Related Topics. Once, however, the pieces are put together, the dimension tags for the individual pieces no longer apply. Keith Mealy May 23, Q: Then how thick is a 1-by-4? The third dimension tall height does not have that nicety. See the ICDT manual for an explanation of that bugbear. Oy vey.
In North America, hardwood lumber is usually specified using the quarter system, where a board is identified by its thickness in quarters of an inch. For instance, hardwood trim that ends up being just over 1" thick (surfaced on 2 sides) is called a five-quarter (5/4) board. Hardwood board widths vary. Become a better woodworker with these projects, tips and ideas for building furniture, cabinets and all woodworking projects. Lumber sizes are usually given in “nominal” measurements. The nominal measurements are a board’s size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size. If your project calls for precise measurements, be sure to check your lumber before purchasing.

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