If it fell off your bathroom or bedroom , can cause considerable damage. Adhesive will hold the mirror but you will need a J-channel or J-clips to encourage it while the adhesive sets. It is not a bad idea to leave the supports in place.
Tools and Materials
For hanging the mirror the primary material you need is a flexible and robust adhesive, mirror adhesive. You will also need 3-inch wood screws to affix the clips to the wall studs, in addition to a J-channel, which should be made from metal or heavy-duty J-clips. Because you’ll want to scribe a line to mark the bottom border of the mirror do not overlook your degree. You will also need a stud finder, caulking gun and a drill using a No. 2 Phillips bit to drive screws.
Hanging the Mirror
Locate the studs, after using the pencil and level to draw on the line that marks the bottom edge of the mirror and then set up the clips or channel with the screws driven into every one. You may need a caulking gun to apply the adhesive to the rear of the mirror — do not be reluctant to use the whole tube. It takes two people to hoist the mirror and then drop it in channel or the clips, and you both need to wear gloves. After pressing on the mirror secure the top with clips. When the adhesive sets, it’s safe to remove the clips and then cover the holes with spackling compound.