How To Hide Wall Cracks (5+ Ways)

Cracks in walls are a common issue that most homeowners have to deal with at some point. Ignoring cracks or just painting over them is not a good solution, as the cracks will likely reappear over time. Properly fixing wall cracks is important for several reasons:

Prevent Further Damage

Leaving cracks unrepaired can lead to further damage over time. As seasons change and temperature and humidity levels fluctuate, untreated cracks tend to expand, letting in moisture that can cause swelling, peeling paint, mold growth, and weakened wall structures. Fixing cracks prevents extensive repairs down the road.

Improve Appearance

Cracks detract from the nice, smooth appearance of walls. Properly fixing them makes your home look better aesthetically. This is especially important if you plan to sell your home in the future. Covering cracks improves wall appearance.

Enhance Energy Efficiency

Gaps and cracks in walls allow air leaks that reduce energy efficiency. Sealing cracks helps insulate your home better, keeping warm/cool air in and saving on energy costs. Improved efficiency also makes your home more comfortable.

Common Causes of Cracks in Walls

Before fixing wall cracks, it helps to understand why they occur in the first place:

Settlement and Shifting Foundation

Natural settlement of the foundation over time can cause small cracks as wooden framing and masonry shift. These cracks usually form vertically or diagonally near doors, windows, corners, and ceilings.

Temperature and Moisture Changes

As temperature and humidity levels change, building materials expand and contract, which can lead to cracks. These cracks typically form horizontally in the center of walls.

Faulty Construction

Weak spots in framing or masonry due to substandard construction quality can lead to cracks when settling occurs or moisture levels change. These cracks may appear anywhere and have no set pattern. Knowing the most likely cause of the crack can help determine the best repair method.

Preparing to Fix Wall Cracks

Proper preparation is key to achieving quality, long-lasting crack repairs:

Clean the Crack

Use a wire brush and vacuum to thoroughly clean inside the crack to remove old paint, dust and debris. This allows the filler compound to properly adhere.

Widen the Crack

Use a utility knife to cut open the crack into a “V” shape that is slightly wider at the surface. This helps the filler compound grab onto the edges better for a stronger bond.

Apply Primer

After cleaning, apply primer to the crack and surrounding area to improve adhesion. Use an oil-based primer for the best results. Allow it to completely dry before applying crack filler.Proper prep prevents further cracking and failure of the repair. Now let’s look at solutions for different types of cracks.

Fixing Common Drywall Cracks

Drywall cracks are very common but easy to repair with joint compound and mesh tape:

1. Apply Joint Compound

Use a putty knife to fill the crack with lightweight spackling or joint compound, pressing it firmly into the crack. Apply multiple coats if needed to build it slightly above the wall surface.

2. Embed Mesh Tape

While compound is still wet, press fiberglass mesh drywall tape into it to reinforce the crack. Smooth the tape flat, removing any air bubbles or excess compound. Allow to fully dry.

3. Apply Finishing Coats

Gently sand any ridges or high spots around the crack. Then apply 1-2 thin finishing coats of joint compound, extending it about 8” beyond the mesh tape edges. Let dry and sand smooth.

4. Prime and Paint

Once dry, the repaired area can be primed and painted to match the rest of the wall. Caulk trim edges for a seamless appearance.This mesh tape method works great for hairline cracks. Now let’s look at ways to tackle larger drywall cracks and gaps.

Repairing Large Drywall Cracks and Gaps

For cracks wider than 1/8″ across, mesh tape alone is not enough. Larger gaps require additional reinforcement:

Screw Mounted Backing

1. Clean out loose material and debris from inside the crack or gap. Ensure edges are sound.
2. Cut a piece of scrap drywall to fit tightly into the gap. Secure in place with drywall screws driven into the stud or masonry behind.
3. Apply fiberglass mesh tape over the backing plate. Embed joint compound over the tape, smooth, and let dry completely before finishing.

Wood Shims

1. Clean out the crack so edges are solid. Test fit shims of various thickness to achieve a tight fit.
2. Coat shims with carpenter’s glue and insert into gap, tapping gently with hammer if needed to fit tightly.
3. Once glue dries, break off excess shim ends flush with the wall. Finish by applying mesh tape and joint compound over the reinforced crack.

These methods work well for cracks up to 3 inches wide. For larger gaps, cut out and replace the damaged drywall section. Now let’s move on to fixing plaster cracks.

Repairing Cracks in Plaster Walls

Plaster crack repairs use similar techniques but require specialized patching compounds designed for plaster:

1. Expand Crack

Use a utility knife to cut open crack into an inverted “V”, widening it slightly towards the surface. Clean away loose debris.

2. Apply Patching Plaster

Press patching plaster deeply into the crack, working from the back forward and applying slight pressure to compact it tightly. Level it off flush with surface.

3. Reinforce with Mesh Tape

While plaster is still wet, embed crack bridging mesh tape, smoothing it to be flush with the surface. Allow plaster to fully cure.

4. Apply Finish Coat

Once fully dry, apply a thin finish coat of patching plaster, feathering it out several inches beyond the tape edges. Allow to dry completely.

5. Sand and Finish

Lightly sand the patched area, being careful not to damage the feathered edges. Apply primer and paint. On textured walls, match surface texture.Follow these steps for long lasting plaster crack repairs. Next we’ll look at solutions for masonry cracks.

Repairing Cracks in Concrete and Masonry

Cracks in concrete, brick, stone, and stucco require specialized patching compounds and methods:

1. Cut Out Loose Sections

Use a cold chisel to undercut and remove any cracked or crumbling material, creating a solid base to build the patch upon. Sweep or vacuum out debris.

2. Apply Bonding Agent

Brush a concrete bonding agent into the crack to improve adhesion. Let it fully cure.

3. Fill Crack with Patching Mortar

Work patching mortar designed for concrete and masonry deep into the crack, packing it tightly. Level it off flush as you go. Allow to fully cure per manufacturer instructions.

4. Finish Surface

If needed, use a mason’s grinding stone or sandpaper to smooth the surface of the patch. Clean off any dust. Finish by sealing, painting or applying surface coatings.Be sure to use patching compounds compatible with the masonry type for lasting repairs. Next we’ll explore solutions for hiding cracks under flooring.

Hiding Cracks Under Flooring

In some cases it’s acceptable to simply cover over cracks with new flooring. Here’s how to prepare cracks to be hidden under flooring:

1. Widen Crack

Use a utility knife to cut open crack into an inverted “V” shape, widening it slightly. This helps patch materials grab better. Sweep out any debris.

2. Apply Patching Compound

Work crack filler deeply into the gap, packing it tightly from back to front. For wider cracks, embed mesh tape into compound to reinforce. Level flush with surface.

3. Prime and Prepare Surface

Once patching materials have fully cured, apply primer to surface. This helps bonding of the new flooring. Correct any uneven spots along the crack.

4. Install Flooring

Follow all manufacturer’s recommendations for installing new vinyl tile, laminate flooring, carpeting or other floor coverings. This permanently hides the repaired crack.This method works for hairline cracks under most flooring. Now let’s go over preventative measures to avoid cracks in new construction.

Preventing Cracks in New Construction and Remodels

Here are some best practices to build crack-resistant walls:

Proper Framing

Use the correct size lumber for stud and joist spacing. Ensure framing is straight, level and square. This prevents settling cracks.

Sufficient Nailing

Secure all framing and substrates with an adequate number of nails spaced properly apart. This prevents shifting that leads to cracks at joints.

Control Joints

In masonry walls, install vertical and horizontal control joints at regular intervals to allow for expansion and contraction. Fill joints with flexible caulk.

Quality Materials

Use high quality lumber approved for framing. For masonry, choose crack-resistant mortar and bricks. Install all materials per manufacturer specifications.

Moisture Barriers

Properly install vapor barriers, tar paper, flashing and sealants to prevent water intrusion that can damage structures and finishes.Paying attention to these key factors in new construction helps create durable, crack-free walls.

Tips and Best Practices

Here are some additional pointers to ensure quality crack repairs:

• Allow all patching compounds to fully cure as directed before finishing to prevent re-cracking. Drying times vary by product.
• Feather out finish coats gradually over several inches to disguise transitions.
• On textured walls, match surface texture using spray texture or drywall mud.
• Prime repaired areas before painting to equalize absorbency between patch and original wall.
• Use high quality latex caulk to fill gaps where walls meet trim. Tool into a smooth, consistent bead. Proper prep work, the right materials, and careful finishing steps result in seamless crack repairs.

Frequently Asked Questions

Here are answers to some common questions about fixing wall cracks:

What is the best crack filler to use?

For drywall, lightweight spackling or joint compound works well. Use patching plaster for plaster walls and concrete. Ensure any patching product matches the wall material.

How long does crack filler take to dry?

Drying times vary based on product used, size of repair, temperature and humidity. Most take 1-3 days to fully cure. Be sure to allow sufficient drying time before finishing.

Should cracks be fixed or ignored?

Cracks wider than a hairline should be repaired to prevent further damage from moisture and pests. Even small cracks are best fixed for appearance and energy efficiency.

Is caulk or grout better for cracks?

Caulk is more flexible and better for moving joints that experience expansion/contraction. Grout is rigid and best used for stable surfaces like tile.

Can cracks reappear after repairing?

It’s possible for cracks to return if the underlying cause isn’t properly addressed, especially with foundation settling. Use reinforcement methods to help repairs last. Please reach out with any other questions!