1、Designation: F 2471 08Standard Practice forInstallation of Thick Poured Lightweight Cellular ConcreteUnderlayments and Preparation of the Surface to ReceiveResilient Flooring1This standard is issued under the fixed designation F 2471; the number immediately following the designation indicates the ye
2、ar 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 covers the installation and preparation
3、ofthe thick poured lightweight cellular concrete underlaymentsover wood structural panel subfloors in commercial structuresor over concrete floors in commercial structures and thepreparation of the thick poured lightweight cellular concreteunderlayment surface prior to the installation of resilientf
4、looring in commercial buildings.1.2 This practice points out the factors that are required tobe controlled while installing thick poured lightweight cellularconcrete underlayment as a base for resilient flooring.1.3 This practice does not cover the structural adequacy ofthe wood structural panel sub
5、floor or concrete subfloor. Thestructural integrity of assemblies is governed by local buildingcodes.1.4 This practice does not supercede the thick pouredlightweight cellular concrete underlayment manufacturers,adhesive manufacturers or resilient flooring manufacturerswritten instructions. Consult t
6、he individual manufacturer forspecific recommendations.1.5 Thick poured lightweight cellular concrete underlay-ments are not suitable for use on concrete slabs on ground dueto potential moisture problems arising from moisture intrusion,unless an adequate vapor retarder or vapor barrier is presentdir
7、ectly beneath the concrete subfloor.1.6 The values stated in inch-pound units are to be regardedas standard. The values stated in parentheses are mathematicalconversions to SI Units, which are provided for informationonly.1.7 This standard does not purport to address all of thesafety concerns, if an
8、y, 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:2C 330 Specification for Lightweight Aggregates for
9、 Struc-tural ConcreteF 141 Terminology Relating to Resilient Floor CoveringsF 710 Practice for Preparing Concrete Floors to ReceiveResilient FlooringF 2170 Test Method for Determining Relative Humidity inConcrete Floor Slabs Using in situ ProbesF 1482 Practice for Installation and Preparation of Pan
10、elType Underlayments to Receive Resilient Flooring3. Terminology3.1 Definitions used in this practice shall be in accordancewith Terminology F 141.3.2 Definitions of Terms Specific to This Standard:3.2.1 fully adhered flooring, nresilient flooring which hasadhesive under the entire product, bonding
11、it to the underlay-ment surface (see Practice F 1482).3.2.2 non-fully adhered 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 (see PracticeF 14
12、82).3.2.3 thick poured lightweight cellular concrete underlay-ment, nthat layer of material composed primarily of Portlandcement (conforming to, Type I, II, or Block Cement) slurry,sand, water, pea gravel and foam that is mixed, pumped andpoured at a minimum thickness of 112 in. (38 mm) in a liquids
13、tate and installed on or over a subfloor to provide anunderlayment.3.2.4 wood structural panel, na panel manufactures fromveneers, or wood strands or wafers, or a combination of veneerand wood strands, or wafers, bonded together with waterproofsynthetic resins or other suitable, waterproof bonding s
14、ystems.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 Dec. 1, 2008. Published January 2009. Originallyapproved in 2005 as F 2471-05.2For referenced ASTM standards,
15、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 194
16、28-2959, United States.4. Significance and Use4.1 This practice provides minimum recommendations forthe installation of thick poured lightweight cellular concretefloor underlayments suitable to receive resilient floor cover-ings. This practice establishes the proper preparation, installa-tion and qu
17、ality control for thick poured lightweight cellularconcrete floor underlayments.4.2 Actual requirements for thick poured lightweight cellu-lar concrete underlayments are generally included as part ofproject plans or specifications and may vary from the recom-mendations set forth in this practice. Pr
18、oject plans or specifi-cations, or both, shall supersede the recommendations set forthin this practice.5. Product Requirements5.1 For the purposes of this practice, thick poured light-weight cellular concrete underlayment shall be Portland ce-ment based compounds.5.2 Thick poured lightweight cellula
19、r concrete underlay-ment shall be tested for pH, measured in accordance withPractice F 710. PH shall not exceed 11.5.3 Thick poured lightweight cellular concrete underlay-ments shall be tested for compressive strength. Specified psishall be a minimum of 2000 psi (13.8 MPa) for use over woodsubfloors
20、 and 3000 psi (20.7 MPa) for use over concretesubfloors.5.4 Field density checks in accordance with SpecificationC 330 shall be made periodically and variations greater than61 pcf (16 kg/m3) between the recommended density and thedensity at the point of discharge will require a modification tothe mi
21、x. Weighing the material at the point of placement in acontainer of a known volume checks the cast density.5.5 Thick poured lightweight cellular concrete underlay-ments shall be tested for the presence of chlorides. Thickpoured lightweight cellular concrete underlayments shall notcontain calcium chl
22、oride. Test method shall be provided by themanufacturer of the thick poured lightweight cellular concreteunderlayment.5.6 Thick poured lightweight cellular concrete underlay-ments shall be tested for density in accordance with Specifi-cation C 330. Specified density shall be a minimum of 110 pcf(176
23、2 kg/m3).6. Storage and Handling of Thick Poured LightweightCellular Concrete Underlayments6.1 Factory-sealed containers of foaming agent shall bestored at room temperature. Materials shall be delivered to thejobsite by the manufacturer of the thick poured lightweightcellular concrete underlayment u
24、sing approved methods.7. General Guidelines7.1 Recommended floor joist spacing is 16 in. (406 mm) oncenter maximum for panel assemblies. Subfloor shall supportdesign loads with maximum L/360 deflection.7.2 Wood and concrete subfloors shall be clean, dry, andstructurally sound so as to support both t
25、he uniform design liveand dead loads in compliance with the local building code andthe resilient flooring manufacturers installation requirements.7.3 The surfaces of the structural subfloor assemblies shallbe clean, smooth, and free of construction wastes such asacoustic and wall texture, over spray
26、, dirt, solvents, oil, grease,residual construction adhesives, adhesive removers, and otherforeign materials. Concrete subfloors shall be 28 days or olderand dry as tested by Test Method F 2170.7.4 Before, during and after installation of thick pouredlightweight cellular concrete underlayment, the G
27、eneral Con-tractor shall be responsible for ensuring that the building shallbe ventilated and heated to a minimum of 50F (10C) untilsubfloor and ambient temperatures have stabilized. Tempera-ture during and after installation shall be maintained untilmaterial has completely cured. The General Contra
28、ctor shallprovide heat and ventilation as necessary to dry the thickpoured lightweight cellular concrete underlayments. In winter,inside temperature shall not exceed 60F (15.6C).37.5 Installation of thick poured lightweight cellular concreteunderlayment shall not begin until the building is enclosed
29、,including roof, windows, doors and other openings. GeneralContractor shall be responsible to provide continuous ventila-tion until the underlayment is dry. Ceilings shall be sprayed orstippled to avoid over spray.7.6 Before installation of thick poured lightweight cellularconcrete underlayment, the
30、 condition of the structural subfloorassemblies and any required elevations shall be inspected andapproved by the general contractor or owner, or both. Allrequired flooring and nailing inspections shall be completed.7.7 Thick poured lightweight cellular concrete underlay-ment installation shall be b
31、y an Applicator approved to do thistype of installation by the manufacturer, experienced in per-forming the work of this practice, who has been trained ininstallation of work similar to the project under construction.38. Preparation of Subfloor8.1 The structural panel subfloor assemblies shall be of
32、wood structural panel construction, dry, level, securely nailed,and reasonably clean, without projections. Loose boards infloors with board subfloors or panels shall be renailed. Badlycupped or warped board subfloors shall be replaced beforeinstallation of underlayment. Concrete subfloors shall be 2
33、8days or older and dry as tested by Test Method F 2170.8.2 All cracks and voids shall be covered or filled with aquick-setting taping or crack filler compound to preventleakage.9. Installation of Underlayment9.1 To minimize damage caused by other trades, the proce-dures in Section 11 shall be follow
34、ed.9.2 Thick poured lightweight cellular underlayment thick-ness shall be a minimum of 112 in. (38 mm).39.3 A subfloor bond breaker shall be required. Asphalt-impregnated Kraft paper shall be stapled to the wood subfloor.9.4 Liquid foaming agent is diluted in water and mixed withair under pressure i
35、n a foam generator to produce stable foam.3Elastizell Product Information, International Conference of Building Officials,A subsidiary of the International Conference of Building Officials EvaluationReports No. 1381, and International Conference of Building Officials, A subsidiaryof the Internationa
36、l Conference of Building Officials Evaluation Report No. 1347.F2471082Concrete consisting of pre-formed foam is added to a cement/sand grout in a ready-mix truck to produce a thick pouredlightweight cellular concrete underlayment that is pumped ontothe subfloor.39.5 Where the thick poured lightweigh
37、t cellular concreteunderlayment widths change at alcoves and other similarrecesses, it shall be reinforced with a 12 in. wide (305 mm) by16 in. long (406 mm) strip of 4 by 4 in. (102 by 102 mm) 14/14gauge welded wire mesh, extending each side of the corners atan angle of 45 degrees. As an alternativ
38、e, plates shall beinserted through or a weakened plane joint made with acontinuous 112 in. (38 mm) by 1 in. (25 mm) light gauge steelangle divider.39.6 The maximum size of thick poured lightweight cellularconcrete underlayment between control joints is 20 by 20 ft (6by 6 m).39.7 The thick poured lig
39、htweight cellular concrete underlay-ment shall be scored at doorways serving rooms larger than200 ft2(18.6 m2).39.8 All areas to receive resilient floor coverings shall besteel troweled.9.9 For sound control purposes, perimeter caulking shall beinstalled.39.10 If plastic shrinkage cracking occurs, e
40、ven though it isrepaired, a weakened section may remain which is vulnerableto further cracking. All weakened sections shall be removed.10. Field Quality Control10.1 Thick poured lightweight cellular concrete underlay-ment shall be tested for slump as it is being installed. The mixdesign shall be as
41、recommended by the manufacturer of thethick poured lightweight cellular concrete underlayment.10.2 Thick poured lightweight cellular concrete underlay-ments shall be tested for density. Specified density shall be aminimum of 110 pcf (1762 kg/m3).10.3 To determine minimum compressive strengths, speci
42、-mens of poured lightweight cellular concrete shall be taken atthe point of placement in 6 by 12 in. (150 by 300 mm)cylinders. Compressive strength tests shall be done in accor-dance with Specification C 330. Manufacturer of the thickpoured lightweight cellular concrete underlayment shall rec-ommend
43、 how often sample cylinders shall be taken.11. Protection from Other Trades11.1 Because satisfactory performance of the finish flooringdepends in part on the condition of the surface of the thickpoured lightweight cellular concrete underlayment, care shallbe taken to avoid traffic on the thick poure
44、d lightweight cellularconcrete underlayment after installation. Loads and foot trafficshall be kept off the underlayment for 24 h. The underlaymentshall not be loaded with drywall for one week. When loaded,the loads shall be distributed and not concentrated at centerspan. Damage to the underlayment
45、surface or the resilientflooring installation can occur if water, oil, paint, solvent, dirt,and other debris are spilled or tracked onto the thick pouredlightweight cellular concrete underlayment.12. Preparation of Thick Poured Lightweight CellularConcrete Underlayment Surface12.1 Final preparation
46、of the thick poured lightweight cel-lular concrete underlayment shall be accomplished just prior toapplication of the floor covering. The surface of the floor shallbe cleaned of all loose material by scraping, brushing, vacu-uming, or other methods, or combination thereof, recom-mended by resilient
47、flooring manufacturer, immediately beforecommencing installation of resilient flooring.12.2 All cracked areas shall be repaired and replaced ifnecessary. Any loose areas shall be epoxy injected.12.3 Thick poured lightweight cellular concrete underlay-ments shall be tested for relative humidity in ac
48、cordance withTest Method F 2170.12.4 Surface cracks, grooves, depressions, and other irregu-larities shall be filled or smoothed with appropriate patching orunderlayment compound for filling or smoothing, or both,wood, fiber-cement, or gypsum fiber panel surfaces. Patchingand self-leveling compounds
49、 for use on panel underlaymentsshall be moisture and alkali-resistant and suitable for commer-cial installations. Refer to patch and self-leveling compoundmanufacturers recommendations for mix and application in-structions. Also check resilient manufacturers recommenda-tions.12.5 Prior to installation of finished floor goods, thickpoured lightweight cellular concrete underlayment shall betested in accordance with Test Method D 4263 or with anelectronic moisture meter with a concrete scale recommendedby the manufacturer of the thick poured lightweight cellularconcrete un
