If we measure a 2×4×8 we’ll see that it actually measures 1-½ inches × 3-½ inches × 8 feet. The thickness and width of a board are measured in inches and the length is measured in feetīut there’s more. So that’s the first confusing thing about understanding wood sizes. The third number (8) refers to the length of the board in feet. The second number (4) refers to the width of the board in inches. The first number (2) refers to the thickness of the board in inches. Let’s look a little closer at a 2×4×8 and breakdown what each number means. We’ll often see woodworking plans calling for a board like a 2x4x8 (spoken as a two by four by eight or just two by four). Why Are Lumber Nominal and Actual Sizes Different?.What Do the Numbers Mean in Wood Sizes?.Click here to visit my site policies.īefore we get into understanding wood sizes, be sure to click the subscribe button at the bottom of this page to sign up for my FREE weekly newsletter loaded with helpful pocket hole tricks, space-saving workshop ideas, clever DIY tips and more! There is no cost to you for using these links. Purchases made using these links help support the Saws on Skates website and allow me to share more DIY projects. This post contains affiliate links to supplies or tools I used to complete this project. Related: Beginner’s Guide to Woodworking Terms Today we’ll learn why a 2×4 is not 2 inches by 4 inches and I’ll share helpful tips about understanding wood sizes. I understand that it’s easy to become overwhelmed. There are so many numbers and terms to learn. Again, this is completely contingent on local code requirements, so be sure to double check the local codes where you live.Wood sizes are confusing! Why is a 2×4 not 2 inches by 4 inches? I’m sharing why actual wood sizes are different so you can understand how and what to buy. In the case of a fire or another emergency, the window well needs to have enough clearance to allow escape. When thinking about basement window sizes, also consider the size of the window well outside it. Therefore, the window you choose should allow for a clear opening width of at least 20 inches and a clear opening height of at least 24 inches. For example, a single-hung window can only really open to roughly half the total height of the window. Please keep in mind that “net clear opening” refers to the size that the window opens to, not the size of the window itself. Minimum 20 inches of net clear width opening.Minimum 24 inches of net clear height opening.Exception: 5.0 square feet allowed if located at grade floor or below grade.Minimum 5.7 square feet of net clear opening area.The minimum required dimensions of the window must include compliance with all of the following: the net clear opening area, net clear height opening and net clear width opening. That said, here are some general recommendations to abide by. It’s important to remember that egress window size requirements vary by state and municipality. The International Building Code states that every bedroom in a basement must contain at least one egress window. While special shape windows look beautiful and unique, the framing and the glass will have to be custom built for your specific space which normally increases your costs. Common window sizes are typically more affordable than special shape windows. Common sizes typically have standard prices that can be easily found online or by speaking with a rep. Knowing the common sizes that are needed throughout your home can also help you estimate costs more accurately. Standard sizes require less design time upfront, making the manufacturing process quite efficient. Uncommon window sizes can sometimes take more time to design and manufacture than basic shapes and sizes. Time is another factor to consider when selecting a window size. If your window measurements are even a little off, this can be a very costly mistake. Alternatively, an uncommon size or special shape window requires very accurate measurements that cannot be cross-referenced with a standard size chart. A measurement that matches up with a standard size affirms the size needed and inspires confidence in your measurement. When measuring for replacement windows, the process is simpler when the size you need is common. Using common window sizes in your home can help make the window buying process easier, quicker and less expensive.
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