Tape measures' combination of being straightforward in their functionality and engineering are what have made them must-haves for any home tool kit. In fact, unless you use them professionally, there are likely some intriguing details and hidden functions on your tape measure that you've taken for granted. For instance, you may have not paid much mind to the recurring tiny black diamonds that align the top of your tool. While seemingly insignificant, these little diamonds play a big role in ensuring that a job runs smoothly.
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In the construction of most floors, walls, and ceilings, wooden or metal horizontal structures known as studs or joists are typically placed underneath to aid in supporting the structure. The diamonds on your tape measure, sometimes known as joist marks, indicate the spacing between each joist center. The distance between each joist mark varies depending on the specific tape measure, but typically you'll find them positioned 19.2 inches away from one another, usually dividing the tape measure into five different increments ending at the 8-foot mark.
Think of them in the same way as you would the 1-foot markers that line your tape measure, just less obvious. These signifiers were especially important in the older days of lumber and construction. However, even today professionals rely on these markers to ensure consistency and that they are staying within accordance with any regulations.
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Joist marks may be more handy than most homeowners think
Person marking wood with tape measure Stevecoleimages/Getty Images
Now that you know what the diamond markings on your tape measure are for, you may be wondering how you can get use out of them. Given that they are primarily used in professional situations, they may not seem all that useful for those who don't build houses for a living. However, you may be surprised to learn just how helpful these little diamonds can be in the right situation.
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While you're likely not the one installing the joists or studs in your house, it's still important for homeowners to know where they are located. Along with keeping your home stable, these hidden structures also play a role in supporting anything you hang on the wall, such as shelves, picture frames, and other decor. This is especially true if you need to drill into your wall for whatever reason. By drilling in the wrong spot, you risk your item failing to be supported or, even worse, damaging electrical wires or pipes.
Your tape measure can be a great ally in detecting hidden wood or metal beams and getting consistent spacing. Depending on your familiarity with your home's construction, you can choose to either use your tape measure on its own or alongside a quality stud finder for increased accuracy.
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