Folks, I'm new to the forum, so forgive me if I've got the wrong category. I have a smal '60s brick ranch with a raised foundation. The full and 1/2 bathroom are back to back. The full has started showing cracks in the tile as though the tub is sinking. Now the half is staring to gape between the shower walls and base. I've checked under the house but do not see evidence of water damage or foundation damage. At this point, I just want to know "who to call" that can help me with a valid diagnosis.