Usually there has very high compressive strength and the stones mean if you squeeze it, it will not Blow expansion of the Cracked Marble Flooring ,especially if it is to stick to directly to the wood,it can pull the marble apart.Wooden floor structure may also be a contributed factor. If the floor is stiff, elastic and not a slight movement up and down, a trampoline that can cause strain of crack.A marble installer can usually also make some mistakes.These memberance in the marble floor floating on the top of subfloor and the sideway can transfer the marble flooring inthe forces from pulling apart from the marble.Marble flooring is naturally has beautiful veins for repairing the cracks.When applying the float grout and the excess on the grout off the marble for a slight on the marble.