## What is a 2x8 dimension?

2x8. **1-1/2" x 7-1/4"** via

## Why is lumber not the actual size?

The "nominal" cross-section dimensions of a piece of lumber, such as 2 X 4 or 1 X 6, are always somewhat larger than the actual, or dressed, dimensions. The reason is **that dressed lumber has been surfaced or planed smooth on four sides (called S4S)**. The nominal measurement is made before the lumber is surfaced. via

## What are the actual dimensions of a 6x6?

The lumber industry defines standard wood post sizes as 4x4 or 6x6. The outside dimensions of the standard 4x4 measure 3-1/2" x 3-1/2", and the outside dimensions of the standard 6x6 measure **5-1/2" x 5-1/2"**. via

## Why are 2x4s not actually 2x4?

The simple reason why 2×4 is not 2 inches by 4 inches is **that lumber mills trim off rough or warped surfaces of a 2×4 to give it a more polished and finished look**. By planning the lumber on all four sides, the original 2×4 is now reduced to 1 ½ inches by 3 1/2 inches. via

## How wide is a 1x6 board?

The same is true of pine. A 1x6, for example, actually measures **3/4" x 5 1/2"**. In this case, the planing is necessary for a smoother surface, so that the board could be used for interior applications. via

## How wide is a 2x4 Really?

A piece of surfaced (sanded smooth) 2x4 lumber actually measures **1½ inches thick and 3½ inches wide**. In rough-cut condition, a 2x4 is slightly less than 2 inches thick and approximately 4 inches wide. When wood is milled from a rough to a smooth surface, it loses about ¼-inch from each of its four sides. via

## How wide is a 5 quarter board?

Each quarter refers to 1/4 inch of thickness, meaning that a 5/4 board is **roughly 1 1/4 inches thick**. If your project calls for a piece that is exactly 1 inch thick, you'll want to purchase a 5/4 board and mill it down to the proper size using a jointer/planer. via

## Why did lumber sizes change?

Lumber size standards came into being almost a century ago to meet the need for a **common understanding between the mill and markets that were separated by increasing distances of rail or water transportation**. Early concepts called for rough lumber to be of full nominal size, often in the dry condition. via

## Why is lumber 1/2 inch smaller?

During this process, **it shrinks as the moisture in the wood is removed and the wood cells shrink**. Once the drying is complete, the boards are then planed to a standard size. Hence, what started out as a 2 x 4 now measures 1 1/2 inches x 3 1/2 inches. via

## Are 4x4 actually 3.5x3 5?

This is **3.5x3.** **5**. A standard 4x4 post will measure 3.5x3.. As a standars 2x4 is 1.5x3. via