Installing door trim works beautifully when all of the surfaces are in alignment. Uneven walls will throw off that perfect fit. But there is an easy procedure that brings the door trim into alignment with the door casing—despite uneven walls. It requires only a few simple tools, and you don't need to cut the door casing or door trim.
Installing Door Trim on Uneven Walls
Door trim surrounds a door opening on three sides like a picture frame. Trim covers the gap between the door casing and the wall. When the wall protrudes farther out than the edge of the door casing, one or both of the vertical door trim pieces will not meet the casing perfectly.
Tilting the door trim to force it to meet the casing is a poor workaround. This creates a visible gap on the wall side. Most telling, though, is at the top, where it meets the horizontal header trim. The angled trim doesn't align with this header trim.
The fix is to create a depression or pocket in the drywall so the trim rests slightly deeper into the wall. This works for trim that is up to 1/4-inch out of alignment with uneven walls. Sinking the trim deeper than 1/4-inch causes the trim to recede from view, and this is even more visible when other sections of the trim are not recessed.