Page 293 - Construction Waterproofing Handbook

SEALANTS 5.51

FIGURE 5.54 Design of typical structural glazing joint. (Courtesy of Dow Corning)

Bite (inches) 2 (smallest leg of the largest single piece of glass, length or width)
1
expected windloading in lb/sf / Sealant design strength 12 in/ft
Thus, an 8-ft-by-16-ft piece of glass with a 60 lb/sf, using a sealant with a design
2
strength of 20 lb/in , requires a 1-in bite. Whenever a fraction of inch results an appro-
priate safety factor is added by rounding up the required bite to the next 8 in.
1
Glazing requires that all proper sealant application techniques described previously in
this chapter be used when applying glazing materials in both structural and nonstructural
joints. Most silicone glazing materials are moisture- or air-cured and therefore require the
use of open- or dual-cell backing materials. In all structural applications, provisions must
be made to permit the sealant to cure before applying the nonstructural glazing joints that
can prevent exposure to air for curing.
Glazing also is used to seal the glass panes into the curtain wall or window frames to
prevent air and water infiltration. Typical recommended detailing for nonstructural glazing
is shown in Figs. 5.55, 5.56, and 5.57.

FIGURE 5.55 Typical butt joint glazing. (Courtesy of Dow
Corning)