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Question about a custom built-in that failed after only a year
I built a floor-to-ceiling bookcase unit for a client in their den about 14 months ago, using what I thought was a solid method. I used pocket screws and glue for the main carcass, thinking it was plenty strong for a static load. Well, the client called me last week because the whole center section had sagged almost an inch under the weight of their books. I had to go back and add a full plywood back panel and some serious vertical supports to fix it. Everyone swears by pocket hole joinery for casework, but I think it's just not enough for something that tall carrying real weight. What's a better joinery method for a built-in like this that won't let me down?
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the_paul3d ago
Disagree completely. Pocket screws with glue are fine if you build it right. The problem was the missing back panel, not the joinery. A full sheet of plywood screwed and glued to the back acts like a big brace, it stops any racking or sagging. You built a tall box with no real support in the back, of course it folded. Next time, use the pocket screws for the case but always include that structural back.
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angelaw783d ago
My first bookshelf was a 2x4 and plywood monster I built in my garage. It was all pocket holes and no back, just like Paul said. That thing leaned like the Tower of Pisa after a week. I ended up screwing a piece of old siding to the back just to stop the wobble.
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