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.
Roy