2 0 1 3 P R O D U C T G U I D E VIRACON PRODUCT GUIDE 2013 ...
2 0 1 3 P R O D U C T G U I D E VIRACON PRODUCT GUIDE 2013 ...
2 0 1 3 P R O D U C T G U I D E VIRACON PRODUCT GUIDE 2013 ...
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glazing guidelines<br />
Glazing guidelines<br />
Viracon specifies that 100% silicone setting blocks be used for all types of glazing systems. The blocks should have a Shore-A<br />
durometer hardness of 85 ±5. They should also be centered at quarter points and be 1/16” (1.6 mm) less than the channel width<br />
(See Figure 1). For additional recommendations, contact the appropriate gasket or framing manufacturer.<br />
Viracon specifies that edge blocks or anti-walk blocks be used for dry glazed systems. Viracon also specifies that edge blocks<br />
be silicone and have a Shore-A Durometer hardness of 60 ±5 and be a minimum of 4” in length. They should be installed in<br />
the vertical channel with a 1/8” (3mm) clearance between glass edge and block. This will limit lateral movement of the glass.<br />
Inadequate edge clearances can cause glass breakage as a result of glass-to-frame contact. For recommended face and<br />
minimum edge clearances, as well as minimum glass bites, (See Figure 2).<br />
WEEP SYSTEM<br />
The edges of laminated, insulating, and spandrel glass<br />
should not be exposed to water or moisture vapor for<br />
extended periods of time. Exposure of the glass to moisture<br />
vapor or liquid water for extended periods will ultimately<br />
result in seal failure, coating deterioration, sealant<br />
deterioration, or de-lamination. Viracon requires either<br />
a positive weather seal, or an adequate weep system to<br />
prevent this occurrence (See Figure 3). The effectiveness of<br />
the weep system or weather seal depends on the design,<br />
workmanship, engineering, and mock-up verification testing<br />
completed by the glazing manufacturer, installer, or designer.<br />
Responsibility for the weep system and its performance is<br />
the responsibility of those parties or others, and is not the<br />
responsibility of Viracon.<br />
Weep<br />
System<br />
FAce<br />
Figure 1<br />
Setting<br />
Blocks<br />
Structural silicone glazing<br />
Structural silicone glazing uses silicone sealants with an<br />
interior backup mullion. It must be specified as a structural<br />
silicone glazing system due to compatibility limitations of<br />
silicone sealants with certain types of glass or insulating<br />
unit secondary seal designs. To obtain approval for any<br />
structural silicone glazing system, contact the appropriate<br />
silicone manufacturer or the Technical Services Department<br />
at Viracon.<br />
Bite<br />
EDGE<br />
closed-cell<br />
neoprene<br />
gasket<br />
Figure 2<br />
dense<br />
wedge<br />
gasket<br />
Weep<br />
Figure 3<br />
126<br />
<strong>VIRACON</strong> // RESOURCES