I'm hoping to install a 94" wide, 8" deep, 1/2" thick bookshelf made of poplar in a location surrounded by three walls.
Thanks to the three walls, it would be painless to support the shelf on boards attached to studs at both ends, and along the full length of the rear 94" edge.
Because the shelf will be in a "showy" area of my home, and because the underside of the shelf will be visible when coming up a staircase, I'm hoping to keep the installation tidy, without unnecessary brackets.
Because I'm matching an existing built-in "pedestal-top" shelf below, I want to stick with stained poplar, rather than a harder wood.
I don't have a good instinct for whether simply supporting the shelf along three edges will be enough to keep an 8"-deep poplar board from sagging over time, when fully loaded with books.
Any thoughts on whether three-edge support will be enough? Or might it call for a bracket or two for additional support?
Edit: I'm intending to securely attach the shelf to "rails" made of the same 1/2" poplar, which would in turn be securely attached to wall studs.