ASTM F2471-05
(Practice)Standard Practice for Installation of Thick Poured Lightweight Cellular Concrete Underlayments and Preparation of the Surface to Receive Resilient Flooring
Standard Practice for Installation of Thick Poured Lightweight Cellular Concrete Underlayments and Preparation of the Surface to Receive Resilient Flooring
SIGNIFICANCE AND USE
This practice provides minimum recommendations for the installation of thick poured lightweight cellular concrete floor underlayments suitable to receive resilient floor coverings. This practice establishes the proper preparation, installation and quality control for thick poured lightweight cellular concrete floor underlayments.
Actual requirements for thick poured lightweight cellular concrete underlayments are generally included as part of project plans 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 practice.
SCOPE
1.1 This practice covers the installation and preparation of the thick poured lightweight cellular concrete underlayments over wood structural panel subfloors in commercial structures or over concrete floors in commercial structures and the preparation of the thick poured lightweight cellular concrete underlayment surface prior to the installation of resilient flooring in commercial buildings.
1.2 This practice points out the factors that are required to be controlled while installing thick poured lightweight cellular concrete underlayment as a base for resilient flooring.
1.3 This practice does not cover the structural adequacy of the wood structural panel subfloor or concrete subfloor. The structural integrity of assemblies is governed by local building codes.
1.4 This practice does not supercede the thick poured lightweight cellular concrete underlayment manufacturers', adhesive manufacturers' or resilient flooring manufacturers' written instructions. Consult the individual manufacturer for specific recommendations.
1.5 Thick poured lightweight cellular concrete underlayments are not suitable for use on concrete slabs on ground due to potential moisture problems arising from moisture intrusion, unless an adequate vapor retarder or vapor barrier is present directly beneath the concrete subfloor.
1.6 The values stated in inch-pound units are to be regarded as standard. The values stated in parentheses are mathematical conversions to SI Units, which are provided for information only.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F2471–05
Standard Practice for
Installation of Thick Poured Lightweight Cellular Concrete
Underlayments and Preparation of the Surface to Receive
Resilient Flooring
This standard is issued under the fixed designation F 2471; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This practice covers the installation and preparation of 2.1 ASTM Standards:
the thick poured lightweight cellular concrete underlayments C 330 Specification for Lightweight Aggregates for Struc-
over wood structural panel subfloors in commercial structures tural Concrete
or over concrete floors in commercial structures and the F 141 Terminology Relating to Resilient Floor Coverings
preparation of the thick poured lightweight cellular concrete F 710 Practice for Preparing Concrete Floors to Receive
underlayment surface prior to the installation of resilient Resilient Floors
flooring in commercial buildings. F 2170 Test Method for Determining Relative Humidity in
1.2 This practice points out the factors that are required to Concrete Floor Slabs Using in situ Probes
be controlled while installing thick poured lightweight cellular F 1482 Practice for Installation and Preparation of Panel
concrete underlayment as a base for resilient flooring. Type Underlayments to Receive Resilient Flooring
1.3 This practice does not cover the structural adequacy of
3. Terminology
the wood structural panel subfloor or concrete subfloor. The
structural integrity of assemblies is governed by local building 3.1 Definitions used in this practice shall be in accordance
with Terminology F 141.
codes.
1.4 This practice does not supercede the thick poured 3.2 Definitions of Terms Specific to This Standard:
3.2.1 fully adhered flooring, n—resilient flooring which has
lightweight cellular concrete underlayment manufacturers’,
adhesive manufacturers’ or resilient flooring manufacturers’ adhesive under the entire product, bonding it to the underlay-
written instructions. Consult the individual manufacturer for ment surface (see Practice F 1482).
3.2.2 non-fully adhered flooring, n—resilient flooring that
specific recommendations.
1.5 Thick poured lightweight cellular concrete underlay- may be loose laid, in which no adhesive is utilized, or partially
bonded to the surface of the underlayment, typically at seams
ments are not suitable for use on concrete slabs on ground due
to potential moisture problems arising from moisture intrusion, and the surrounding perimeter of the product (see Practice
F 1482).
unless an adequate vapor retarder or vapor barrier is present
directly beneath the concrete subfloor. 3.2.3 subfloor, n—that wood structural panel or concrete
layer intended to provide support for design loads, which may
1.6 The values stated in inch-pound units are to be regarded
as standard. The values stated in parentheses are mathematical receive resilient floor coverings directly if the surface is
appropriate or indirectly via an underlayment if its surface is
conversions to SI Units, which are provided for information
only. not suitable or if underlayment is required by appropriate code
authorities.
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3.2.4 thick poured lightweight cellular concrete underlay-
ment, n—that layer of material composed primarily of Portland
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- cement (conforming to, Type I, II, or Block Cement) slurry,
sand, water, pea gravel and foam that is mixed, pumped and
bility of regulatory limitations prior to use.
1 2
This practice is under the jurisdiction of ASTM Committee F06 on Resilient For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Floor Coverings and is the direct responsibility of Subcommittee F06.40 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Practices. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2005. Published July 2005. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F2471–05
poured at a minimum thickness of 1 ⁄2 in. (38 mm) in a liquid 7. General Guidelines
state and installed on or over a subfloor to provide an
7.1 Recommended floor joist spacing is 16 in. (406 mm) on
underlayment.
center maximum for panel assemblies. Subfloor shall support
3.2.5 wood structural panel, n—a panel manufactures from
design loads with maximum L/360 deflection.
veneers, or wood strands or wafers, or a combination of veneer
7.2 Wood and concrete subfloors shall be clean, dry, and
and wood strands, or wafers, bonded together with waterproof
structurally sound so as to support both the uniform design live
synthetic resins or other suitable, waterproof bonding systems.
and dead loads in compliance with the local building code and
the resilient flooring manufacturers installation requirements.
4. Significance and Use
7.3 The surfaces of the structural subfloor assemblies shall
be clean, smooth, and free of construction wastes such as
4.1 This practice provides minimum recommendations for
acoustic and wall texture, over spray, dirt, solvents, oil, grease,
the installation of thick poured lightweight cellular concrete
residual construction adhesives, adhesive removers, and other
floor underlayments suitable to receive resilient floor cover-
foreign materials. Concrete subfloors shall be 28 days or older
ings. This practice establishes the proper preparation, installa-
and dry as tested by Test Method F 2170.
tion and quality control for thick poured lightweight cellular
7.4 Before, during and after installation of thick poured
concrete floor underlayments.
lightweight cellular concrete underlayment, the General Con-
4.2 Actual requirements for thick poured lightweight cellu-
tractor shall be responsible for ensuring that the building shall
lar concrete underlayments are generally included as part of
be ventilated and heated to a minimum of 50°F (10°C) until
project plans or specifications and may vary from the recom-
subfloor and ambient temperatures have stabilized. Tempera-
mendations set forth in this practice. Project plans or specifi-
ture during and after installation shall be maintained until
cations, or both, shall supersede the recommendations set forth
material has completely cured. The General Contractor shall
in this practice.
provide heat and ventilation as necessary to dry the thick
poured lightweight cellular concrete underlayments. In winter,
5. Product Requirements
inside temperature shall not exceed 60°F (15.6°C).
5.1 For the purposes of this practice, thick poured light-
7.5 Installation of thick poured lightweight cellular concrete
weight cellular concrete underlayment shall be Portland ce-
underlayment shall not begin until the building is enclosed,
ment based compounds.
including roof, windows, doors and other openings. General
5.2 Thick poured lightweight cellular concrete underlay-
Contractor shall be responsible to provide continuous ventila-
ment shall be tested for pH, measured in accordance with
tion until the underlayment is dry. Ceilings shall be sprayed or
Practice F 710. PH shall not exceed 11.
stippled to avoid over spray.
5.3 Thick poured lightweight cellular concrete underlay-
7.6 Before installation of thick poured lightweight cellular
ments shall be tested for compressive strength. Specified psi
concrete underlayment, the condition of the structural subfloor
shall be a minimum of 2000 psi (13.8 MPa) for use over wood
assemblies and any required elevations shall be inspected and
subfloors and 3000 psi (20.7 MPa) for use over concrete
approved by the general contractor or owner, or both. All
subfloors.
required flooring and nailing inspections shall be completed.
5.4 Field density checks in accordance with Specification
7.7 Thick poured lightweight cellular concrete underlay-
C 330 shall be made periodically and variations greater than
ment installation shall be by anApplicator approved to do this
61 pcf (16 kg/m ) between the recommended density and the
type of installation by the manufacturer, experienced in per-
density at the point of discharge will require a modification to
forming the work of this practice, who has been trained in
the mix. Weighing the material at the point of placement in a
installation of work similar to the project under construction.
container of a known volume checks the cast density.
5.5 Thick poured lightweight cellular concrete underlay-
8. Preparation of Subfloor
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