Before purchasing my house, I hired a home inspector who identified loose tile in the shower. The contractor the seller’s realtor sent out said “I doubt it will be a problem” and regrouted and caulked the area. After two months in the house, we pulled off a loose tile and found the sheet rock behind it was deteriorated. Needless to say, I have gone back to the contractors employer to complain. I would like to know where I can find documentation that loose tile is indicative of a definite moisture problem in the wall board behind it, such as a plumbing manual or codebook. Thank you.