1.1 This terminology consists of terms and definitions pertaining to railing systems and rails for buildings, and in particular, terms related to the standards generated by ASTM Committee E-6 on Performance of Building Constructions.

1.2 The purpose of this terminology is to provide meanings and explanations of technical terms, written for both the technical expert and the non-expert user.

1.3 This terminology is one of a group of special terminologies subsidiary to the comprehensive Terminology E631.

1.4 Terms are listed in alphabetical sequence. Compound terms appear in the natural spoken order. Where definitions herein are adopted from other sources, they are exact copies. The source is identified at the right margin following the definition and is listed in Section 2.