Page 6 - Sourcebook 2015 OE
P. 6

Sourcebook 2015

                                                   The Stained Glass Association of America

frame, sash or other substrate into which the           Glazing Sealant: It is highly recom-       resin 5⁄8" to 7⁄8" in thickness, to create translu-
panel is installed. These surface-applied bars     mended that all sealant be of the non-acetic    cent windows and walls of great beauty.
further strengthen and support the installed       gas-forming or neutral-cure variety and that
panel of leaded stained glass. Round bars          it be chosen based on the composition of the         The epoxy used in the casting of faceted
usually measuring 3⁄8 inch in diameter, tied to    materials and substrates to be sealed.          glass panels must be a specially formulated
the panels with twisted copper wires, are the      Appropriate bond-breaking tape and              slab-glass-setting compound consisting of
most flexible and resilient, and therefore         ethafoam backer rod should be used as           epoxy resin and hardener. The material must
allow for the greatest amounts of thermal          required to achieve the flexibility necessary   be able to withstand temperatures of +130
movement. Where this system is not suit-           for expansion and contraction of the finished   degrees Fahrenheit on the exterior surface
able, galvanized-steel flat bars can be sol-       installation.                                   and a simultaneous +70 degrees Fahrenheit
dered directly to the surface of the leaded                                                        interior surface (air conditioned), and allow
glass panel.                                                   Faceted Stained Glass               for humidity changes of 6% to 100%. In
                                                                   (Dalle de Verre)                addition, cast panels must be water resistant
     Installation: It is recommended that                                                          on tests of 25 lbs. per square foot static air
leaded glass be installed into frames                   Process: A twentieth-century innovation    pressure while 21⁄2 gallons of water pass over
designed specifically for that purpose.            in the art of stained glass introduced the use  the surface of the panel for one hour.
Various types can be considered and include        of glass dalles measuring approximately 8" x
wood, aluminum, steel, bronze and stone.           12" x 1". These dalles, cast in hundreds of          The design and physical opening size
Regardless of the type, the most important         colors, can be cut into shapes and used, in     determine size limitations. However, indi-
consideration is that they are capable of sup-     combination with an opaque matrix of epoxy      vidual panels should not exceed 16 square
porting the unique qualities of the type of                                                        feet. The height to width of a single panel
stained glass that is being installed. When
possible, glazing beads should be used in
conjunction with modern, flexible sealant
systems to allow for flexibility as well as
mechanical engagement of the installed pan-
els of glass.

     The stained glass studio should be con-
sulted as to the best type of frame for the
project at hand, the location and placement
of division bars, and mullion configuration
that will work best with the intended design.
This information should be finalized prior to
ordering the window frames or sash (usually
supplied by the general contractor on a new
building) into which the stained glass will be
installed.

     In general, the type of frame selected
needs to be capable of supporting stained
glass weighing approximately four pounds
per square foot and configured with mul-
lions, allowing sub-division of larger areas
into panels of approximately 12 square feet
or 14 linear perimeter feet. In addition to
the overall structural requirements, the
frames or sash must include a glazing
rebate that measures 3⁄8" to 1⁄2" wide by 3⁄8" to
1⁄2" deep and allows the panels of stained
glass to engage into the frame or sash a
minimum of 1⁄4". An allowance of 3⁄32" to 1⁄8"
between the stained glass panel and the
frame is typical.

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