I suggest you get the security company who monitors the system to repair it. They can tell you whether the electricians caused the damage. If so, send the bill to the electricians. In general, they sh ... read more
This is a spot where cracks often develop. After cleaning with a a mildewcide, check carefully for a crack. If the grout is cracked, open the crack up a little wider with a grout saw (inexpensive at a ... read more