Oregon Zoo

Waterproof Concrete in the Northwest

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In Portland, Oregon, the Oregon Zoo elected to use waterproof concrete technology to create a new interactive salmon display. The entire building was cast-in-place waterproof concrete done without membranes or coatings, despite the fact that the roof is a part-water feature and part greenroof.

In addition, the walls of the building are half-submerged since they act as the pond in which the salmon are contained. Without a membrane to puncture, imbeds for the wire fencing were drilled directly into the roof of this structure, without worry of a leak.

Very large rocks were placed directly against the outside walls without any protection mats or devices. Other rocks are being created with a shotcrete carving mix containing the waterproofing system.

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