Home Improvement Chains Accused of False Advertising Over Lumber Dimensions (consumerist.com)
per unit analyzer writes: According to Consumerist, an attorney has filed a class-action lawsuit charging Home Depot (PDF) and Menards (PDF) with deceptive advertising practices by selling "lumber products that were falsely advertised and labeled as having product dimensions that were not the actual dimensions of the products sold." Now granted, this may be news to the novice DIYer, but overall most folks who are purchasing lumber at home improvement stores know that the so-called trade sizes don't match the actual dimensions of the lumber. Do retailers need to educate naive consumers about every aspect of the items they sell? (Especially industry quirks such as this...) Furthermore, as the article notes, it's hard to see how the plaintiffs have been damaged when these building materials are compatible with the construction of the purchaser's existing buildings. i.e., An "actual" 2x4 would not fit in a wall previously built with standard 2x4s -- selling the something as advertised would actually cause the purchaser more trouble in many cases.
If you buy a 20GB hard drive, you might only get one with 19GB of free space.
If you were qualified to make a plan you'd know the actual dimensions of lumber.
These dimensions have been industry standards for 60 years or more (just addressing my own lifetime in that). All contractors know it, all architects know it. Anyone who works with lumber knows it. Those qualified to make plans, like architects, allow for the accepted sizes in their plans.
If you are actually expecting a 2x4 to be 2" x 4", then that tells us, right off, you have no idea what you're doing.