Noble makes a deck material rated for use over occupied space. https://www.noblecompanyonlinestore....rack-isolation
Flashing and connection to drains will be the harder part, but critical to an overall satisfactory job.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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