[STEP BY STEP GUIDE]
Installing a door in a frame that's not square can be a feasible DIY project, however, it's important to take the necessary precautions and methodically follow the steps to avoid making costly mistakes. Here's the step-by-step process to successfully complete the task:
Grab your steel measuring tape to measure the opening's dimensions. Gather as much data as possible by measuring different areas of the frame. You can also use a level to check for peculiar angles to the door's frame, which you should also fix as you proceed with this procedure.
Use your steel measuring tape again for this step. This time, measure your door's dimensions and document your findings. This step should give you an idea of how to modify the fixture to fit the frame.
Cut the marked areas of the door with your skill saw. Next, bring the cut door to the unsquare frame for a test fit. Modify the door's measurements further if needed.
Place level near door frame and use as a guide, ask for help if needed. Secure top hinge and add shims, then move to bottom hinge and repeat. Check level of both top and bottom after finishing.
Measure door gaps due to uneven frame and cut car seat foam to size. Apply silicone caulk on small gaps, spread with finger and let dry. Fill large gaps with car seat foam and seal with silicone caulk. For bottom gap, apply weatherstripping tape following manufacturer's instructions.