Grout can be rubbed away on natual stone facade on front of house

rh-keith

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We looking at buying a 5year old house that has a natural stone facade to the front of the house. If you rub your finger against the grout it feels 'sandy' and rubs away. To an extent, is this normal for the grout finish?
 
This wouldn't be too unusual, as long as its just a sandy dusting on the mortar. If it comes away easily deep into the joint, I'd be worried.
 
some builders use a very dry mix for pointing so as not to stain the stone,probably a bit too dry in your case, sealing will solve the problem
 
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