Hope someone can give me some direction. Philadelphia recently adopted boca 2006 building code. I'm currently plumbing a six story, six unit building with stacked typical laundry/hot water heater rooms. The overflow pans are not part of our plumbing code. I have no problems with the pan requirement I think it a good idea. I installed a 1" riser picking up all 12 pans, 6 hwh 6 washers. The inspector said that 1" is to small and I need to size the riser as if it were a drain. All I can find in the building code is a miniumum 3/4" requirement but it kind of refers to a single pan. In my neck of the woods, any thing over a three unit building requires cast-iron and copper, so it's not a cheap fix. I don't mind calling him on it if there is nothing in the code to say he is correct. It's probably as new to him as it is to me. Sounds like alot of you guy's deal with the ipc codes hope someone can help.