Our cut & material lists always call out the nominal size. Just part of the lumber biz that you quickly learn to accept. The real-world measured size is what you really get. You’ll never hear a framing carpenter say “pass me another one and a half by three and a half”. When referring to a specific piece of lumber, the nominal size is always used. A nominal 2*4 can have a minimum real/typical size of 1.5″ x 3.5″. Refers to minimum acceptable size after it has been dried, dressed, and seasoned. This is what you will see in the plan parts descriptions. It is used to name a particular size piece of lumber, such as 2×4, 2×6, etc. Basically, it’s a commercial “trade name” used in name only for identification purposes. This is the size of a piece of lumber before it is dressed and seasoned. Be assured, our plans use real finished sizes. Commercially manufactured, kiln-dried construction lumber is finish-sized. Rough cut two by fours are usually the real 2″x 4″ in size. The charts below and right will help you understand both lumber dimensions and factional/decimal equivalents. Plywood, paneling, and specialty lumber just use the real dimension as both its call-out name and real finished size so 3/4 plywood is really 3/4″ or. This follows for most all lumber call-out names vs. Quick Example:Ī common 2×4 construction stud (referred to as a “two by four”) is actually 1.5″ x 3.5″. Dried typical lumber size is always slightly smaller, but always by a standard difference. The Nominal Size is what you ask for, the Typical Size is what you get.
So you bought your plans and see that a 2×4 stud is listed as 1.5″ x 3.5″….what’s up with that? Dimensional Lumber:ĭimensional lumber sizes are called out in standardized dimensions of width and depth.
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