By George H. DuBose, CGC; Steven R. Gleason, P.E.; and Charles Allen, Jr., AIA

While it’s accurate that truth can certainly be stranger than fiction, it is equally strange that so many in the design and construction industry perceive myths as truth, especially after they have been disproved as false time and time again.

In our work resolving mold and moisture problems in hotels and resorts, Liberty Building Forensics Group (LBFG) experts have discovered certain faulty beliefs surrounding hotel performance in coastal zones that are leading to building failures which are often catastrophic in scope. Below is one such myth related to waterproofing, followed by an explanation of why it is false as well as a first-hand case study supporting this position.

Figure 1
Figure 1: Despite the presence of a waterproofing membrane on the elevated concrete slabs, water intrusion occurred through the terrace levels into the spaces below, infiltrating via penetrations and cracks in the slab.

Myth – Water damage can be avoided in hotel design as long as some type of waterproofing membrane is installed over a concrete slab.

Truth – Unfortunately, the issue is not as simple as that. In fact, many factors must be considered when waterproofing a concrete slab base. Using a waterproofing membrane over a concrete slab, which is often topped by a mortar bed and stone or similar overburden, is just the starting point.
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