How to Install a Marble Threshold Without Cutting the Doorframe

Open the door fully so that you can access the entire bottom of the floor easily. If needed, remove the pins from the hinges and lift the door off of the frame to create more space.

Examine the sides of the doorjamb and stretch a tape measure across the widest portion to measure the length. For example, if the doorjamb has a contoured edge where one part sits further back, ensure you measure from that point. Measure the width of the doorframe opening with the tape measure, as well.

Lay a piece of 1/4-inch-thick hardboard or plywood on a table and use the tape measure and a pencil to draw a rectangle on it in the dimensions of the threshold opening.

Don safety glasses and cut out the rectangle from the wood, using a jigsaw.

Place one end of the rectangle template up to the left side of the door as far as possible. Note that it won’t fit flush due to the contoured design of the jamb.

Insert a pencil into a scribe tool and place the metal point of the tool on the widest point of the frame, or the part that is furthest back. Open the pencil end of the scribe until it touches the narrowest portion of the frame to create a gap.

Pull the scribe tool along the edge of the template, making sure not to alter the gap and draw a cut line on the template. Follow the contours of the jamb carefully to create the contoured design on the wood. Repeat the process on the opposite side of the jamb, using the same method.

Cut out the new pencil lines on the template, using the jigsaw.

Lay the marble threshold on a table and draw straight lines on either end that correspond to the original dimensions of the wood template.

Set up a ceramic tile saw by filling the lower base with water per the manufacturer's instructions and plugging in the power cord. Cut along the side lines on the marble threshold, using a ceramic tile saw.

Lay the wood template on top of the threshold and trace along each edge to draw the contoured design onto the marble. Set the template aside and cut along the new lines, using the ceramic tile saw.

Apply a 1/2-inch bead of silicone caulk or construction adhesive to the bare strip inside the center of the door opening and press the marble threshold in place. Wipe away excess adhesive or caulk, using a damp rag.