It is also used for building things like work benches, potting tables, benches, and planter and window boxes. Dimension lumber can be purchased as dry or green. Voluntary Product Standard PS 20-05, American Softwood Lumber Standard. Mechanical Tolerance Variations of Lumber: Per. It is typically used for floor joists, deck joists, beams, arbors, fences, roof rafters, stair stringers, wall framing, decking, and posts. The following data is standard reference and size data for commercially available lumber within the USA. Dimensional lumber is usually produced from softwoods, such as spruce, pine, fir, cedar, and redwood. If only two sides are planed, it is denoted as S2S. Typically, the lumber in the store or lumber yard is planed (dressed) on all four sides and is denoted as S4S. When building a project, one needs to know there is a difference between the nominal and the actual sizes of lumber. Nominal and actual sizes of lumber are construction standards in the building industry. It is stilled referred to by its nominal size, such as the 2×4, but its actual size is now 1 1/2” by 3 1/2″. The following data is standard reference and size data for commercially available lumber within the USA. After it is planed, the piece of lumber no longer has its nominal dimensions, for it has been reduced in size. This processing of the lumber produces the dimensional lumber that you see at the stores and the lumber yards. Rough sawn lumber has a very rustic appearance, which is a desirable look for some projects.įurther processing at the mill involves putting the lumber through a planer to get the smooth, also called ‘dressed’, surfaces. At this point in the milling process, the lumber would be referred to as rough sawn lumber (there may even be some bark still on it) and its measurements would really be 2” by 4”. The difference in the size comes from when the timber logs (tree trunks with the branches removed) are sent to a lumber mill where they are first cut into standard sizes, like the 2×4.
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