Michigan State University Extension
Home Maintenance And Repair - 01500380
06/24/03

Repairing Plaster Walls - Hole Through Wall


If there is a large hole through the wall, patching
plaster will not stick. Two methods can be used:

Method 1: (Vis. 1)
1. Mark a rectangle on the wall which includes the hole.

2. With a knife or key hole saw cut out the rectangle
being careful not to break it.

3. On a scrap piece of plaster-board, copy the section of
the wall.

4. Then mark a frame about 2" wide around the section of
wall.

5. After cutting, remove the paper on one side and the
plaster from the frame around the patch. The 2" frame of
paper will stick out like an ear all around which will
hold the patch in place.

6. Spread patching plaster around the edge of the hold
and around the edge of the patch. Put the patch in the
hole and press the paper ears into the plaster and hold
it while it sets.

7. Sand lightly and paint.

Method 2:(Vis. 2)
1. Cut a piece of metal plaster lath or heavy screen
larger than the hole.

2. Fasten one or two wire ties to the lath and insert
through the hole.

3. Pull the lath up behind hole and wire to a stick of
wood placed across the hole on the front side of the
wall.

4. Moisten the edge of the hole and spread a base coat
of patching plaster to within 1/8" of the finished
surface. Roughen the surface with a stick or nail so the
finish coat will stick.

5. After the base layer is dry, remove the stick and
clip the wires close to the surface.

6. Trowel on the finish layer being sure it is flush with
the wall surface.

7. Let it dry well and then paint.

8. If the patched area is large, apply a coat of sizing
before painting.

This article was written by Anne Field, Extension
Specialist, Emeritus, with references from Michigan
Extension bulletin Wall Repair and Fasteners.

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