ASTM C1546-02

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Designation:C1546–02
Standard Guide for
Installation of Gypsum Products in Concealed Radiant
Ceiling Heating Systems
This standard is issued under the fixed designation C 1546; 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 3.1.1 concealed radiant heating system, n—a system that
2 operates by heating the building materials that conceal the heat
1.1 This guide provides information for trades installing
source, which in turn transfer the heat into the heated area by
gypsum products in conjunction with a concealed radiant
radiant emission.
ceiling heating system constructed from thin sheet flexible
3.1.2 facing, n—the finished surface layer through which
radiant heating panels, and for the installation of gypsum
heat is transferred into a heated area.
products after repair of existing concealed radiant ceiling
3.1.3 flexible radiant heating panel, n—a thin sheet heating
heating systems constructed from heating cable or thin sheet
element intended to produce heat when connected to an
flexible radiant heating panels.
electrical supply.
1.2 This guide does not purport to address any aspect of
3.1.4 furring, n—spacer elements added to a building struc-
concealedradiantheatingsystemdesignorperformance,andis
ture to facilitate fastening of gypsum panel products.
limited to the proper installation of gypsum products specified
3.1.5 gypsum product, n—buildingmaterialintendedforuse
for use in a concealed radiant ceiling heating system.
in radiant heated ceiling construction, containing gypsum in its
1.3 This standard does not purport to address all of the
composition or construction.
safety concerns, if any, associated with its use. It is the
3.1.5.1 Discussion—The gypsum products most often asso-
responsibility of the user of this standard to establish appro-
ciated with radiant heating systems are gypsum board and
priate safety and health practices and determine the applica-
gypsum plaster.
bility of regulatory requirements prior to use.
3.1.6 heating cable, n—an electrically insulated cable in-
1.4 The text of this standard references notes and footnotes
tended to produce heat when connected to an electrical supply.
which provide explanatory material. These notes and footnotes
shall not be considered as requirements of the standard.
4. Significance and Use
2. Referenced Documents 4.1 The purpose of this guide is to provide information to
gypsum product installers for the avoidance of hazards asso-
2.1 ASTM Standards:
ciated with the installation of gypsum products adjacent to, or
C 840 Specification for Application and Finishing of Gyp-
surrounding, electric heating components and conductors; and
sum Board
to avoid damage to gypsum products when used in conjunction
C 841 Specification for Installation of Interior Lathing and
with a concealed radiant heating system.
Furring
4.2 The information given in this guide is applicable to
C 842 Specification for Application of Interior Gypsum
repair of existing cable heating systems and to new construc-
Plaster
tion of radiant heating systems constructed from flexible
3. Terminology
radiant heating panels.
3.1 Definitions:
5. Summary of Guide
5.1 Heating System Design:
This guide is under the jurisdiction of ASTM Committee C11 on Gypsum and
5.1.1 The heating system shall be designed to satisfy the
Related Building Materials and Systems and is the direct responsibility of
heating needs of the building and to work effectively with all
Subcommittee C11.03 on Specifications for the Application of Gypsum and Other
building materials specified for use in the heating system
Products in Assemblies.
Current edition approved October 10, 2002. Published December 2002.
installation.
The first edition of this guide replaced Appendix X.7 of Specification
NOTE 1—The architect bears the responsibility of preparing and corre-
C 840 - 99a.
Annual Book of ASTM Standards, Vol 04.01. lating complete plans and specifications, and to engage a professional
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C1546–02
familiar with the heating system to design the system to meet the
5.4.3 Filler added to gypsum plaster used to repair a heating
requirements of 5.1.1 and 5.1.2.
cable system, if any, shall be of sand or similar thermally
conductive material. Thermal insulating fillers such as ver-
5.1.2 Theheatingsystemshallbedesignedsothatagypsum
miculite or perlite, and foaming agents that impair heat transfer
product is not exposed to a temperature more than 125°F
shall not be used in plaster applied to radiant heating systems.
(52°C) for periods of time sufficient to cause calcination.
5.4.4 Application of metal lath shall conform to Specifica-
NOTE 2—The foregoing requirement is intended to provide guidance to
tion C 841. Metal lath and fasteners installed for repair of a
heating system designers, consistent with Specification C 840, in the
cable heating system shall not contact heating cables.
absen
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