In 2025, AWCI’s Technical Services Department remained engaged with the International Code Council (ICC) and UL Solutions (UL) to ensure our members are always well-informed. By staying closely aligned with the latest code developments and standard-setting activities, we provide the timely updates and technical insights our members need to operate with confidence.
Updated in March 2025, this Stucco and Drainage Planes technical document was prepared by the Lath and Plaster Committee of the AWCI Construction Technology Council.
This document provides information on model code language specific to the requirement for a drainage system or drainage material behind exterior cement plaster (“stucco”) cladding. The text reflects language found in the following:
Key initiatives tracked and influenced included updates to standards covering stucco drainage mats, firestop inspections, cold-formed steel, and gypsum products. Highlighting this commitment, AWCI’s Don Pilz was appointed co-chair of ASTM C1861 (Lathing and Furring Accessories), strengthening industry collaboration on design and application best practices.
Key focus areas include revisions to IBC Sections 1404.4 and 2510.6, which address stucco water management and drainage, fire-resistance-rated joint systems and penetrations, and the recognition of new firestop and cladding technologies within Chapter 7 of the International Building Code.
AWCI’s engagement ensures that proposed changes reflect real-world constructability and align with current ASTM and UL standards. Technical input was also provided to code committees reviewing requirements for cold-formed steel framing, gypsum sheathing, and EIFS assemblies, reinforcing AWCI’s commitment to maintaining consistency between standards, codes, and field practice.
AWCI ensured the contractor’s perspective was represented, helping to clarify performance expectations for the “drainage plane” and aligning practices with code standards (like IBC and ASTM E2556). This collaboration directly informed AWCI’s Stucco, Doing It Right® training and technical publications.
Through participation in IFC technical groups, AWCI contributed to initiatives related to UL 2079 joint listings and IBC Section 1705.17 special inspection protocols. This collaboration promotes standardized terminology and documentation among contractors, inspectors and designers.
This work directly supports the future development of Technical Manual 12-C (Standard Practice for Firestop Inspections) and the Joint Firestop Design Manual.