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How to Frame a Plate-Glass Wall Mirror

Transform the look of a bathroom by installing decorative trim around a plain plate-glass mirror.

Janell Beals, Isabella & Max Rooms
Bathroom with Large Mirror and Chalkboard

Materials Needed:

  • 70-1/2" length 4 1/2" wide primed MDF baseboard
  • 70-1/2" length 3 1/2" wide primed MDF baseboard trimmed down to 1"
  • 70-1/2" length 3 1/2" wide primed MDF baseboard trimmed down to 1 1/2–"
  • 38-1/2" lengths 3 1/2" wide primed MDF baseboard (2)
  • 63-1/2" length 3-1/2" wide primed MDF baseboard
  • tape measure
  • paneling adhesive
  • extra-strength wood glue
  • caulk
  • level
  • latex paint
  • latex paint extender
  • extra-fine sanding pad
  • paint brush
  • painter's tape
  • tack cloth
  • drop cloth

Step 1: Measure Mirror and Select Frame Style

Determine trim style and positioning of trim around mirror to obtain measurements specific to mirror being framed. Use measurements to cut lengths of primed MDF baseboard. Tip: Have materials cut at a home improvement store and consider using style of door casings in home as inspiration for the look of the mirror frame.

Measure Space for Mirror Frame

Step 2: Prepare Work Area

Gather required materials. Lay out lengths of trim on flat working surface.

Set Up Work Area

Step 3: Paint Back Sides

Add latex paint extender to paint, lengthening drying time and minimizing brush strokes. Paint back side of trim along edges that will extend over edges of mirror. Let dry two hours.
Tip: The back edges will be reflected in mirror.

Paint Both Sides of Mirror Frame

Step 4: Paint Trim

Paint front sides and edges of trim. Let dry two hours.

Paint Mirror Frame Trim

Step 5: Sand

Use extra-fine sanding pad to lightly sand surfaces. Wipe clean with tack cloth.

Sand Mirror Frame Wood

Step 6: Glue Top Frame Together

Glue three lengths of MDF baseboard forming top frame with extra strength wood glue. Press pieces firmly together. Let dry two hours.

Glue Top of Mirror Frame

Step 7: Caulk Joints

Run a bead of caulk along seam joints. Smooth caulk line and wipe away any excess. Let dry one hour.

Caulk Frame of Bathroom Mirror

Step 8: Apply Touch -Up Paint

Paint over caulk by lightly brushing layer of paint along joint.

Touch-Up Mirror Frame

Step 9: Apply Second Coat of Paint

Paint a second layer of paint over fronts and sides of trim. Let dry 12 hours before installation.

Let Second Coat of Paint Dry

Step 10: Install Top Frame

Apply paneling adhesive to area where top frame piece will be positioned.

Install Top of Mirror Frame

Step 11: Position and Tape

Press frame piece onto adhesive, check for proper placement and ensure piece is level. Secure in place using clean-release tape.

Position Mirror Frame

Step 12: Repeat Steps

Repeat prior steps, installing two side pieces of trim followed by bottom piece.

Ensure Frame and Mirror Attach

Step 13: Check Placement and Tape

Check all joints where trim meets to ensure pieces are positioned correctly and square. Make any necessary adjustments before adhesive begins to dry. Secure in place using clean–release tape. Let dry 24 hours.

Check Mirror Placement

Step 14: Caulk Joints

Run a bead of caulk along any gaps at joints. Smooth caulk line and remove any excess. Let dry one hour.

Caulk Frame of Bathroom Mirror

Step 15: Apply Touch Up Paint

Paint over caulked joints and any areas of frame requiring touch-ups.

Touch-Up Mirror Frame
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