Finish TradesQuestion 231 of 700
When setting translucent or moisture-sensitive natural stone (such as certain marbles), a WHITE, non-staining setting mortar is preferred over a gray latex thinset MAINLY because:
a.White mortar cures faster in all conditions
b.Gray mortar has no bonding strength
c.White mortar eliminates the need for sealing the stone
d.Gray or moisture-carrying mortar can show through translucent stone or cause staining/discoloration
Explanation
Light-colored and translucent stones can telegraph the dark color of gray mortar and are prone to staining from mortar moisture and pigments, so a white, low-moisture (often rapid-set) mortar is used. Cure speed, bonding, and the need to seal the stone are separate considerations.
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