The Different Grades of Lumber: What They Mean and When to Use Them

Walking into a lumber store and seeing different grades, terminology, and numbers can be confusing and overwhelming at first, but mastering the key terms is helpful for any avid DIYer. Knowing the different grades of lumber and when to apply them in your DIY projects at home will significantly improve your woodworking skills and the look of your projects.

Once you’ve got a grasp on the grades of lumber and when best to use them, you can start shopping at Wood Country Building Services, and with the help of our stellar sales associates, start to build the furniture and accessories of your dreams!

What is Lumber Grading?

Lumber grading gives each piece of wood or lumber an assigned grade. It’s important to grade wood as different strengths will only be appropriate for certain projects. Using the wrong grade of wood when framing a house can lead to weakened supports and substandard building.

Knowing what all of the grades of lumber are and when to use them is beneficial when undertaking any project or task at home that requires real wood. Knowing the differences can help your projects last longer and look better.

Select Structural Lumber

Select structural lumber is regarded as the highest grade and, therefore, the best quality of lumber.

You can be sure that any piece of wood with this grade will have minimal defects. Any knots will need to be a certain size, firm, tight, and well-spaced so that they don’t interfere with any major construction projects.

Construction Grade Lumber

Construction-grade lumber is often used for framing big projects like houses and sheds. The lumber needs to have tight knots, if any, as the pieces need to support large loads.

The number of defects in the wood will be limited for this grade, so you can be assured that your project will stand the test of time.

Stud Grade Lumber

Construction-grade lumber and stud-grade lumber are very similar; however, stud-grade lumber is specifically used for vertical beams in walls.

If you’ve ever had to hang something at home and been told to “find a stud,” this is what that saying refers to.

The quality generally needs to be solid and stiff, but the appearance can be outside the standard of construction grade.

Number 1 and BTR Lumber

When you see the acronym “BTR” means “better”, as in, this wood has been graded number 1 or better.

Number 1 lumber is similar to select structural lumber as it is the highest point on the grading scale. It’s strong, sturdy, and safe for outdoor projects and framing, such as decks.

Number 2 Lumber

Although the strength of number 2 lumber is almost the same as that of number 1 and select structural lumber, more knots are allowed as long as they are spaced apart and do not exceed a certain size.

This type of lumber is the most common type of wood for general construction jobs and can be used for framing.

Number 3 Lumber

Number 3 lumber allows for more defects and more knots than 1 and 2. The quality is still generally fair, but the strength might have some issues over time.

Feel free to use this type of lumber for small home projects that won’t support anything structural.

Utility Grade Lumber

While construction and stud-grade lumber need to be strong to support entire buildings, utility-grade lumber has a much lower restriction on quality and defects.

Generally considered to be the lowest quality of lumber, utility grade can be used for light framing projects, such as a temporary frame job of a shed or a building, when strength and appearance won’t matter.

Now that you’re familiar with the different grades of lumber, our team is available to answer any questions.