What is the maximum allowable span for a piece of 3/4 plywood used for flooring? Shelf depth for a general purpose bookshelf is usually 10 to 12 inches. 4 TABLE 3 UNIFORM LOADS (PSF) ON GROUP 1 SANDED PLYWOOD PANELS MULTI-SPAN, NORMAL DURATION OF LOAD, DRY CONDITIONS Face Grain Parallel to Supports Thickness Load Face Grain Across Supports Span, Center-to-Center (inches) Governed Span, Center-to-Center of Supports (inches) of Supports (inches) By 12 16 19.2 24 30 32 36 40 48 60 12 16 24 (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. For most shelves made from 3/4 inch stock, a practical span is 30 to 36 inches. So a three-foot shelf filled with average sized books would have to support 60 pounds. The longest recommended span between wall supports for 5/8-inch particleboard is 24 inches. This variation in recommendations is probably due to the tendency to use particleboard and MDF for more finished shelving and plywood for more utilitarian shelving where a slight visual deflection will be tolerated. But that is just a guess. Re: How Far Can You Span 3/4" Laminate Boards? How do two people sleep in a space four feet square? Table 3 capacities may be adjusted for panel type using Table 4. These are all going to be painted. Shelf depth is determined by the size of the items to be stored, generally within the range of 6 to 24 inches. solid wood is strongest, plywood next, and pressed boards last for sag. 3. Set the shelf on the brackets and screw it down from beneath. 3. I have an older DFPA publication that shows, 3/4" T&G or with ply clips, can span 39" @ 50#/sf roof load. A thicker back with a dado would also help a lot. I usually use a 1-1/2″ strip on a 3/4″ plywood shelf. The shelves will be either be faced with a 3/4" piece of solid wood or veneer so not much support from the facing. Many bookshelves have a depth of 8″ to 12″, a width of 24″ to 36″, and a thickness of 3/4″ to 1″. M9.2.1 – M9.2.4 for the appropriate multipliers for Structural I panels. good tables in some of the fine homebuilding mags somewhere. It is commonly sold in thicknesses of 3/8 inch, 1/2 inch, 5/8 inch, and 3/4 inch. If you could be assured that you could get the same bonding from nailing / screwing and gluing the panels together as the panel manufacture, then the answer would be yes. By "cabinet grade" I assume you mean pine plywood with a veneer of oak or birch for the outside layers. The plywood people base their calculations on 3/16" deflection in a 36" span (1/180). Adding a 3/4" edge of solid wood will improve the strength of the plywood (or MDF or particleboard) considerably and make it almost as strong as solid wood, especially if it is 3/4" by 1 1/2", but hardwood is still stronger. The third factor used to determine maximum span is the type of material used -- particle board, plywood, solid wood. They will be only supported on the ends.
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