I saw a display in Ikea that did just that. I think if both were reinforced and bolted directly into the wall studs, and nothing too heavy (your entire library) were placed on the shelves that you have nothing to worry about.
yup, was thinking of doing some ladder thing. maybe a commercial grade fiberglass ladder and rig up some sort of track thing.
got some of the bookshelves yesterday, and next issue i need to figure out is how to put one on top of the other. they are pretty heavy (about 150lbs?), so might need to get 4 strong friends or rig up a pulley system connected to a beam in the ceiling…
did think of that. but how the ikea ones go together i dont think it would really work as you need to put in a row of verticals then a hortizontal, then another row of verticals, the verticals wont stay in place by themselves (damn gravity).
I helped a friend put one of these together last year, and they are not designed to be moved once assembled, other than some gentle shuffling around on the floor. Trying to hoist one fully assembled would probably end in tears and lots of shredded particle board – the corner connections are not designed to take much tension or rotation, and the unit gains most of its lateral stability from the cross-pieces.
I’d suggest building the second one in-place atop the first, tying the two main verticals to the wall as you go. Brackets about 2/3 of the way up should be about right. Probably wise to tie the lower unit to the wall near the top too, in case the extra load makes it rack sideways.
I put one together last year. You can’t move them with stuff on them, but a fresh one just built could be easily lifted by two people and placed carefully where you want it. The outside thick supports are laminated honeycomb, the thin sections are laminated partcle board.
If you’re really ambitious, you could attach solid wooden reinforcements on the back side, say 2-3 cm thick x however thick the main supports are, joining the two together. This would be done when both units are completed but still lying face down on the floor, and then tip the whole thing up into place.
Also, maybe you could try the thicker shelves with 4 openings in a row (lack?) and stack them horizontally instead. Or maybe a couple in conjunction with expedit?
I think it just depends how much hacking you’re willing to do. And like I said, I saw it done in a store display.