1、Designation: F2471 08F2471 13Standard Practice forInstallation of Thick Poured Lightweight Cellular ConcreteUnderlayments and Preparation of the Surface to ReceiveResilient Flooring1This standard is issued under the fixed designation F2471; the number immediately following the designation indicates
2、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 covers the installation and prepar
3、ation of the thick poured lightweight cellular concrete underlayments overwood structural panel subfloors in commercial structures or over concrete floors in commercial structures and the preparation ofthe thick poured lightweight cellular concrete underlayment surface prior to the installation of r
4、esilient flooring in commercialbuildings.1.2 This practice points out the factors that are required to be controlled while installing thick poured lightweight cellularconcrete underlayment as a base for resilient flooring.1.3 This practice does not cover the structural adequacy of the wood structura
5、l panel subfloor or concrete subfloor. Thestructural integrity of assemblies is governed by local building codes.1.4 This practice does not supercede the thick poured lightweight cellular concrete underlayment manufacturers, adhesivemanufacturers or resilient flooring manufacturers written instructi
6、ons. Consult the individual manufacturer for specificrecommendations.1.5 Thick poured lightweight cellular concrete underlayments are not suitable for use on concrete slabs on ground due topotential moisture problems arising from moisture intrusion, unless an adequate vapor retarder or vapor barrier
7、 is present directlybeneath the concrete subfloor.1.6 The values stated in inch-pound units are to be regarded as standard. The values stated in parentheses are mathematicalconversions to SI Units, which are provided for information only.1.7 This standard does not purport to address all of the safet
8、y concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C330 Specification for Lightweight A
9、ggregates for Structural ConcreteF141 Terminology Relating to Resilient Floor CoveringsF710 Practice for Preparing Concrete Floors to Receive Resilient FlooringF2170 Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ ProbesF1482 Practice for Installation and Preparat
10、ion of Panel Type Underlayments to Receive Resilient FlooringF2678 Practice for Preparing Panel Underlayments, Thick Poured Gypsum Concrete Underlayments, Thick Poured LightweightCellular Concrete Underlayments, and Concrete Subfloors with Underlayment Patching Compounds to Receive ResilientFlooring
11、3. Terminology3.1 Definitions used in this practice shall be in accordance with Terminology F141.3.2 Definitions of Terms Specific to This Standard:1 This practice is under the jurisdiction of ASTM Committee F06 on Resilient Floor Coverings and is the direct responsibility of Subcommittee F06.40 on
12、Practices.Current edition approved Dec. 1, 2008May 1, 2013. Published January 2009June 2013. Originally approved in 2005 as F2471-05. Last previous edition approved in 2008as F2471-08. DOI: 10.1520/F2471-08.10.1520/F2471-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or cont
13、actASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have bee
14、n made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document
15、.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 fully adhered flooring, nresilient flooring which has adhesive under the entire product, bonding it to the underlaymentsurface (see Practice F1482).3.2.2 non-fully adhered floorin
16、g, nresilient flooring that may be loose laid, in which no adhesive is utilized, or partiallybonded to the surface of the underlayment, typically at seams and the surrounding perimeter of the product (see Practice F1482).3.2.3 thick poured lightweight cellular concrete underlayment , nthat layer of
17、material composed primarily of Portland cement(conforming to, Type I, II, or Block Cement) slurry, sand, water, pea gravel and foam that is mixed, pumped and poured at aminimum thickness of 112 in. (38 mm) in a liquid state and installed on or over a subfloor to provide an underlayment.3.2.4 wood st
18、ructural panel, na panel manufactures from veneers, or wood strands or wafers, or a combination of veneer andwood strands, or wafers, bonded together with waterproof synthetic resins or other suitable, waterproof bonding systems.4. Significance and Use4.1 This practice provides minimum recommendatio
19、ns for the installation of thick poured lightweight cellular concrete floorunderlayments suitable to receive resilient floor coverings. This practice establishes the proper preparation, installation and qualitycontrol for thick poured lightweight cellular concrete floor underlayments.4.2 Actual requ
20、irements for thick poured lightweight cellular concrete underlayments are generally included as part of projectplans or specifications and may vary from the recommendations set forth in this practice. Project plans or specifications, or both,shall supersede the recommendations set forth in this prac
21、tice.5. Product Requirements5.1 For the purposes of this practice, thick poured lightweight cellular concrete underlayment shall be Portland cement basedcompounds.5.2 Thick poured lightweight cellular concrete underlayment shall be tested for pH, measured in accordance with Practice F710.PH shall no
22、t exceed 11.5.3 Thick poured lightweight cellular concrete underlayments shall be tested for compressive strength. Specified psi shall be aminimum of 2000 psi (13.8 MPa) for use over wood subfloors and 3000 psi (20.7 MPa) for use over concrete subfloors.5.4 Field density checks in accordance with Sp
23、ecification C330 shall be made periodically and variations greater than 61 pcf(16 kg/m3) between the recommended density and the density at the point of discharge will require a modification to the mix.Weighing the material at the point of placement in a container of a known volume checks the cast d
24、ensity.5.5 Thick poured lightweight cellular concrete underlayments shall be tested for the presence of chlorides. Thick pouredlightweight cellular concrete underlayments shall not contain calcium chloride. Test method shall be provided by the manufacturerof the thick poured lightweight cellular con
25、crete underlayment.5.6 Thick poured lightweight cellular concrete underlayments shall be tested for density in accordance with Specification C330.Specified density shall be a minimum of 110 pcf (1762 kg/m3).6. Storage and Handling of Thick Poured Lightweight Cellular Concrete Underlayments6.1 Factor
26、y-sealed containers of foaming agent shall be stored at room temperature. Materials shall be delivered to the jobsiteby the manufacturer of the thick poured lightweight cellular concrete underlayment using approved methods.7. General Guidelines7.1 Recommended floor joist spacing is 16 in. (406 mm) o
27、n center maximum for panel assemblies. Subfloor shall support designloads with maximum L/360 deflection.7.2 Wood and concrete subfloors shall be clean, dry, and structurally sound so as to support both the uniform design live anddead loads in compliance with the local building code and the resilient
28、 flooring manufacturers installation requirements.7.3 The surfaces of the structural subfloor assemblies shall be clean, smooth, and free of construction wastes such as acousticand wall texture, over spray, dirt, solvents, oil, grease, residual construction adhesives, adhesive removers, and other fo
29、reignmaterials. Concrete subfloors shall be 28 days or older and dry as tested by Test Method F2170.7.4 Before, during and after installation of thick poured lightweight cellular concrete underlayment, the General Contractor shallbe responsible for ensuring that the building shall be ventilated and
30、heated to a minimum of 50F (10C) until subfloor and ambienttemperatures have stabilized. Temperature during and after installation shall be maintained until material has completely cured. TheGeneral Contractor shall provide heat and ventilation as necessary to dry the thick poured lightweight cellul
31、ar concreteunderlayments. In winter, inside temperature shall not exceed 60F (15.6C).33 Elastizell Product Information, International Conference of Building Officials, A subsidiary of the International Conference of Building Officials Evaluation Reports No.1381, and International Conference of Build
32、ing Officials, A subsidiary of the International Conference of Building Officials Evaluation Report No. 1347.F2471 1327.5 Installation of thick poured lightweight cellular concrete underlayment shall not begin until the building is enclosed,including roof, windows, doors and other openings. General
33、Contractor shall be responsible to provide continuous ventilation untilthe underlayment is dry. Ceilings shall be sprayed or stippled to avoid over spray.7.6 Before installation of thick poured lightweight cellular concrete underlayment, the condition of the structural subfloorassemblies and any req
34、uired elevations shall be inspected and approved by the general contractor or owner, or both. All requiredflooring and nailing inspections shall be completed.7.7 Thick poured lightweight cellular concrete underlayment installation shall be by an Applicator approved to do this type ofinstallation by
35、the manufacturer, experienced in performing the work of this practice, who has been trained in installation of worksimilar to the project under construction.38. Preparation of Subfloor8.1 The structural panel subfloor assemblies shall be of wood structural panel construction, dry, level, securely na
36、iled, andreasonably clean, without projections. Loose boards in floors with board subfloors or panels shall be renailed. Badly cupped orwarped board subfloors shall be replaced before installation of underlayment. Concrete subfloors shall be 28 days or older and dryas tested by Test Method F2170.8.2
37、 All cracks and voids shall be covered or filled with a quick-setting taping or crack filler compound to prevent leakage.9. Installation of Underlayment9.1 To minimize damage caused by other trades, the procedures in Section 11 shall be followed.9.2 Thick poured lightweight cellular underlayment thi
38、ckness 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 with air under pressure in a foam generator to produce stable foam.Concrete consis
39、ting of pre-formed foam is added to a cement/sand grout in a ready-mix truck to produce a thick poured lightweightcellular concrete underlayment that is pumped onto the subfloor.39.5 Where the thick poured lightweight cellular concrete underlayment widths change at alcoves and other similar recesses
40、, itshall be reinforced with a 12 in. wide (305 mm) by 16 in. long (406 mm) strip of 4 by 4 in. (102 by 102 mm) 14/14 gauge weldedwire mesh, extending each side of the corners at an angle of 45 degrees. As an alternative, plates shall be inserted through or aweakened plane joint made with a continuo
41、us 112 in. (38 mm) by 1 in. (25 mm) light gauge steel angle divider.39.6 The maximum size of thick poured lightweight cellular concrete underlayment between control joints is 20 by 20 ft (6 by6 m).39.7 The thick poured lightweight cellular concrete underlayment shall be scored at doorways serving ro
42、oms larger than 200ft2 (18.6 m2).39.8 All areas to receive resilient floor coverings shall be steel troweled.9.9 For sound control purposes, perimeter caulking shall be installed.39.10 If plastic shrinkage cracking occurs, even though it is repaired, a weakened section may remain which is vulnerable
43、 tofurther cracking. All weakened sections shall be removed.10. Field Quality Control10.1 Thick poured lightweight cellular concrete underlayment shall be tested for slump as it is being installed. The mix designshall be as recommended by the manufacturer of the thick poured lightweight cellular con
44、crete underlayment.10.2 Thick poured lightweight cellular concrete underlayments shall be tested for density. Specified density shall be a minimumof 110 pcf (1762 kg/m3).10.3 To determine minimum compressive strengths, specimens of poured lightweight cellular concrete shall be taken at thepoint of p
45、lacement in 6 by 12 in. (150 by 300 mm) cylinders. Compressive strength tests shall be done in accordance withSpecification C330. Manufacturer of the thick poured lightweight cellular concrete underlayment shall recommend how oftensample cylinders shall be taken.11. Protection from Other Trades11.1
46、Because satisfactory performance of the finish flooring depends in part on the condition of the surface of the thick pouredlightweight cellular concrete underlayment, care shall be taken to avoid traffic on the thick poured lightweight cellular concreteunderlayment after installation. Loads and foot
47、 traffic shall be kept off the underlayment for 24 h. The underlayment shall not beloaded with drywall for one week. When loaded, the loads shall be distributed and not concentrated at center span. Damage to theunderlayment surface or the resilient flooring installation can occur if water, oil, pain
48、t, solvent, dirt, and other debris are spilledor tracked onto the thick poured lightweight cellular concrete underlayment.F2471 13312. Preparation of Thick Poured Lightweight Cellular Concrete Underlayment Surface12.1 Final preparation of the thick poured lightweight cellular concrete underlayment s
49、hall be accomplished just prior toapplication of the floor covering. The surface of the floor shall be cleaned of all loose material by scraping, brushing, vacuuming,or other methods, or combination thereof, recommended by resilient flooring manufacturer, immediately before commencinginstallation of resilient flooring.12.2 All cracked areas shall be repaired and replaced if necessary. Any loose areas shall be epoxy injected.12.3 Thick poured lightweight cellular concrete underlayments shall be tested for relative humidity in accordance with TestMethod F2170.12.4 Surf
