Reply by Charlie

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Posted on Wall unit bookshelf Shelving question - Warping walnut ???

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1100 posts in 2285 days

#1 posted 04-23-2013 10:13 AM

Fixed shelves sag less than floating shelves.
At 1 full inch thickness, and assuming 12 inches deep, a 48 inch shelf may sag noticeably. The 36 inch span shelves should be ok.

There is a shelf sag calculator here

I use about 10 pounds per linear foot for bookshelf loading. Depending on the books, this number might be higher, but in most cases it’s fine.

The solid walnut is much better on the long span than plywood. Even plywood with an edge attached doesn’t come close.

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