Specifying Appearance for CLT, NLT and Glulam

A primer for designers seeking to specify appearance for cross-laminated timber (CLT), nail-laminated timber (NLT), and glue-laminated timber (glulam). Covers appearance classification systems including architectural and industrial categories for CLT per ANSI/APA PRG 320 standards, specification approaches for DLT and NLT using project specifications, and standardized glulam appearance classifications (Premium, Architectural, Industrial, Framing). Addresses differences between North American and European appearance terminology, surface characteristics specification, lumber grades, and coordination between end-users and manufacturers. Includes practical guidance on specification language, acceptable aesthetic characteristics, and manufacturer coordination processes.