I have a bridge in my backyard that spans a mid-size creek. Currently, there are posts reaching only ~18"-24" above the ground. I would like to add a railing to the bridge.
To attach a railing, can I extend the height of the posts by attaching 4x4s to the existing posts, and if so, what's the safest/sturdiest way to do this?
If not, what are some other options?