How to Repair an Interior Cracked Wall How to Repair an Interior Cracked Wall

What You'll Need
Interior Filler
Putty Knife
Damp cloth
Utility Knife
Orbital Sander
Tack Rag
Warm Water
Fine Grade Sandpaper

Repairing a cracked wall is a relatively simple project, providing you have the ‘know how’ and the right tools and materials. Some simple rules to follow will produce the best results and give you a well-finished wall that you can paint or wallpaper over.

Step 1 – Preparation

Preparation is of the most importance aspects of cracked wall workand will ensure that your wall will accept the repair without any blemishes or raised areas when you are finished. Wash the wall around the area of the crack and vacuum, if necessary, to eliminate any debris or dust that can hamper the adhesion of the filler putty. Wipe clean and dry with a tack rag.

Step 2 – Preparing the Crack

If the crack is a simple hair line fracture caused by general house movement, the basic solution is to clean the crack with a utility knife and get rid of any dust. If the crack is a large,r it will require thorough cleaning. Sometimes, it is better to create a slightly larger crack that will take a better proportion of filler and offer a solid base. However, you should let your eyes judge whether the wall needs that type of attention.

Step 3 – The Filler

If the wall is drywall or plasterboard, make sure you buy the correct filler for the surface you are working on. Most fillers come ready-mixed so there is no need to make a mess as there are no wet and dry materials to mix. Simply open the tub and apply the putty.

Step 4 – Filling the Crack

Using the putty knife, apply the filler in a crossed direction from the crack and make sure it gets plenty of filler inside. Next, using the flat edge of the putty knife, smooth out the putty and flatten the applied area until it is flush with the wall. Work in smaller areas and work down the crack from the top. If the crack runs lengthways, start at one end and move along the crack in three or four inch increments until the crack is filled.

Step 5 – Drying and Sanding

Once the first application of filler has dried, you may find it will have shrunk a little in the original crack. If this happens, sand the top layer a little with fine grade sandpaper and wipe with the tack rag. Apply a second application of filler if needed. Let that dry thoroughly.

Step 6 – Finishing

If you have let the entire surface dry and the filler has hardened, you can then proceed with sanding. Using an orbital sander will offer a better finish and level out any slight raises in the finish. Sand the wall completely around the worked area and wipe once again with a tack rag. Your crack should now have completely disappeared and you will have fresh, unblemished piece of wall to paint over.

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