SYSTEMS/MASONRY
Figure 4.2.18 shows a typical window jamb connection that suffers from thermal bridging and air
leakage. This wall contains an insulated stud wall inside of the masonry backup and has no air
barrier system. The cavity behind the veneer connects directly to the insulated stud space.
Thermal bridging occurs at the studs, the "truss" type brick ties and the window frame. An improved
design in shown in Figure 4.2.19. Rigid insulation is installed between the stud wall and the
backup, and this insulation is carried to the window frame thermal break. Compressible gasketing
is installed within the cavity to stop air movement from the cavity to the window frame. Also, "pintel"
type brick ties are used to reduce thermal bridging across the cavity.
UNACCEPTABLE
PLAN
Figure 4.2.18 Wall/Window Jamb
ACCEPTABLE
PLAN
isolate cavity
Interior drywall air
Thermally broken
window frame
Figure 4.2.19 Wall/Window Jamb
PAGE 4.2-22
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