Horizontal surfaces exposed to the weather can be difficult to waterproof.
Inadequate slope can create areas of standing water.
In colder climates, freeze/thaw cycles impose additional challenges.
Frequently, the coating also has to stand up to foot traffic as well.
Most water-proofing materials are moisture activated polyurethanes, to provide a seamless and flexible coating.
The installation process typically includes a base and then a top coat, incorporating a granular non-slip material.