The design of a below-grade waterproofing system entails more than just selecting a waterproof membrane. There are many aspects considered in the design process that can impact the system’s overall performance. Poorly performing systems lead to water entry, and in many instances there is no cost-effective way to access the waterproof membrane to perform repairs and positively stop the water intrusion. Since the design and installation of a below-grade waterproofing system is only cost-effective once, it is important to get the design correct with enough safeguards to ensure quality assurance during installation. This presentation will outline the design process and help architects, owners, developers, and contractors better understand the reasoning for certain design decisions.

Presenter:  Kenneth A. Klein, PE

Ken Klein leads the West Coast Building Technology division of Simpson Gumpertz & Heger, and is experienced in the design and investigation of waterproofing of commercial, institutional, and residential buildings. His work addresses issues related to the integrity of curtain walls, roofs, plaza deck, and below-grade systems on a wide-range of structures from residential and high-rise building to buildings of historic significance. Ken has consulted with architects, contractors, and building owners to analyze and repair water intrusion problems and construction defects. Well known in the industry, he has frequently presented to groups of attorneys, contractors, architects, and other design professional regarding building-envelope design and remediation.


The Building Enclosure Council (BEC) is a network of affiliated architects, engineers, contractors, manufacturers and others located in major cities across the United States. The Dallas BEC was formed to address durability, de- sign and the unique air, moisture and thermal performance challenges of building enclosures in Texas.



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