My basement has a set of french doors that open up to a 6' wide walk-up into my backyard. Currently, the tops of the walk-up walls have cheap, builder-installed metal railings that basically look like garbage. They've started rusting and leaving nasty orange lines down both sides. My solution is to remove them and install PT wooden handrails and railings. I scoped out my neighborhood and found a newer home that had this exact set-up, so I snapped a few pictures for reference. My question is, based on the picture below, what type of fastener is being used to hold the 4x4 to the concrete wall? Obviosuly, it is some type of lag bolt with a large washer, but is it just "tapped" into the wall? If that's not the best solution, what would be?
Thanks in advance for your help. I'm hoping to tackle this project this weekend.
Keith