I have two box newel posts to install on a straight run on the main floor. The ceiling below is all finished.The floor that the railing goes on is a laminate wood floor. The floor framing consists of clear span floor trusses with 1-1/2 inch top cord - not enough to fasten anything to. Short of tearing up the floor or ceiling below, does anyone have any ideas on fastening these and making them solid?
(Cabinet and Millwork Installation Forum)
From contributor A:
I guess if the box newels are hollow, I would take a solid block of wood that fits tightly inside the box at least 4 inches up and screw the heck out of it to whatever I could find under the floor. Then fasten the box newel to the block - assuming you could screw that block to the top cords of the truss. If you only hit subfloor you may get too much flex in the subfloor. The other idea that comes to mind is to use a giant Molly bolt - those butterfly bolts that you typically stick thru the drywall and the wings pop open - usually used for hanging lightweight things in drywall but the same principle. If you could find a big enough one you would have to fill in the bottom of the posts and drill a brass insert to thread the Molly bolt into. Then drill a hole in the floor to insert the Molly and turn the post until it's snug enough. But you will still get flex from the subfloor. If this is a railing it supposes that it is near an opening in the floor. Usually the joists are doubled around openings to reduce sag and flex. If that's the case you may be able to hit two joists (trusses) and then you'll be solid. Do you have any old prints from the house? If it's laminate and you're near the edge you might better just take up a few strips of the laminate. Just whose idea was it to lay the laminate before figuring out the newel posts?