So Joe you saying slate is as impervious to absorbtion as granite?

If you are I'll have to respectfully disagree. And I'd never use slate outside in our vicious freeze cycle winters here. I can show you places here they did and regretted it.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.