Mounting the post through the floor is by far the strongest most durable and probably the best method but the difficulty is such that it is rarely if ever required.
How to install newel post to floor.
However attaching a newel post to a concrete floor is difficult.
When drilling post drill 1 1 2 hole first.
The ceiling below is all finished the floor that the railing goes on is a laminate wood floor.
Lag must be installed into solid bracing.
The floor framing consists of clear span floor trusses with 1 1 2 inch top cord not enough to fasten anything to.
Finally my personally recommended method of newel post installation unless you mount the post into the floor.
Step 1 cut your newel post to length.
Nonetheless the do it yourselfer with little or no experience can attach a newel to a concrete floor in less than one hour.
I have two box newel posts to install on a straight run on the main floor.
Diy basement finishing course.
So my personal favorite is the hanger bolt.
Locate the center of where your newel post will be installed on the floor and pre drill all holes figure a.