Recently saw a similar setup on Home & Garden network. There was a rail
that was bolted to the wall with rods sticking out that seated into the back
of the shelf/mantel. Depending on how you plan to design it you could just
use the method where you cut a 2x4 down the center at a 45 (2x6) might be to
your liking for heaver stuff) and cut at a 45 deg. angle. The two interlock
and the weight downwards keeps the piece against the other that is fixed to
the wall.. Notch cut into bottom allow for screws to be run up and join the
two. Not sure what weight it would hold but you get the idea. I think metal
"L" railings would probably work the same way. With one being recessed into
the back of the shelp piece. so the the top is anchored while the bottom
rests against the wall. Lagg bolted should do the trick.
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