I have seen this in travertine floor tile.
Too much water coming up through the floor. There is something in the fill
that reacts with the water and the one I saw looked the mushrooms growing in
in the floor.  I don't think they installed a vapor barrier.
This is a good one for Fred.
Hector Castillo

-----Original Message-----
From: list-manager@stoneandtilepros.simplelists.com
[mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Tony
Deluna
Sent: Thursday, August 18, 2016 12:22 PM
To: Stone And Tile Pros Link <sccpartners@stoneandtilepros.simplelists.com>
Subject: Limestone Spalling

Hey pros, does anyone know what causes the type of Spalling. It's only on
the floor at the shower wall tiles are all fine.

Visit list archives, subscribe, unsubscribe or change your subscription
preferences:
http://stoneandtilepros.simplelists.com/sccpartners

Start a new conversation (thread):
sccpartners@stoneandtilepros.simplelists.com