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How to Repair Plaster Walls Over Concrete

Contributor
By John Boyanoski
eHow Contributing Writer
(2 Ratings)

A hole in a plaster wall may appear to be a daunting repair job, yet its not much harder than repairing a regular dryboard wall.

Difficulty: Challenging
Instructions

Things You'll Need:

  • Silicon putty or plaster cement
  • Drywall or plaster board
  • Small jig saw or sharp knife
  • Nails
  • Plaster tape
  • Several edging knives ranging from 4 to 10 inches
  • Sand paper
  1. Step 1

    Cut around the damage, making the hole perfectly square.

  2. Step 2

    Examine the hole. If the drywall is right against the concrete, you are in luck. You can slap a replacement piece in. However, if the plaster was supported by wood beams (most likely) then you will have to run some tape behind the plaster so that it forms a "brace" behind the hole in the wall.

  3. Step 3

    Cut a piece of dry wall to fit the square hole you cut and place it into the wall.

  4. Step 4

    Spread some of the putty over the spaces where the new wall meets the old, using the four-inch knife. Make sure to make it as smooth as possible.

  5. Step 5

    Place a long piece of tape across each of the spaces. Let it dry for 24 hours.

  6. Step 6

    Sand away some of the excess and bumpy parts of the putty.

  7. Step 7

    Cover the tape with putty (using the six-inch knife) and smooth it into the wall. Wait 24 hours and then sand again.

  8. Step 8

    Cover all of the previous work with the plaster cement/putty using the ten-inch knife. Sand one final time and you should be ready to paint.

Tips & Warnings
  • Use 400 grit sandpaper for the final application so you don't scratch the wall.
  • Avoid peeling the tape off the wall while sanding.

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