Glam Outlook
general | March 12, 2026

How to Reinforce a Weak Bed Frame

If your daughter's top-bunk mattress seems to be heading south, it's time to bring in reinforcements. Whether yours is a twin or king, shoring up a sagging mattress is practically child's play. You simply reinforce the frame with a few well-cut wood pieces.

Things You Will Need

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  • Pencil
  • Tape Measure
  • Two 1-by-4 wood pieces, 6 or 8 feet (1.8 or 2.4 m) long
  • Carpenter's handsaw

Tip

Most beds need just two reinforcements. However, a king-size bed may warrant three.

  1. Remove the mattress and lean it against a wall or lay it flat. If possible, get someone to help you move the mattress.

  2. Measure the inner width of the frame from side to side with a tape measure.

  3. Using a pencil, mark the inner width of the frame on a 1-by-4.

  4. Using a carpenter's handsaw, carefully saw the 1-by-4 at the pencil line (see A).

  5. Repeat steps 3 and 4 on another 1-by-4.

  6. Lay each board on the inner rim of the bed frame, placing each 2 to 2 1/2 feet (60 to 75 cm) from the center (see B).

  7. None
  8. Lay each board on the inner rim of the bed frame, placing each 2 to 2 1/2 feet (60 to 75 cm) from the center (see B).

The Drip Cap

  • If your daughter's top-bunk mattress seems to be heading south, it's time to bring in reinforcements.
  • Using a pencil, mark the inner width of the frame on a 1-by-4.
  • Lay each board on the inner rim of the bed frame, placing each 2 to 2 1/2 feet (60 to 75 cm) from the center (see B).