9.13.3.1. Required Waterproofing
Where #hydrostatic pressure occurs, assemblies separating interior space from the ground must be #waterproofed. #Roofs of underground structures must also be waterproofed.
Hydrostatic pressure occurs when the #groundwater table rises above building assemblies. #Drainage systems, which are required around the base of #footings, eliminate hydrostatic pressure on the assemblies above as long as the footings are below the water table. However, footing drains can become ineffective if they are blocked or have an inadequate capacity. Certain sites tend to be wet and poorly drained because of #topography or soil conditions; as a result, when #snow melts or during periods of heavy rain, below-grade spaces may be subjected to hydrostatic pressure. #Walls and #floors subject to hydrostatic pressure from a high water table must be designed to resist such pressure.
Quoted from Illustrated Users' Guide - NBC2015
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