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I know its hard to tell see in the pic but the best way I've found to waterproof the curb is to build the curb out of treated lumber, wrap it with the shower membrane, install
the dura rock/hardibacker, waterproof then stick another layer of 1/4" dura rock on the top with thinset . Slope the top layer back to the shower with thinset and DO NOT SCREW IT DOWN then waterproof it again .