This deck was a disaster waiting to happen. The structural integrity of the hangers and fasteners was compromised.

The corrosion was severe. Robert even sent some of the rusted joist hanger nails. A few of them had lost well over 60 percent of the steel! The bottom of several hangers had holes in them ...

Pull out and replace rusted or corroded nails. Joist hangers used outdoors are usually attached with galvanized joist hanger nails, but you can also use screws if recommended by the manufacturer.