What's under shower pan?

Southern California coast house on slab. is there anything under the plastic pan?
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I've seen many basement bathrooms being installed and usually its the concrete slab. The pan is usually secured by the drain assembly and maybe even some adhesive like liquid nail.
There comes a time in the affairs of man when he must take the bull by the tail and face the situation. -- WCF http://www.utahhousevalues.com
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I'd hope it's built up on concrete.
www.oatey.com/apps/catalog/instance_assets/assets/Shower%20Pan%20Liner.pdf
RB
snipped-for-privacy@vcoms.net wrote:

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