ASTM C716-00
(Specification)Standard Specification for Installing Lock-Strip Gaskets and Infill Glazing Materials
Standard Specification for Installing Lock-Strip Gaskets and Infill Glazing Materials
SCOPE
1.1 This specification describes installation procedures for lock-strip gaskets that comply with Specification C542 and for infill glazing materials in lockstrip gasket glazing applications used in building walls which are not more than 15° from a vertical plane. The prime performance considerations are weather tightness against air and water infiltration, and structural integrity under wind loads.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI units in parentheses are provided for information only.
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Designation: C 716 – 00
Standard Specification for
Installing Lock-Strip Gaskets and Infill Glazing Materials
This standard is issued under the fixed designation C 716; 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 C 964 Guide for Lock-Strip Gasket Glazing
1.1 This specification covers installation procedures for
3. Terminology
lock-strip gaskets that comply with Specification C 542 and for
3.1 Definitions—Refer to Terminology C 717 for the fol-
infill glazing materials in lockstrip gasket glazing applications
lowing terms used in this Specification: bite, edge spacer,
used in building walls which are not more than 15° from a
elastomer, gasket, glazing, hardness, joint, lock-strip gasket,
vertical plane. The prime performance considerations are
reglet, sealant, setting block and spacer.
weathertightness against air and water infiltration, and struc-
3.2 Definitions of Terms Specific to This Standard:
tural integrity under wind loads.
3.2.1 clamping pressure, n—the pressure exerted by the lip
1.2 The values stated in inch-pound units are to be regarded
of a lock-strip gasket on material installed in the channel when
as the standard. The SI units in parentheses are provided for
the lock-strip is in place.
information only.
3.2.2 durometer, n—(1) an instrument for measuring the
2. Referenced Documents hardness of rubber-like materials. (2) a term used to identify
the relative hardness of rubber-like materials, for example,
2.1 ASTM Standards:
“low durometer” (relatively soft) or “high durometer” (rela-
C 542 Specification for Lock-Strip Gaskets
tively hard).
C 717 Terminology of Building Seals and Sealants
3.2.3 edge clearance, n—the distance between the bottom
C 963 Specification for Packaging, Identification, Ship-
of a channel of a lock-strip gasket and the edge of material
ment, and Storage of Lock-Strip Gaskets
installed in the channel (see Figs. 1-3).
3.2.4 elongation, n—increase in length, expressed as a
This specification is under the jurisdiction of ASTM Committee C-24 on percentage of the original length.
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.73
3.2.5 filler strip—see lock-strip, the preferred term.
on Compression Seal and Lock-Strip Gaskets.
3.2.6 flange, n—that part of a lock-strip gasket which
Current edition approved Jan. 10, 2000. Published March 2000. Originally
extends to form one side of a channel (see Figs. 1 and 2).
published as C 716 – 73. Last previous edition C 716 – 91 (1995).
Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 716
3.2.23 vertical ladder gasket, n—a ladder gasket installed in
a vertical plane in such a way that the intermediate cross
members (muntins) are horizontal members (see Fig. 3).
3.2.24 web, n—that part of an H-type lock-strip gasket that
extends between the flanges, forming two channels and that
part of a reglet-type lock-strip gasket that extends between the
flanges and spline (see Figs. 1 and 2).
4. Significance and Use
4.1 This specification can be referred to in contract docu-
ments as a method and workmanship standard for the installa-
tion of lock-strip gasket glazing systems. See also related
standards (Specifications C 542 and C 963, Guide C 964, and
FIG. 3 Gasket Systems
Terminology C 717).
5. Installation
3.2.7 gasket, structural—see gasket, lock-strip, the pre-
ferred term. 5.1 Inspection of Components—Before installing gaskets,
3.2.8 gasket, zipper—see gasket, lock-strip, the preferred the installer shall check the mounting frames to see that they
term. are within specified dimensional tolerances and not out-of-
squareorplane,andcheckallgasketsfortype,dimensions,and
3.2.9 H-gasket—see gasket, lock-strip and Fig. 1.
3.2.10 hinge, n—the minimum thickness of gasket material defects such as misalignment at molded corners and damaged
lips. Installation shall not proceed until corrections have been
between the channel recess and the lock-strip cavity; the plane
at which bending occurs when the flange is bent open to made.
receive or release installed material. 5.2 Environmental Conditions—Maximum efficiency and
3.2.11 horizontal ladder gasket, n—aladdergasketinstalled sealing capability of gaskets is achieved in a clean, dry, warm
in a vertical plane in such a way that the intermediate cross environment, with the gasket kept resilient during the entire
members (muntins) are vertical members (see Fig. 3). installation process. During cold weather the use of temporary
3.2.12 ladder gasket, n—a lock-strip gasket in the form of a
enclosures around the units to be glazed or paneled will
subdivided frame having one or more integrally formed inter- facilitate temperature control and also aid in keeping open
mediate cross members (see Fig. 3).
gasket channels clean and dry.
3.2.13 lip, n—the inner face of the tip of a flange on a
5.3 Preparation and Conditioning of Gaskets—Lock-strip
lock-strip gasket (see Figs. 1 and 2).
gaskets require conditioning prior to installation in order to
3.2.14 lip pressure, n—the pressure exerted by the lip of a restore maximum resiliency and remove deformations after
lock-strip gasket on material installed in the channel when the
prolongedstorageinacoiledorstressedposition.Gasketsshall
lock-strip is in place. be unpacked from their containers and conditioned for 24 h in
3.2.15 lock-strip or locking strip, n—the strip that is de-
a temperature not lower than 70°F (21.1°C) by being placed
signed to be inserted in the lock-strip cavity to force the lips flat or hung on racks to permit recovery of their original
against material placed in the channel (see Figs. 1 and 2).
shapes. Racks shall be free of rough surfaces, projections,
3.2.16 lock-strip cavity, n—the groove in the face of a sharp edges, and other conditions that could damage the
lock-strip gasket designed to receive and retain the lock-strip
gaskets. When the ambient temperature is 50°F (10°C) or
(see Figs. 1 and 2). below and a heated space is not available, gaskets shall be
3.2.17 muntin, n—a secondary intermediate member in a
heated by other means to remove deformations and provide a
multiple-opening gasket system subdividing a glazed area. high degree of flexibility and resiliency. This may be done by
3.2.18 reglet gasket —see gasket, lock-strip and Fig. 2.
warming them in hot water or heated containers. Gaskets shall
3.2.19 spacer shim, n—a length of suitable material placed not be heated by being draped over heated units or placed in
in the gasket channel to maintain proper edge clearance at the
direct contact with a flame or fired heating device. The
sides of an installed panel or glass.
installation of glass, panel, and lock-strip shall be completed
3.2.20 supported gasket member, n—a gasket member held
while the gasket is still warm and pliable and with the gasket
in place by a supporting frame member.
channels clean and dry.
3.2.21 spline or tongue, n—that part of a reglet-type lock-
5.4 Use of Tools—To minimize the possibility of damage,
strip gasket which is designed to be installed in a reglet in
sharp or pointed tools or implements such as screwdrivers or
supporting material (see Fig. 2).
putty knives shall not be used on lock-strip gaskets. Suitable
3.2.22 unsupported gasket member, n—a gasket member
gasket installation tools, such as nonmetallic spatulas and
joining infill materials without being held in place by a
engineered lock-strip insertion devices, are available from the
supporting frame member.
gasket manufacturer.
5.5 Use of Lubricants—If necessary a lubricant may be
applied to the contact surfaces of the gasket to ease the
Patented, U.S. 3,068,617 and U.S. 3,213,584. installation and help prevent damage to the gasket, glass, or
C 716
panel. The lubricant shall be nonstaining, nontoxic, noncorro- Pull each corner of outer flange about ⁄4in. (6.35 mm) away
sive, chemically stable, compatible with all contact compo- from the supporting frame with thumb or nonmetallic spatula
nents, easily removable from exposed surfaces by dry wiping
and then release to ensure uncurling any corner lips hidden
or with water, and acceptable to the manufacturer of the from view.
supporting frame, panel, and gasket.
5.7.2 Reglet-Type Gasket—Insert the upper gasket corners
5.6 Use of Supplementary Wet Sealants—The use of supple-
first, and then install the lower gasket corners into the groove
mentary wet sealants in conjunction with lock-strip gasket
or reglet of the supporting frame, seating them firmly with a
installations is only required under certain conditions. Such a
resiliently faced hammer and a wooden or metal block having
condition would occur when the outer lip of the gasket extends
smooth, rounded edges and corners. Then, on each side, insert
over a butt joint in the supporting frame. The void formed
the gasket into the groove at the center of each side working
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