ASTM C1487-00

Standard Guide for Remedying Structural Silicone Glazing

SCOPE
1.1 This guide provides recommendations for remedying existing structural sealant glazing (hereinafter called SSG) installations in situ. Remedial work may be necessary when a lite of glass is replaced, for routine maintenance, or after distress is discovered. This guide focuses on large-scale remedies.
1.2 Committee C24 is not aware of any comparable standards published by other organizations.

General Information

• Status: Historical
• Publication Date: 09-Jan-2002
• ICS: 81.040.20 - Glass in building
• Technical Committee: C24 - Building Seals and Sealants

Relations

• Replaced By: ASTM C1487-02 - Standard Guide for Remedying Structural Silicone Glazing
• Effective Date: 10-Jan-2002
• Referred By: ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
• Effective Date: 10-Jan-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 1487 – 00
Standard Guide for
Remedying Structural Silicone Glazing
This standard is issued under the fixed designation C 1487; 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 ence in the field of structural sealant glazing, and who is
capable of design, analysis, and evaluation in the subject.
1.1 This guide provides recommendations for remedying
existing structural sealant glazing (hereinafter called SSG)
4. Significance and Use
installations in situ. Remedial work may be necessary when a
4.1 Guidelines are provided for remedying existing SSG
lite of glass is replaced, for routine maintenance, or after
installations. Refer to Guide C 1401 for a complete discussion
distress is discovered. This guide focuses on large-scale
of proper SSG design, installation, and materials.
remedies.
4.2 Due to the unlimited range of materials that may be used
1.2 Committee C24 is not aware of any comparable stan-
in a particular building, and because each design is unique, the
dards published by other organizations.
information contained in this guide is general in nature.
2. Referenced Documents 4.3 This guide should not be the only reference consulted
when designing remedies for SSG. For example, the local
2.1 ASTM Standards:
building code and the manufacturers’ product literature for the
C 717 Terminology for Building Seals and Sealants
actual materials used, if known, also should be considered. The
C 1392 Guide for Evaluating Failure of Structural Sealant
sealant manufacturer(s) should be involved fully with the
Glazing
remedial design.
C 1394 Guide for In-Situ Structural Silicone Glazing Evalu-
4.4 This guide is intended to be a resource, but it is not a
ation
2 substitute for experience and judgement in designing remedies
C 1401 Guide for Structural Sealant Glazing
for the specialized types of construction discussed. It is
E 330 Test Method for Structural Performance of Exterior
intended to be used in conjunction with other resources as an
Windows, Curtain Walls, and Doors by Uniform Static Air
aid in remedying problems with existing SSG.
Pressure Difference
E 997 Test Method for Structural Performance of Glass in
5. Introduction
Exterior Windows, Curtain Walls, and Doors Under the
5.1 There are numerous reasons that a building owner or
Influence of Uniform Static Loads by Destructive Method
manager, hereinafter referred to as owner, may choose to
E 1233 Test Method for Structural Performance of Exterior
remedy an SSG system, including routine maintenance or to
Windows, Curtain Walls, and Doors by Cyclic Static Air
3 correct discovered deficiencies. Regardless of the reason that
Pressure Differential
such a remedy is undertaken, it is recommended that the
3. Terminology remedial design and construction be performed under the
supervision of a qualified person.
3.1 Definitions—Definitions of the terms used in this guide
5.2 It is essential to begin the remedial process with a
are found in Terminology C 717.
comprehensive evaluation, in accordance with the guidelines
3.2 Definitions of Terms Specific to This Standard:
established in Guide C 1394. The underlying cause of failure
3.2.1 distress, n—the individual or collective physical mani-
must be understood fully prior to implementing a remedy;
festations of a failure as perceivable problems. For structural
otherwise, the failure may be repeated.
sealant glazing, such distress may include sealant adhesive
5.3 Based on the outcome of the evaluation, various rem-
failure, sealant cohesive failure, shifting of a lite, loss of a lite,
edies may be indicated. The potential remedies include, de-
or water infiltration (see Guide C 1394).
pending on the pervasiveness and the nature of the problem,
3.2.2 qualified person, n—one with a recognized degree or
the following:
professional registration and extensive knowledge and experi-
5.3.1 Minor, isolated repairs, such as the replacement of an
individual lite of glass, can be performed by a competent
This guide is under the jurisdiction of ASTM Committee C24 on Building Seals
glazier trained in the proper installation of SSG. If the original
and Sealants and is the direct responsibility of Subcommittee C24.35 on Structural
Sealants. SSG was properly done, then such minor repairs can be
Current edition approved Dec. 10, 2000. Published January 2001.
performed simply by duplicating the original procedures.
Annual Book of ASTM Standards, Vol 04.07.
5.3.2 In-situ remedial work is necessary where pervasive
Annual Book of ASTM Standards, Vol 04.11.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 1487
problems exist in an SSG application, such as due to poor one field test procedure is as follows:
design or workmanship during original construction. 7.4.1 Perform a minimum of three tests in selected mock-up
5.3.3 Complete reglazing may be necessary in extreme areas. More tests should be performed depending on the
cases or at the end of the useful service life, in accordance with reasons for repair, or if the existing conditions vary with
the principles for new SSG. For example, if the existing joint exposure or other variables.
configuration does not allow adequate cleaning to replace a 7.4.2 Apply structural sealant and accessories to actual
structural joint, it may be necessary to reglaze, because adhesion surfaces exactly as they are intended to be installed
adhesion is critical to the performance of SSG and cleaning is during full-scale production work.
critical to adhesion. 7.4.3 Adjust the installation so that the structural sealant is
5.4 The remainder of this guide particularly addresses the exposed, for example, a weatherseal joint may have to be
type of in-situ remedial SSG projects as described in 5.3.2, to omitted during testing.
correct a pervasive problem without comprehensive reglazing. 7.4.4 After the cure time recommended by the sealant
manufacturer, install chambers over the test joints and adjacent
6. Remedial Design
substrates. Bed chambers in sealant and adhere to the face of
6.1 If it is determined that a large-scale remedial program is
the metal and glass, leaving the top open for filling. See Fig. 1.
necessary, then a remedial design should be developed by a
7.4.5 Fill the chambers with distilled water, causing the face
qualified person.
of the test joints to be completely immersed in water. Seal the
6.2 Depending on the cause of the problem(s) with the
top edge of the chambers after filling, to prevent evaporation.
existing installation, it may not be prudent to rely on the
In cold climates, consideration should be given to protecting
original SSG design.
the chamber from freezing.
6.3 The remedial design should include the following: 7.4.6 After seven days water immersion, remove chambers
6.3.1 Calculations of the structural sealant stress so that the
and perform adhesion tests as prescribed by the sealant
final installation will comply with the SSG industry guidelines manufacturer. Acceptance criteria should be determined by the
(see Guide C 1401)
...