520/F2419-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
16、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.minimum of34 in. (19 mm) which when dry form an inte
17、gralpart of the floor ceiling assembly for fire resistance and soundratings, satisfy building codes for thick poured gypsum con-crete underlayments, and provide a suitable floor surface forthe installation of resilient floor coverings.3.2.6 sound mat, na membrane installed between a struc-turally so
18、und subfloor and a thick poured gypsum concreteunderlayment to increase sound reduction in the floor ceilingassembly.4. Significance and Use4.1 This practice provides minimum recommendations forthe installation of thick poured gypsum concrete floor under-layments suitable to receive resilient floor
19、coverings. Thispractice establishes the proper preparation, installation andquality control for thick poured gypsum concrete floor under-layments.4.2 Actual requirements for thick poured gypsum concreteunderlayments are generally included as part of project plans orspecifications and may vary from t
20、he recommendations setforth in this practice. Project plans or specifications, or both,shall supersede the recommendations set forth in this practice.5. Product Requirements5.1 For the purposes of this practice, thick poured gypsumconcrete underlayment shall be compounds consisting primar-ily of a m
21、ixture of gypsum cement, Portland cement and sand.5.2 When tested in accordance with Test Methods C472,thick poured gypsum concrete underlayment shall have aminimum compressive strength of 2000 psi (13.8 MPa) for useover wood subfloor and 3000 psi (20.7 MPa) for use overconcrete subfloors.5.3 When t
22、ested in accordance with Test Methods C472, thedensity shall be a minimum of 105 pcf (1680 kg/m3).6. Storage and Handling of Thick Poured GypsumConcrete Underlayments6.1 Thick poured gypsum concrete underlayments includedin this practice are typically delivered to the jobsites as drypowder in bags o
23、n pallets. Product shall be delivered inoriginal, unopened, undamaged bags with identification labelsintact. Bags and the enclosed material should not be damagedand should be protected from the elements after delivery to thejobsite. To avoid damage, bring raw materials to the jobsite justprior to th
24、e time it will be needed.37. General Guidelines7.1 Recommended thickness of thick poured gypsum con-crete over structurally sound wood is34 in. (19 mm) minimum.Recommended minimum thickness over structurally soundconcrete or precast concrete is12 in. (13 mm). Minimumthickness over a floor ceiling as
25、sembly which contains a soundmat shall be 1 in. (25 mm). Subfloor must support design loadswith maximum L360 deflection.7.2 Wood and concrete subfloors shall be structurally sound,clean and dry so as to support both the design live and deadloads in compliance with the local building code and theresi
26、lient flooring manufacturers installation requirements.7.3 The finished surfaces of the wood or concrete subfloorshall be properly prepared, clean, dry, smooth, and free ofconstruction wastes such as acoustic and wall texture, over-spray, dirt, solvents, oil, grease, residual construction adhe-sives
27、, adhesive removers, and other foreign materials.3Con-crete subfloors shall be fully cured and 28 days or older.7.4 Before, during and after installation of thick pouredgypsum concrete underlayment, the general contractor shall beresponsible for ensuring that the building shall be ventilatedand heat
28、ed to a minimum of 50F (10C) until subfloor andambient temperatures have stabilized. Temperature during andafter installation shall be maintained until material has com-pletely cured. The general contractor shall provide heat andventilation as necessary to dry the thick poured gypsumconcrete underla
29、yment.37.5 Installation of thick poured gypsum concrete underlay-ment shall not begin until the building is enclosed, includingroof, windows, doors and other openings. The general contrac-tor shall be responsible to provide continuous ventilation untilthe underlayment is dry. Thick poured gypsum con
30、creteunderlayment can be installed before or after the installation ofdrywall depending on the compressive strength specified andany sound control system requirements (see manufacturersrecommendations). Ceilings shall be sprayed or stippled toavoid overspray.37.6 Before installation of thick poured
31、gypsum concreteunderlayment, the condition of the structural subfloor and anyrequired elevations shall be inspected and approved by thegeneral contractor or owner, or both. All required flooring andnailing inspections shall be completed.37.7 Thick poured gypsum concrete underlayment installa-tion sh
32、all be by an applicator recommended to do this type ofinstallation by the manufacturer, experienced in performing thework of this practice, who has been trained in installation ofwork similar to the project under construction.8. Preparation of Subfloor8.1 The subfloor shall be of wood structural pan
33、el construc-tion or concrete, dry, level, securely nailed in the case ofpanels, and clean, without projections. Loose boards or panelsshall be renailed or screwed. Damaged, delaminated, badlycupped or warped board subfloors shall be replaced beforeinstallation of underlayment. Concrete subfloors sha
34、ll be 28days or older.8.2 All cracks and voids shall be covered or filled with aquick-setting taping compound or crack filler to preventleakage.9. Installation of Underlayment9.1 To minimize damage caused by other trades, the proce-dures in Section 11 shall be followed.9.2 Subfloor shall be prepared
35、 and primed, following manu-facturers recommendations using a manufacturers approvedprimer, prior to installation of thick poured gypsum concreteunderlayment.3International Conference of Building Officials, a subsidiary of the InternationalConference of Building Officials, Evaluation Report No. ER-4
36、147 and EvaluationReport No. ER-3433.F2419 1129.3 Bags of dry gypsum concrete underlayment shall bemixed in accordance with manufacturers recommendations inmanufacturers approved mixing and pumping equipment.9.4 Thick poured gypsum concrete underlayment shall bepoured or pumped onto subfloor at spec
37、ified thickness andspread and screed to a smooth surface. Thick poured gypsumconcrete underlayment shall be placed as continuously aspossible until installation is complete so that no thick pouredgypsum concrete underlayment is placed against thick pouredgypsum concrete underlayment that has obtaine
38、d its initial set,except at authorized joints.310. Field Quality Control10.1 Thick poured gypsum concrete underlayment shall betested for slump as it is being installed usinga2by4in.(51by 102 mm) cylinder. The patty size shall be as recommendedby the manufacturer of the thick poured gypsum concreteu
39、nderlayment.10.2 Field cube samples of thick poured gypsum concreteunderlayments shall be taken using split brass molds and testedin accordance with Test Methods C472. Manufacturer shallrecommend how often sample cubes shall be taken.11. Protection11.1 Because satisfactory performance of the finish
40、flooringdepends in part on the condition of the surface of the thickpoured gypsum concrete underlayment, care shall be taken toavoid traffic on the thick poured gypsum concrete underlay-ment after installation. Damage to the thick poured gypsumconcrete underlayment surface can occur if water, oil, p
41、aint, oilbased sweeping compounds, solvent, dirt, or other debris arespilled, applied or tracked onto the thick poured gypsumconcrete underlayment. The thick poured gypsum concreteunderlayment shall be protected by temporary walking boardswherever the thick poured gypsum concrete underlayment willbe
42、 subject to heavy wheeled or concentrated loads.12. Preparation of Thick Poured Gypsum ConcreteUnderlayment Surface12.1 Final preparation of the thick poured gypsum concreteunderlayment shall be accomplished just prior to application ofthe floor covering. The surface of the floor shall be cleaned of
43、all loose material by scraping, brushing, vacuuming, or othermethods, or combination thereof, recommended by the resilientflooring manufacturer, immediately before commencing instal-lation of resilient flooring.12.2 Prior to installation of finished floor goods, thickpoured gypsum concrete underlaym
44、ent shall be tested inaccordance with Test Method D4263 or with an electronicmoisture meter with a gypsum scale recommended by themanufacturer of the thick poured gypsum concrete underlay-ment. Acceptance criteria for the suitability of the substrate forinstallation of resilient floor covering shall
45、 be provided by themanufacturer of the resilient floor covering.12.3 The thick poured gypsum concrete underlayment shallbe prepared with a topcoat/sealer if required by the manufac-turer of the thick poured gypsum concrete underlayment.12.4 Final surface preparation of the thick poured gypsumconcret
46、e underlayment shall be in accordance with the recom-mendations of the finished floor goods manufacturer. The thickpoured gypsum concrete underlayment shall be primed prior tothe installation of resilient floor covering in accordance withthe recommendations of the manufacturer of the resilient floor
47、covering.13. Keywords13.1 concrete; flooring; gypsum; poured gypsum concrete;practice; resilient; sound mat; underlaymentASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expres
48、sly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,
49、 either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
