What is the size of a 2x4 lumber?
At the lumberyard, board sizes are typically given in "nominal" dimensions, but those aren't the true sizes.For example, if three 2x4 boards are laid side by side, they won't measure a foot across.A 2x4 board is not really 1 inch by 3 inch.
2x4s are never used these days.A 2x4 board starts out at 1.56 in.x 3.58 in.After the edges are surfaced, the actual size is reduced to 1/2 in.x 3 in.
If boards are kiln dried, they start their lives at 1.62 in.x 3.68 in.They're dried in a kiln, then surfaced to an actual size.x 3 in.
For economic reasons, lumber sizing standards have changed over the past 100 years.
Standards differ for hardwoods and softwoods.Softwood and hardwood nominal dimensions are for thickness only.If the board has been planed on one side or the other, the actual thickness size will be different.
Some people wonder if it is legal to have nominal vs. actual dimensions.Yes, it is.According to the American Wood Council, the National Institute of Standards and Technology permits stores to label lumber with nominal dimensions as long as the label or other sign clearly states that the size given is a nominal size and also states the actual or minimum measurements.
When you head to the lumberyard to buy wood, make sure to take a tape measure.Before making a purchase, check the width and thickness.