When installing a new floor, door jambs can be particularly frustrating to work around. Before you get started, head to your local hardware store and rent a special 'undercut' or 'jamb' saw for cutting these pieces.
Step 1 - Measure the Door Jamb Area
Measure and mark a line across the width of the doorway where your tile and laminate will come together.
Step 2 - Prepare the Laminate
Next, place a piece of scrap laminate on a piece of underlayment and press it up against the front of the doorway. Mark the height of the laminate and underlayment thickness along the jamb and the door molding. Do the same thing on the opposite side. This will serve as your cutting line for the laminate side of the door jamb.
Step 3 - Prepare the Tile
Place a piece of tile on the back side of the doorway up against the jamb. Add ¼-inch (or whatever the thickness of your inset), and then make a mark against the door jamb and molding.
Step 4 - Preparing to Cut the Laminate Side
Adjust the depth of cut on your undercut saw to the height of the laminate side of the door jamb. Check and double-check this measurement.
Step 5 - Cutting the Laminate Side of the Door Jamb
For this step, wear safety glasses.
Start by cutting the front portion of each side of your doorway. Ensure that the laminate side is lower than the tile side. This will help in case you overlap your cut a bit—it won't ruin your door jamb.
Step 6 – Cutting the Tile Side of the Door Jamb
Reset the undercut saw to the height measurement of the tile side. Cut the side of each side from the center through to the door trim.
Once you've completed this step, you can finish your flooring.