HOA Waterproofing Challenges for Construction Management
The existing deck coating system is comprised of a layer of elastomeric-type coating on the original structural concrete slab, topped with an aggregate mixture commonly called “epoxy rock” At some later time, the epoxy rock was coated with another material, a thin waterproofing membrane or “paint” of some kind, in an apparent effort to extend the life expectancy of the system or improve appearance. This combination of elastomeric waterproofing with a cementitious topcoat is quite a good system in that the elastomeric will elongate to span cracks and allow for movement while the cementitious system is very durable and protects the waterproofing from pedestrian traffic and UV rays. There are numerous cracks in the existing coating, which are either radiating from the structural slab in some cases, particularly at cold joints, or are hairline cracks in the epoxy rock membrane itself.
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