Hello. My wife and I have recently purchased a house in the Southwestern United
States. This house has interior flagstone floors in some of the rooms. We are
having a little trouble with crumbling grout between the stones. Does anyone
have any experience with the maintenance and care of interior flagstone floors?
The floors also have radiant heating. I notice the flagstone floors do not seem
to conduct the heat as well as some of the other floors (tile, concrete, brick).
I suspect there are air gaps between the stones and the heating coils. I have
discovered air gaps under locations where the grout has collapsed. Can anyone
recommend a good grout?
I would appreciate any guidance. These floors are all quite new to us.
I'm certainly no authority when it comes to interior flagstone floors,
but I've been passingly familiar with outdoor flagstone floors/patios,
which tend to be more harshly treated by the environment than their
indoor counterparts. Again, this is your basic knee-jerk stuff, so ...
First, when you say "flagstone," exactly what kind of stone are you
talking about? Limestone is different from granite is different from,
well, you get the idea. This might help others give you some reasonable
Second -- and this is only if I recall right -- it occurs to me that it
isn't *grout* that's filling in the spaces between the stones. Grout is
used on bathroom tile. You've got something else there, and I'm afraid
only either a mason or a good stone contractor familiar with indoor
stone floors/patios can ID what was used in yours and can offer a good,
long-lasting solution. Unless of course your house was owned by some
dope who was cheap and/or stupid enough to use bath tile grout. If that
was the case, you'll probably find yourself chieseling out all the bath
grout and resetting with a significantly better material.
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