However, most walls do not form a perfect 90-degree angle, so you will notice gaps in the connection.

Then, position the edge of the trim to the left of the saw blade, holding it firmly against the built-in metal fence for stability as you cut. Use a tape measure on the wall, but also hold the piece of trim to the wall to get an idea of how it will fit.To cut an inside corner trim, you’ll use the same process, then make another cut with a coping saw to make a more precise angle. With more than four years of experience, he specializes in high-end real estate development and construction. Then, type this into an angle calculator to determine how to adjust a miter saw to cut the trim perfectly.

Use the 0-degree setting on the miter to slice through the ends of the trim opposite of the miter cuts. If the boards don't connect cleanly or rest flat against the wall, caulk can cover up the imperfections. Place the nozzle near the gap you need to fill, then gradually move the it along the gap while holding down the gun's trigger. Although each piece of trim needs to be cut to a specific length, overestimate the length of trim you need to ensure you have enough to cover the corner. You can use short pieces of trim to form the corners as needed, then connect them to longer pieces of trim.To get a better sense of this, hold the trim up against the wall corner where you plan on installing them. Make sure the boards are set up exactly as they will be when you put them on the wall, or else you won't get an accurate cut. If you can't get the angle right, fill in the gaps with paintable silicone caulk, then paint over it to hide it. Use a pencil to mark the angle of the first piece onto the second one as a guideline for the next cut.