Contractors are highly aware of building codes -- especially those governing fire ratings and fire safety. Most of the materials they use and the type of construction they do are dictated by these strict rules and codes. But most homeowners aren't aware such codes exist. For instance, did you know if you have an attached garage that it also has a fire-rated wall separating it from the living quarters? It is specially constructed and fire-rated to provide crucial extra minutes in the event of a fire. However, if you make alterations, like adding an electrical outlet or two, you create penetrations through which fire can pass. In this situation, you are far better off installing new outlets and additional wiring ON the wall, rather than IN it. Instead of cutting new openings, use surface-mounted switches and outlets with surface-mounted wiring to a nearby professionally installed existing outlet. Garages are filled with flammable materials. Should fumes ignite, you'll be glad your firewall is secure and intact. And that's the On The House tip for today.