Call for backup. Pipes in an attic, basement or crawl space tend to freeze first, and it's easy to look for them, but pipes can also freeze inside exterior walls. If you suspect your problem is in a wall, call a plumber. Fixing this problem may involve opening the wall and then fix...
If your building has gas fired appliances that lack an accessible gas shutoff valve you should ask a licensed professional plumber or heating technician to install one. Safety Recommendation: If you see that the local manual gas line shutoff valve at a gas-fired appliance has been installed ...