Building codes generally require tempered safety glass or laminated safety glass meeting CPSC 16 CFR 1201 Cat II or ANSI Z97.1 Class A. Minimum panel thickness and configuration will depend on the hardware system, post spacing, and application. Glass Vice USA can provide technical documentation to support your glazier or engineer in specifying the correct glass. we are one of the only companies with a product range ICC Certified without a top cap. other systems must have top caps installed when used as a railing.