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Unread 11-22-2020, 07:47 PM   #9
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,225
Some slate is very dense and solid. Some called slate is little more than compressed silt. The multi-colored stuff is often junk. The real stuff that is fine grained can be pretty solid. Still, could be an issue in a shower.

Real slate is a metamorphic stone. Heat and compression 'fires' it sort of like what happens with a ceramic tile. THe 'fake' slates are little more than fine-grained sandstone that can turn to mud if soaked and often has little abrasion strength.
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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