Hanging large-framed wall mirrors creates a complicated scenario. The heavy mirror must be installed correctly otherwise not only is your mirror in jeopardy, but the wall to which the mirror has been mounted may also sustain considerable damage should the fasteners fail. The best way to hang a large-framed wall mirror is on hardware secured in the wood studs of the wall. Drywall and plaster alone cannot withstand the weight of the mirror.
Use a stud finder to locate the studs in the wall in the area you wish to hang the mirror. Make a pencil mark whenever you encounter a stud. Stud finders are available at hardware, discount and home improvement stores. Your mirror will hang between two studs. Once you've determined the location of the studs, choose where the mirror will hang.
Calculate the hanging height of the mirror. Measure 57 inches up from the baseboard. Make a pencil mark on the wall.
Measure the mirror's length. Divide this measurement by 2. This is the mirror's half. According to Apartment Therapy website, then measure from the top of your frame to the hanging device installed on the mirror's back. This is the hanging measurement difference.
Subtract the hanging measurement difference from the mirror's half to find where the top of the frame should touch on the wall. For example, your mirror is 36 inches long. The mirror's half is 18 inches. The hanging measurement difference is 5 inches. So, 18 inches minus 5 inches equals 13 inches. You will measure up 13 inches from the 57-inch mark in Step 2.
Measure and mark on the wall the hanging measurement difference above the 57-inch mark (Step 2). This is where the top of the mirror's frame should touch.
Center a piece of plywood between two studs. Nail the centre of the board to the wall with a nail inserted on a diagonal. Rest a level on the top edge of the plywood to determine where the board is level. Mark a straight line above and below each end edge.
Align the board with the pencil marks on the wall from Step 6. Hammer a nail through the plywood into the stud at the left and right ends. According to Accurate Building Inspectors website, hammer several nails into the studs and wall to ensure the wood is not coming away from the wall.
Allow an assistant to hold the mirror into position with the frame's top edge aligned with the pencil mark on the wall (Step 5). Use a pencil to indicate on the wall where the mirror's hanging devices correspond to the wall. If the mirror is hung with a wire, lift the wire as far upward as it will go, while keeping the frame's top edge aligned with the mark from Step 5. Make a mark on the wall beneath the centre of the extended wire.
Screw the necessary number of wood screws (according to how many hangers are on the mirror's back) through the plywood and into the stud, leaving about ½-inch of the screw protruding from the wall to secure the hangers onto.
Never hang heavy mirrors directly into the drywall. The mirror will rip a chunk of the drywall away if it falls.