Home was built in the early 70s, ranch style, brick exterior.w/ covered front porch. The front porch is poured concrete in metel pans with broken red tile as finish.My guess is concrete is 2 inchs thick, Porch sits about 3.5 to 4 feet off the ground. Vents on both ends. Home is dry under home.The porch is hollow. porch size is 5x 25, there is not piers or supports in place other than the ledge from when it was origionally poured. The other day I went under house and went under porch area.I noticed the metel pans that was used to form the concrete is now rusting thru, some are completly gone.Most are in bad condition. I can see some exposed concrete as well. I need advice. Is this normal, is it safe. More important what should I do. I am sure contractors here will want a job and tell me the worst. Please advise.