lumber storage system from Lee Valley.
https://www.leevalley.com/en-us/shop/hardware/storage-and-organization/systems/32145-lumber-storage-system?item=17K2001
I've had this system for a while.
works great and holds a lot of luber.
there are 5 - 55" vertical wall struts and 26 - 18" shelf brackets.
the whole system is going for $1000+
This shelving system is uniquely designed to make maximum use of space and has the tremendous advantage of being a front-loading system.
The wall straps 55", are hot-rolled steel with flanges 3/16" thick and corner sections over 1/4" thick.
The shelf adjustment holes are 1 1/2" apart.
Both the brackets and the wall straps are hot-dipped galvanized steel.
For good lumber storage, you should not space the wall straps more than 3' apart; 2' is ideal. A system for lumber up to 12' would therefore include a minimum of 5 wall straps, and as many brackets as you need.