ASTM F2471-19
(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
4.1 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.
4.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Jan-2019
- Technical Committee
- F06 - Resilient Floor Coverings
- Drafting Committee
- F06.40 - Practices
Relations
- Effective Date
- 01-Feb-2019
- Effective Date
- 01-Aug-2023
- Effective Date
- 15-Jan-2020
- Effective Date
- 01-Dec-2019
- Effective Date
- 01-Mar-2019
- Effective Date
- 01-Feb-2019
- Effective Date
- 01-Jan-2018
- Effective Date
- 01-Sep-2017
- Effective Date
- 01-Sep-2017
- Effective Date
- 01-Dec-2016
- Effective Date
- 01-Jul-2016
- Effective Date
- 01-May-2016
- Effective Date
- 01-Mar-2012
- Effective Date
- 01-Dec-2011
- Effective Date
- 01-Aug-2011
Overview
ASTM F2471-19, titled "Standard Practice for Installation of Thick Poured Lightweight Cellular Concrete Underlayments and Preparation of the Surface to Receive Resilient Flooring," provides comprehensive guidance on the proper installation and preparation of thick poured lightweight cellular concrete underlayments in commercial buildings. This standard is essential for ensuring a uniform, stable, and resilient base for the successful installation of resilient floor coverings over wood structural panel subfloors or concrete slabs.
ASTM F2471-19 focuses on the specific installation procedures, subfloor preparation, quality control practices, and limitations for cellular concrete underlayments, emphasizing the importance of adhering to both the manufacturer’s instructions and project-specific requirements.
Key Topics
- Minimum Requirements: Establishes baseline criteria for preparing surfaces and installing thick poured lightweight cellular concrete underlayments suitable for resilient flooring.
- Subfloor Compatibility: Covers installation over wood structural panels or concrete floors in commercial structures; not suitable for concrete slabs directly on ground without an adequate vapor retarder.
- Preparation and Testing: Recommends that subfloors be clean, dry, level, and structurally sound, with all cracks and voids filled. Testing for pH, density, compressive strength, and moisture content is required.
- Installation Procedures:
- Use of a bond breaker (such as asphalt-impregnated Kraft paper) on wood subfloors
- Requirements for joist spacing, reinforcement at recesses, and control joint placement
- Application methods for mixing and pouring lightweight cellular concrete
- Recommendations for steel troweling and ensuring sound control with perimeter caulking
- Quality Control: Outlines periodic checks for material density, field testing for compressive strength, and procedures for field quality control during and after installation.
- Surface Preparation Prior to Flooring: Specifies that substrates must be clean, free of debris, and repaired as necessary before installing resilient flooring. Calls for patching of irregularities and the use of primers or sealers, if required by material manufacturers.
- Environmental Considerations: Advises on temperature and ventilation requirements before, during, and after installation to ensure proper curing.
Applications
The ASTM F2471-19 standard is widely applicable in:
- Commercial Building Construction: Ensuring durable and resilient underlayment for high-traffic environments like offices, hospitals, and schools.
- Flooring Renovations: Retrofitting or upgrading subfloor systems to accommodate modern resilient flooring solutions.
- Sound and Fire Control: Providing guidelines for underlayments that support sound-dampening and fire-resistance requirements.
- Moisture Management: Addressing best practices to prevent moisture-related failures, crucial for multi-story and mixed-use structures.
By following ASTM F2471-19, construction professionals can mitigate risks associated with improper installation, such as cracking, moisture intrusion, or incompatibility with finished floor goods. The standard complements site-specific specifications and manufacturer recommendations, optimizing the performance and longevity of resilient flooring systems.
Related Standards
Professionals implementing ASTM F2471-19 may also find the following ASTM standards relevant for complementary or preparatory steps:
- ASTM C330: Specification for Lightweight Aggregates for Structural Concrete
- ASTM C796 & C869: Specifications related to foaming agents for producing cellular concrete
- ASTM F141: Terminology Relating to Resilient Floor Coverings
- ASTM F710: Practice for Preparing Concrete Floors to Receive Resilient Flooring
- ASTM F1482: Practice for the Installation and Preparation of Panel Type Underlayments to Receive Resilient Flooring
- ASTM F2170: Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes
- ASTM F2678: Practice for Preparing Panel Underlayments, Thick Poured Gypsum or Cellular Concrete Underlayments, and Subfloors with Patching Compounds to Receive Resilient Flooring
Utilizing ASTM F2471-19 in conjunction with these related standards helps ensure best practices in design, preparation, and installation of resilient flooring systems over cellular concrete underlayments.
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Frequently Asked Questions
ASTM F2471-19 is a standard published by ASTM International. Its full title is "Standard Practice for Installation of Thick Poured Lightweight Cellular Concrete Underlayments and Preparation of the Surface to Receive Resilient Flooring". This standard covers: SIGNIFICANCE AND USE 4.1 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. 4.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
SIGNIFICANCE AND USE 4.1 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. 4.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM F2471-19 is classified under the following ICS (International Classification for Standards) categories: 91.100.30 - Concrete and concrete products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F2471-19 has the following relationships with other standards: It is inter standard links to ASTM F2471-13, ASTM F141-23, ASTM F141-12(2020), ASTM F2170-19a, ASTM F2170-19, ASTM F710-19, ASTM F2170-18, ASTM F2170-17, ASTM F710-17, ASTM F2170-16b, ASTM F2170-16a, ASTM F2170-16, ASTM F141-12, ASTM F141-11, ASTM F2170-11. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM F2471-19 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2471 − 19
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 F2471; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This practice covers the installation and preparation of
1.8 This international standard was developed in accor-
the thick poured lightweight cellular concrete underlayments
dance with internationally recognized principles on standard-
over wood structural panel subfloors in commercial structures
ization established in the Decision on Principles for the
or over concrete floors in commercial structures and the
Development of International Standards, Guides and Recom-
preparation of the thick poured lightweight cellular concrete
mendations issued by the World Trade Organization Technical
underlayment surface prior to the installation of resilient
Barriers to Trade (TBT) Committee.
flooring in commercial buildings.
2. Referenced Documents
1.2 This practice points out the factors that are required to
be controlled while installing thick poured lightweight cellular
2.1 ASTM Standards:
concrete underlayment as a base for resilient flooring.
C330 Specification for Lightweight Aggregates for Struc-
tural Concrete
1.3 This practice does not cover the structural adequacy of
C796 Test Method for FoamingAgents for Use in Producing
the wood structural panel subfloor or concrete subfloor. The
Cellular Concrete Using Preformed Foam
structural integrity of assemblies is governed by local building
C869 Specification for Foaming Agents Used in Making
codes.
Preformed Foam for Cellular Concrete
1.4 This practice does not supercede the thick poured
F141 Terminology Relating to Resilient Floor Coverings
lightweight cellular concrete underlayment manufacturers’,
F710 Practice for Preparing Concrete Floors to Receive
adhesive manufacturers’ or resilient flooring manufacturers’
Resilient Flooring
written instructions. Consult the individual manufacturer for
F1482 Practice for Installation and Preparation of Panel
specific recommendations.
Type Underlayments to Receive Resilient Flooring
1.5 Thick poured lightweight cellular concrete underlay-
F2170 Test Method for Determining Relative Humidity in
ments are not suitable for use on concrete slabs on ground due
Concrete Floor Slabs Using in situ Probes
to potential moisture problems arising from moisture intrusion,
F2678 Practice for Preparing Panel Underlayments, Thick
unless an adequate vapor retarder or vapor barrier is present
Poured Gypsum Concrete Underlayments, Thick Poured
directly beneath the concrete subfloor.
Lightweight Cellular Concrete Underlayments, and Con-
crete Subfloors with Underlayment Patching Compounds
1.6 The values stated in inch-pound units are to be regarded
to Receive Resilient Flooring
as standard. The values stated in parentheses are mathematical
conversions to SI Units, which are provided for information
3. Terminology
only.
3.1 Definitions used in this practice shall be in accordance
1.7 This standard does not purport to address all of the
with Terminology F141.
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.2.1 fully adhered flooring, n—resilient flooring which has
adhesive under the entire product, bonding it to the underlay-
ment surface (see Practice F1482).
This practice is under the jurisdiction of ASTM Committee F06 on Resilient
Floor Coverings and is the direct responsibility of Subcommittee F06.40 on
Practices. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2019. Published March 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approvedin2005asF2471-05.Lastpreviouseditionapprovedin2013asF2471-13. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/F2471-19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2471 − 19
3.2.2 non-fully adhered flooring, n—resilient flooring that 5.6 Thick poured lightweight cellular concrete underlay-
may be loose laid, in which no adhesive is utilized, or partially ments shall be tested for density in accordance with Specifi-
bonded to the surface of the underlayment, typically at seams cation C330. Specified density shall be a minimum of 110 pcf
and the surrounding perimeter of the product (see Practice (1762 kg/m ).
F1482).
6. Storage and Handling of Thick Poured Lightweight
3.2.3 thick poured lightweight cellular concrete
Cellular Concrete Underlayments
underlayment, n—thatlayerofmaterialcomposedofanyofthe
6.1 Factory-sealed containers of foaming agent shall be
following: Portland cement (conforming to, Type I or II
stored at room temperature. Materials shall be delivered to the
Cement combined in accordance with Test Method C796 and
jobsite by the manufacturer of the thick poured lightweight
Specification C869), sand, water, pea gravel, light weight
cellular concrete underlayment using approved methods.
aggregate and foam, that is mixed, pumped and poured at a
minimum thickness of ⁄4 in. (19 mm) in a liquid state and
7. General Guidelines
installed on or over a subfloor to provide an underlayment.
7.1 Recommended floor joist spacing is 16 in. (406 mm) on
3.2.4 wood structural panel, n—a panel manufactures from
center maximum for panel assemblies. Subfloor shall support
veneers, or wood strands or wafers, or a combination of veneer
design loads with maximum L/360 deflection.
and wood strands, or wafers, bonded together with waterproof
7.2 Wood and concrete subfloors shall be clean, dry, and
synthetic resins or other suitable, waterproof bonding systems.
structurally sound so as to support both the uniform design live
4. Significance and Use and dead loads in compliance with the local building code and
the resilient flooring manufacturers installation requirements.
4.1 This practice provides minimum recommendations for
the installation of thick poured lightweight cellular concrete 7.3 The surfaces of the structural subfloor assemblies shall
be clean, smooth, and free of construction wastes such as
floor underlayments suitable to receive resilient floor cover-
ings. This practice establishes the proper preparation, installa- acoustic and wall texture, over spray, dirt, solvents, oil, grease,
residual construction adhesives, adhesive removers, and other
tion and quality control for thick poured lightweight cellular
concrete floor underlayments. foreign materials. Concrete subfloors shall be 28 days or older
and dry as tested by Test Method F2170.
4.2 Actual requirements for thick poured lightweight cellu-
lar concrete underlayments are generally included as part of 7.4 Before, during and after installation of thick poured
project plans or specifications and may vary from the recom- lightweight cellular concrete underlayment, the General Con-
mendations set forth in this practice. Project plans or tractor shall be responsible for ensuring that the building shall
specifications, or both, shall supersede the recommendations be ventilated and heated to a minimum of 50°F (10°C) until
set forth in this practice. subfloor and ambient temperatures have stabilized. Tempera-
ture during and after installation shall be maintained until
5. Product Requirements material has completely cured. The General Contractor shall
provide heat and ventilation as necessary to dry the thick
5.1 For the purposes of this practice, thick poured light-
poured lightweight cellular concrete underlayments. In winter,
weight cellular concrete underlayment shall be Portland ce-
inside temperature shall not exceed 60°F (15.6°C).
ment based compounds.
7.5 Installation of thick poured lightweight cellular concrete
5.2 Thick poured lightweight cellular concrete underlay-
underlayment shall not begin until the building is enclosed,
ment shall be tested for pH, measured in accordance with
including roof, windows, doors and other openings. General
Practice F710. PH shall not exceed 11.
Contractor shall be responsible to provide continuous ventila-
5.3 Thick poured lightweight cellular concrete underlay-
tion until the underlayment is dry. Ceilings shall be sprayed or
ments shall be tested for compressive strength. Specified psi
stippled to avoid over spray.
shall be a minimum of 2000 psi (13.8 MPa) for use over wood
7.6 Before installation of thick poured lightweight cellular
subfloors and 3000 psi (20.7 MPa) for use over concrete
concrete underlayment, the condition of the structural subfloor
subfloors.
assemblies and any required elevations shall be inspected and
5.4 Field density checks in accordance with Specification
appr
...
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 been made to the previous version. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: F2471 − 13 F2471 − 19
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 F2471; 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 (´) indicates an editorial change since the last revision or reapproval.
1. 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C330 Specification for Lightweight Aggregates for Structural Concrete
C796 Test Method for Foaming Agents for Use in Producing Cellular Concrete Using Preformed Foam
C869 Specification for Foaming Agents Used in Making Preformed Foam for Cellular Concrete
F141 Terminology Relating to Resilient Floor Coverings
F710 Practice for Preparing Concrete Floors to Receive Resilient Flooring
F1482 Practice for Installation and Preparation of Panel Type Underlayments to Receive Resilient Flooring
F2170 Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes
F1482 Practice for Installation and Preparation of Panel Type Underlayments to Receive Resilient Flooring
This practice is under the jurisdiction of ASTM Committee F06 on Resilient Floor Coverings and is the direct responsibility of Subcommittee F06.40 on Practices.
Current edition approved May 1, 2013Feb. 1, 2019. Published June 2013March 2019. Originally approved in 2005 as F2471-05. Last previous edition approved in
20082013 as F2471-08.-13. DOI: 10.1520/F2471-13.10.1520/F2471-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2471 − 19
F2678 Practice for Preparing Panel Underlayments, Thick Poured Gypsum Concrete Underlayments, Thick Poured Lightweight
Cellular Concrete Underlayments, and Concrete Subfloors with Underlayment Patching Compounds to Receive Resilient
Flooring
3. Terminology
3.1 Definitions used in this practice shall be in accordance with Terminology F141.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 fully adhered flooring, n—resilient flooring which has adhesive under the entire product, bonding it to the underlayment
surface (see Practice F1482).
3.2.2 non-fully adhered flooring, n—resilient flooring that may be loose laid, in which no adhesive is utilized, or partially
bonded 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 , underlayment, n—that layer of material composed primarily of
of any of the following: Portland cement (conforming to, Type I, II, or Block Cement) slurry, I or II Cement combined in
accordance with Test Method C796 and Specification C869), sand, water, pea gravel and foamgravel, light weight aggregate and
foam, that is mixed, pumped and poured at a minimum thickness of 1 ⁄4 in. (38(19 mm) in a liquid state and installed on or over
a subfloor to provide an underlayment.
3.2.4 wood structural panel, n—a panel manufactures from veneers, or wood strands or wafers, or a combination of veneer and
wood strands, or wafers, bonded together with waterproof synthetic resins or other suitable, waterproof bonding systems.
4. Significance and Use
4.1 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.
4.2 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.
5. Product Requirements
5.1 For the purposes of this practice, thick poured lightweight cellular concrete underlayment shall be Portland cement based
compounds.
5.2 Thick poured lightweight cellular concrete underlayment shall be tested for pH, measured in accordance with Practice F710.
PH shall not exceed 11.
5.3 Thick poured lightweight cellular concrete underlayments shall be tested for compressive strength. Specified psi shall be a
minimum 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 Specification C330 shall be made periodically and variations greater than 61 pcf
(16 kg/m ) 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 density.
5.5 Thick poured lightweight cellular concrete underlayments shall be tested for the presence of chlorides. Thick poured
lightweight cellular concrete underlayments shall not contain calcium chloride. Test method shall be provided by the manufacturer
of the thick poured lightweight cellular concrete 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/m ).
6. Storage and Handling of Thick Poured Lightweight Cellular Concrete Underlayments
6.1 Factory-sealed containers of foaming agent shall be stored at room temperature. Materials shall be delivered to the jobsite
by the manufacturer of the thick poured lightweight cellular concrete underlayment using approved methods.
7. General Guidelines
7.1 Recommended floor joist spacing is 16 in. (406 mm) on center maximum for panel assemblies. Subfloor shall support design
loads 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 and
dead loads in compliance with the local building code and the resilient flooring manufacturers installation requirements.
7.3 The surfaces of the structural subfloor assemblies shall be clean, smooth, and free of construction wastes such as acoustic
and wall texture, over spray, dirt, solvents, oil, grease, residual construction adhesives, adhesive removers, and other foreign
materials. Concrete subfloors shall be 28 days or older and dry as tested by Test Method F2170.
F2471 − 19
7.4 Before, during and after installation of thick poured lightweight cellular concrete underlayment, the General Contractor shall
be responsible for ensuring that the building shall be ventilated and heated to a minimum of 50°F (10°C) until subfloor and ambient
t
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