35 mph over a rocky tundra, but .02mph over a slight rise!
Codes is most areas are very vague about materials to be used for pipes but instead only specify diameter sizes to be used for supply and drain. Even in today's codes you'll likely not see a material specification for pipe as there are so many variations now on the market and copper is getting priced out of the range for most buyers. In different parts of the country copper and steel pipe was used interchangeably through the 50s and 60s with copper taking over in the early 70s and staying strong until about 10 years ago with the advent of the flexible PVC tubing and quick-connect fittings and the insane price increases in the cost of copper.
Being barefoot is not a fire hazard, but it does make it more difficult for you to get out of the building quickly and safely in the event of a fire or other emergency. If there is a fire, you're not supposed to stop for anything and that includes putting on shoes. That then puts you at greater risk of injury both inside (do you really want a third degree burn on your foot?) and outside, where you could step on glass or nails.
