Just measured a 9,000 sq ft. Law office that had their carpet cleaned hwe style about 3 months ago. They said a few days after the cleaning 20 different areas of this commercial carpet Tiles started to come up. Company that cleaned it used hot water extraction and when they called to complain about the tiles coming up, the company went back and put down some sort of glue that seep through the backing to the edges. As you can see in the picture below. I did not want to provide the customer with wrong information (even though I would have loved to describe why not to HWE) about why this could happen, so I am asking you... this happened because of improper installation of the carpet tile, or too hot of water used, or water left sitting in the carpet? It is in about 18 different spots where the tiles are coming up, the offices look fine, this is basically mainly in the hallways. I took some gel break with citrus solv and some host compound and razed blade, the glue came up. We just did it in one test spot.