Below-grade waterproofing in new construction is a critical yet intricate aspect of building design, essential for ensuring structural integrity and long-term durability. Key topics will include an analysis of why waterproofing is essential for below-grade structures, exploring how moisture intrusion impacts building longevity, air quality, and foundational stability. Attendees will be introduced to general waterproofing methods and materials, gaining insights into the practical applications, benefits, and limitations of systems including sheet membranes, fluid-applied membranes, and bentonite-based technologies.
This presentation will address the complexities involved in installing below-grade waterproofing systems, with a focus on effective interfacing with concrete substrates, specific pre-application considerations for shotcrete foundations, and the coordination needed between trades for a successful installation. Special emphasis will be placed on the critical role of substrate preparation, including evaluating concrete conditions, addressing irregularities, and ensuring compatibility with shotcrete surfaces, which present unique challenges due to their rough texture and potential inconsistencies.
This session will also cover logistical and sequencing challenges inherent to below-grade waterproofing, where timing is crucial to coordinate with concrete pours, rebar installation, and the work of multiple trades operating in confined spaces. Practical approaches with discussion on the best management practices for tying in the below-grade system to the above-grade system(s). Through a discussion on means and methods of waterproofing and best practices, this presentation will provide architects, engineers, and project managers with actionable insights to improve planning, prevent installation failures, and optimize below-grade waterproofing performance for long-lasting, resilient structures.

1. Analyze the Role and Importance of Below-Grade Waterproofing in Building Longevity.
2. Identify and Compare Common Waterproofing Materials and Techniques.
3. Examine Pre-Application and Surface Preparation Requirements for Concrete Substrates, Including Shotcrete Foundations.
4. Evaluate Installation Sequencing and Coordination Needs Across Multiple Trades in Below-Grade Waterproofing.