by 
The Curious Bag
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A shower pan forms the floor of a walk-in shower. The drain sits at the lowest point of the pan, usually the center, and the edges are raised to prevent water from spilling out.
Types
Prefabricated shower pans are available in standard sizes at home-improvement stores and from online retailers. Custom shower pans can be built on-site.
Prefabricated Pans
Acrylic prefabricated shower pans are the most inexpensive--and the most common. Pans made of other materials, such as enameled steel, are available, or you can purchase "tile ready" prefab pans, which provide a backing for ceramic tile.
Prefab Pros and Cons
Since they come in one solid piece, prefab pans won't leak unless they are badly damaged. Your choices of sizes, materials and finishes are more limited, though.
Custom Pans
Any material that can be made watertight can be used for a shower pan. Popular options include poured concrete and granite, marble or ceramic tile.
Custom Pros and Cons
Custom pans give a bath a high-end look, and options are nearly limitless. Careful construction is vital, however, because even a small leak can lead to major structural damage.
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