This shower pan did not have wood blocking around the base of the walls as described HERE. The contractor decided to prepare the backing for the hot mop with tin shingles. While this works, it is not ideal. This will make it a little more difficult for the tile setter to secure the tile backing. In addition, the pan structure will be more flimsy making it more susceptible to damage from construction traffic. When using sheet metal it is always best to use thicker gauge metals that do not give as easy. Everything else in this pan was prepared correctly. It had a properly secured water threshold (dam) and bolt-together drain.