The best things to use to attach the joist hangers to the beam are structural screws or bolts. Never use roofing nails. I’ve seen people do this.

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

What about the beams that joist hangers are attached to, or the support posts? A: Joist hangers are safe, if they’re installed correctly.

Joists should also be fixed solidly at either end of the span on to the wall or a joist hanger and spaced at 400mm centres usually.