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Residential Resurrections

I have installed both. I'm an independent contractor, so I have no extraordinary bias for either (except the linear drain and no curb will make me more profit. It needs significant attention to planning and execution)

AFA slope, recommended slope for both types is the same 1/4 inch per foot. Of more significance is the need to use slip resistant tile and sanded grout.

A center drain has an advantage in that smaller tiles (and therefore, a higher percentage of area is grout) must be used due to the bowl nature of the drain plane.

Linear drains allow the use of a single drain plane, which therefore will allow the use of large format tiles. With less grout (which acts as little traction bars), it is important that the tile has a 0.6 COF (Coefficient Of Friction rating of .6 or more). Honed natural stone (like marble/granite) are problematic when wet.

Spray on coatings are now available to improve traction. Search for "tile slip coatings". One vendor cited 3 years of duration. YMMV

CTIOA slope report

HD Tile/stone slip coatings

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Absolutely love our curbless shower!
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That is beautiful!

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