Installation Guide

15
If mechanical fasteners must be used, allow room
for expansion and contraction. A method of attach-
ment to prevent acrylic sign faces from binding on
the sign cabinet include a spacer, slightly taller than
the thickness of the acrylic sheet and the sign cabinet
combined, inserted through the oversized hole and
slot (See Fig. 26).
Tie bars are typically used on large signs to pre-
vent the acrylic pan from blowing in, out, or dislodg-
ing. They attach the sign face to the cabinet (See
Fig. 27). Soft bumpers can also be used to minimize
sign faces from flexing inward. Contact between the
sign face and the bumper can cause friction, thereby
damaging graphics. Both methods work best on
signs decorated on the first surface.
VENTILATION
To prevent sign face distortion caused by heat
build up above the acrylic deflection temperature,
cabinet ventilation should be incorporated. Consider
additional vents when the sign face is decorated with
dark paints or vinyl (See Fig. 28).
CEMENTING TRIM CAP
Tack trim cap to acrylic with a water thin solvent
such as Weld-On #3. Allow to dry, then apply a con-
tinuous bead of thickened polymerized cement such
as Weld-On #16 (See Fig. 29).
Figure 25
Figure 26
Figure 28
Figure 29
Figure 27