Unlike the roof of a building, which is only exposed to weathering and the elements, plaza decks have numerous special features supplemental to their common waterproofing characteristic. This section provides specific description of materials and systems common in plaza decks.Ī plaza deck system is any supported slab that provides green-scape, tree planters, and/or vehicle and pedestrian movement over occupied space. Other common causes of plaza deck deterioration or failure are: severe exposure (including freeze thaw), chemical applications, overload, and/or improper materials selection and application.Įach of the above categories (listed features) is capable of working independently or in concert with other elements to cause premature plaza deck surface or waterproofing distress (service impairment) or subsequent damage over years of use exposure and traffic. Plaza deck systems generally disintegrate and become unserviceable for three reasons: Accordingly, special analysis of plaza decks aesthetic, wearing, moisture protection and isolation, and structural support systems, should be performed. Harsh exposure conditions from exposure, moisture, thermal effects, weathering, and traffic often reduce these systems serviceability at a rate even surpassing that of parking and bridge deck slabs. Plaza decks are subject to some of the most accelerated and vigorous deterioration and distress of any structural system. Design of plaza deck surfaces, green-scape and tree or soil planter features above buried elements requires special design consideration. Requirements for overhead waterproofing in tunnels or building obtrusions are significant and need to be treated accordingly. Protection, drainage and isolation along with thermal considerations must be incorporated into the design. Although much more complex and far more maintenance intensive, these features are generally not treated with the same detailing attention that roof assemblies receive. The planning, development, detailing and construction of waterproofing for such features are significant. Buildings frequently have plaza decks below grade.
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