I want to build a custom sized shower using tiles for the pan.
I do not knowthe procedure but assume there has to be some type of waterproofing membrane beneath the tile. Any help appreciated.

Jshafran

See this link:

How to Build a Shower Pan

I don't want to sound like a downer but this is no small task for a first timer. Amricca has given you the best link I have ever found for a custom pan. I might suggest you consider a Swanstone fiber glass readi-made shower pan for about $250. Swanstone Single Threshold Shower Floor

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Originally Posted by amricca

See this link:

How to Build a Shower Pan

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Appreciate your help. Sopunds like work for a pro!

It is not a simple task, you should consider a pre-fab pan like ballenger suggests. They are easy to install and look good.