To cut inside corner trim, use a fine-toothed saw or metal snips for precision. Measure the required length, mark the trim, and cut carefully along the marked line. For clean edges, lightly sand the cut end.

To install inside corner trim, align the trim along the wall corner, mark the screw points, and attach with flat end or pan head screws (sold separately). For a seamless look, use construction adhesive instead of screws, pressing firmly to ensure a secure bond.

To miter inside corner trim, set a miter saw to a 45° angle. Position the trim on the saw at the same angle it will sit against the wall, then cut both trim pieces to form a tight 90° angle when joined.

Typically, inside corner trim is cut at a 45° angle to create a clean 90° corner. Adjust the angle as needed based on wall irregularities to ensure a snug fit.

To cope inside corners, first cut one trim piece straight to fit flush against the wall. Then, use a coping saw to cut along the profile of the second trim piece so it fits snugly against the first, creating a seamless inside corner joint.