Hairline Fractured Stone Floor Tiles Help, advice, information, answers and tips on all types of flooring from laminate and carpet to timber and vinyl

[Cimarron]

Please advise,

I have stone floor tiles over gas underfloor heating.Some of the tiles,but not many,have begun to crack,mostly hairline.I wish to know whether it is necessary that I should replace them if the cracks are detrimental to the heating in anyway.

Many thanks,

Cimarron