ASTM F2419-11(2021)

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: F2419 − 11 (Reapproved 2021)
Standard Practice for
Installation of Thick Poured Gypsum Concrete
Underlayments and Preparation of the Surface to Receive
Resilient Flooring
This standard is issued under the fixed designation F2419; 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 1.8 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice covers the installation and preparation of
ization established in the Decision on Principles for the
the thick poured gypsum concrete underlayments over wood
Development of International Standards, Guides and Recom-
structural panel subfloors in commercial structures or over
mendations issued by the World Trade Organization Technical
concrete floors in commercial structures and the preparation of
Barriers to Trade (TBT) Committee.
the thick poured gypsum concrete underlayment surface prior
to the installation of resilient flooring in commercial buildings.
2. Referenced Documents
1.2 This practice covers the factors that are required to be
2.1 ASTM Standards:
controlled while installing thick poured gypsum concrete
C472 Test Methods for Physical Testing of Gypsum, Gyp-
underlayment as a base for resilient flooring.
sum Plasters, and Gypsum Concrete
1.3 This practice does not cover the structural adequacy of
D4263 Test Method for Indicating Moisture in Concrete by
the wood structural panel subfloor or concrete subfloor. The
the Plastic Sheet Method
structural integrity of assemblies is governed by local building
F141 Terminology Relating to Resilient Floor Coverings
codes.
F1482 Practice for Installation and Preparation of Panel
Type Underlayments to Receive Resilient Flooring
1.4 This practice does not supersede in any manner the thick
poured gypsum concrete underlayment manufacturers, adhe-
3. Terminology
sive manufacturer’s or resilient flooring manufacturer’s written
3.1 Definitions—Definitions used in this practice shall be in
instructions. Consult the individual manufacturer for specific
recommendations. accordance with Terminology F141.
3.2 Definitions of Terms Specific to This Standard:
1.5 Thick poured gypsum concrete underlayments are not
suitable for use on concrete slabs on ground due to potential 3.2.1 fully adhered flooring, n—resilient flooring which has
adhesive under the entire product, bonding it to the underlay-
moisture problems arising from moisture intrusion, unless an
adequate vapor retarder or vapor barrier is present directly ment surface. F1482
beneath the concrete subfloor.
3.2.2 non-fully adhered flooring, n—resilient flooring that
may be loose laid, in which no adhesive is utilized, or partially
1.6 The values stated in inch-pound units are to be regarded
bonded to the surface of the underlayment, typically at seams
as standard. The values stated in parentheses are approximate
and the surrounding perimeter of the product. F1482
mathematical conversions to SI units, which are provided for
information only.
3.2.3 subfloor, n—that wood or concrete structural layer
intendedtoprovidesupportfordesignloadswhichmayreceive
1.7 This standard does not purport to address all of the
resilient floor coverings directly if the surface is appropriate or
safety concerns, if any, associated with its use. It is the
indirectly via an underlayment if its surface is not suitable or if
responsibility of the user of this standard to establish appro-
underlayment is required by appropriate code authorities.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.2.4 gypsum concrete underlayment, n—that layer of
material, with binder content composed primarily of gypsum
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 Oct. 1, 2021. Published October 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2017 as F2419-11 (2017). DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F2419-11R21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2419 − 11 (2021)
cement and Portland cement that is mixed with sand and water, 7. General Guidelines
then pumped and poured in a liquid state to be installed on or
7.1 Recommended thickness of thick poured gypsum con-
over a subfloor to provide a monolithic surface suitable to
crete over structurally sound wood is ⁄4 in. (19 mm) minimum.
receive resilient floor coverings.
Recommended minimum thickness over structurally sound
3.2.5 thick poured gypsum concrete underlayment,
concrete or precast concrete is ⁄2 in. (13 mm). Minimum
n—products which are installed in a liquid state over a
thickness over a floor ceiling assembly which contains a sound
structurallysoundconcreteorprecastsubfloorataminimumof
mat shall be 1 in. (25 mm). Subfloor must support design loads
⁄2 in. (13 mm) or a structurally sound wood subfloor at a
with maximum L360 deflection.
minimum of ⁄4 in. (19 mm) which when dry form an integral
7.2 Wood and concrete subfloors shall be structurally sound,
part of the floor ceiling assembly for fire resistance and sound
clean and dry so as to support both the design live and dead
ratings, satisfy building codes for thick poured gypsum con-
loads in compliance with the local building code and the
crete underlayments, and provide a suitable floor surface for
resilient flooring manufacturers installation requirements.
the installation of resilient floor coverings.
7.3 The finished surfaces of the wood or concrete subfloor
3.2.6 sound mat, n—a membrane installed between a struc-
shall be properly prepared, clean, dry, smooth, and free of
turally sound subfloor and a thick poured gypsum concrete
construction wastes such as acoustic and wall texture,
underlayment to increase sound reduction in the floor ceiling
overspray, dirt, solvents, oil, grease, residual construction
assembly.
adhesives, adhesive removers, and other foreign materials.
Concrete subfloors shall be fully cured and 28 days or older.
4. Significance and Use
7.4 Before, during and after installation of thick poured
4.1 This practice provides minimum recommendations for
gypsum concrete underlayment, the general contractor shall be
the installation of thick poured gypsum concrete floor under-
responsible for ensuring that the building shall be ventilated
layments suitable to receive resilient floor coverings. This
and heated to a minimum of 50°F (10°C) until subfloor and
practice establishes the proper preparation, installation and
ambient temperatures have stabilized. Temperature during and
quality control for thick poured gypsum concrete floor under-
after installation shall be maintained until material has com-
layments.
pletely cured. The general contractor shall provide heat and
4.2 Actual requirements for thick poured gypsum concrete
ventilation as necessary to dry the thick poured gypsum
underlaymentsaregenerallyincludedaspartofprojectplansor 3
concrete underlayment.
specifications and may vary from the recommendations set
7.5 Installation of thick poured gypsum concrete underlay-
forth in this practice. Project plans or specifications, or both,
ment shall not begin until the building is enclosed, including
shall supersede the recommendations s
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