corners and fabrication intersections to make the sash
watertight. Put a coat of primer paint on all sealing
surfaces of wood sash and carbon steel sash. Use
appropriate solvents to remove grease, lacquers, and
other organic-protecting finishes from sealing surfaces
of aluminum sash.
Wood
On old wood sashes, you must clean all putty runs
of broken glass fragments and glazier’s points—
triangular pieces of zinc or galvanized steel driven into
the rabbet. Remove loose paint and putty by scraping.
Wipe the surface clean with a cloth saturated in mineral
spirits or turpentine; prime the putty runs and allow them
to dry.
On new wood sashes, you should remove the dust,
prime the putty runs, and allow them to dry. All new
wood sashes should be pressure treated for decay
protection.
Metal
On old metal sashes, you must remove loose paint
or putty by scraping. Use steel wool or sandpaper to
remove rust. Clean the surfaces thoroughly with a cloth
saturated in mineral spirits or turpentine. Prime bare
metal and allow it to dry thoroughly.
On new metal sashes, you should wipe the sash
thoroughly with a cloth saturated in mineral spirits or
turpentine to remove dust, dirt, oil, or grease. Remove
any rust with steel wool or sandpaper. If the sash is not
already factory-primed, prime it with rust-inhibitive
paint and allow it to dry thoroughly.
GLAZING
“Glazing” refers to the installation of glass in
prepared openings of windows, doors, partitions, and
curtain walls. Glass may be held in place with glazier’s
points, spring clips, or flexible glazing beads. Glass is
kept from contact with the frame with various types of
shims. Putty, sealants, or various types of caulking
compounds are applied to make
between the glass and the frame.
Wood Sash
a weathertight joint
Most wood sash is face-glazed. The glass is
installed in rabbets, consisting of L-shaped recesses cut
Figure 4-29.-Types of wood-sash glazing.
into the sash or frame to receive and support panes of
glass. The glass is held tightly against the frame by
glazier’s points. The rabbet is then filled with putty. The
putty is pressed firmly against the glass and beveled
back against the wood frame with a putty knife. A
priming paint is essential in glazing wood sash. The
priming seals the pores of the wood, preventing the loss
of oil from the putty. Wood frames are usually glazed
from the outside (fig. 4-29).
As we noted earlier, wood-sash putty is generally
made with linseed oil and a pigment. Some putties
contain soybean oil as a drying agent. Putty should not
be painted until it is thoroughly set. A bead of putty or
glazing compound is applied between the glass and the
frame as a bedding. The bedding is usually applied to
the frame before the glass is set. Back puttying is then
used to force putty into spaces that may have been left
between the frame and the glass.
Metal Windows and Doors
Glass set in metal frames must be prevented from
making contact with metal. This may be accomplished
by first applying a setting bed of metal-sash putty or
glazing compound. Metal-sash putty differs from
wood-sash putty in that it is formulated to adhere to a
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