Cracks in drywall corners can be both unsightly and a sign of underlying issues. Over time, homes settle and shift, causing stress on the walls and leading to cracks, especially in corner areas. Fortunately, fixing these cracks is a straightforward process that requires the right tools, materials, and a bit of patience. In this blog post we will show you how to fix drywall cracks in corners so that it functions properly. Read on to learn more about which components and tools are needed for the job as well as detailed instructions on completing the task!
Why Drywall Cracks Appear in Corners
Drywall cracks in corners are often caused by natural movements in a home’s structure. Over time, changes in temperature and humidity can cause the materials in your home to expand and contract, leading to stress on the drywall. Additionally, foundation settling is a common culprit, as it causes walls to shift slightly, creating tension at weak spots like corners. Poor installation techniques, such as insufficient joint compound or improper tape placement, can also contribute to corner cracks. Understanding these causes is the first step to addressing the issue and preventing it from recurring in the future.
Common Types of Cracks
When it comes to cracks in drywall corners, they can typically be categorized into a few common types. Hairline cracks are thin and superficial, often caused by minor settling or temperature fluctuations. Diagonal cracks, which run at an angle, often indicate more significant structural shifts, such as foundation settling or framing movement. Vertical or horizontal cracks, depending on their placement, may point to stress from improper installation or shifting walls. Lastly, stair-step cracks, often found near corners or along joints, can suggest uneven settling or issues with the home’s foundation. Identifying the type of crack is essential for determining the severity of the issue and the proper method of repair.
Tools and Materials You’ll Need
Having the right tools and materials on hand is critical for assessing and repairing cracks effectively. Below is a list of commonly needed items:
- Safety gear: Gloves, safety goggles, and a dust mask to protect yourself during the repair process.
- Measuring tools: A ruler or measuring tape to determine the size and length of the cracks.
- Putty knife or trowel: For applying patching materials.
- Crack filler or epoxy: To seal large or small cracks, depending on the severity.
- Caulking gun: If using sealants that require precise application.
- Mortar mix or concrete patch: For more substantial repairs involving masonry or foundation cracks.
- Paint or finish: To restore the repaired area to match the surrounding surface.
- Brush or vacuum: To clean out debris and dust from the crack before repairs.
Ensuring you have these items ready will streamline the repair process and allow you to address structural concerns thoroughly.
10 Methods How to Fix Drywall Cracks in Corners
1. Assess the Crack and Surrounding Area
Before repairing a drywall crack in a corner, it is essential to carefully assess the damage. Examine the length, width, and depth of the crack, as well as the condition of the surrounding drywall. Check for signs of water damage, mold, or structural issues that may have caused the crack. Understanding the root cause ensures that your repair is effective and long-lasting, preventing the crack from reappearing. Proper assessment also helps determine whether additional reinforcement is needed in the corner area.
2. Clean and Prepare the Crack
Start by cleaning the area around the crack. Use a utility knife or a putty knife to widen the crack slightly and remove any loose or flaking drywall compound. Dust and debris should be thoroughly removed using a brush or vacuum. Cleaning and preparing the surface ensures better adhesion for patching materials and prevents the new compound from separating from the wall. A clean surface is the foundation of a durable and smooth repair.
3. Apply Corner Bead for Reinforcement
For cracks in outside corners, installing a corner bead provides structural support and helps maintain a sharp, straight edge. Metal or plastic corner beads are commonly used and are fastened using drywall screws, nails, or adhesive. Once secured, the corner bead distributes stress along the corner, reducing the likelihood of future cracks. Proper installation of a corner bead is crucial for achieving professional-looking, long-lasting results in corner repairs.
4. Use Joint Compound to Fill the Crack
Apply a layer of high-quality joint compound to the crack using a putty knife. Press the compound firmly into the crack to ensure it fills the gap completely. For deeper cracks, multiple layers may be necessary. Allow each layer to dry before applying the next to avoid shrinkage or cracking. Filling the crack with joint compound restores the smooth surface of the drywall and provides a strong base for further finishing work.
5. Embed Drywall Tape for Additional Strength
For larger or recurring cracks, embedding drywall tape over the crack adds extra reinforcement. Paper tape or fiberglass mesh tape can be used, depending on preference and crack severity. Lay the tape over the wet joint compound, pressing it firmly into place, and then cover it with another layer of compound. The tape helps prevent the crack from reappearing by reinforcing the joint and distributing stress along the corner.
6. Feather the Edges for a Smooth Finish
After applying the joint compound, feather the edges outward using a wide putty knife. Feathering blends the repair with the surrounding drywall, eliminating visible ridges or abrupt transitions. This technique ensures that the repaired corner appears seamless once painted. Take your time with feathering, as a smooth transition is key to achieving a professional finish and making the repair virtually invisible.
7. Sand Between Layers Carefully
Once the joint compound has dried, sand the repaired area lightly using fine-grit sandpaper. Sanding removes ridges, bumps, and imperfections, creating a smooth, even surface. For deep or layered repairs, sand lightly between each layer of compound to maintain a level surface. Proper sanding is essential for preparing the corner for primer and paint, ensuring that the final repair looks polished and professional.
8. Apply a Second or Third Layer of Compound if Needed
In cases where the initial repair does not fully blend with the surrounding drywall, additional layers of joint compound may be necessary. Apply each layer thinly, extending slightly beyond the previous layer to gradually feather the repair into the wall. Allow each layer to dry completely before sanding and applying the next. Multiple layers help achieve a perfectly smooth corner and reinforce the repair against future cracking.
9. Prime the Repaired Corner
Once the repair is sanded and smooth, apply a high-quality primer to the corner. Priming seals the joint compound, improves paint adhesion, and prevents uneven absorption of paint. For corners that have been reinforced with tape or a corner bead, primer also helps unify the texture, making it easier to achieve a consistent finish. Proper priming is an essential step to ensure that the repaired corner is durable, visually consistent, and ready for painting.
10. Paint and Finish the Corner
The final step is to paint the repaired corner to match the surrounding wall. Use a high-quality paint and a brush or roller for even coverage. Apply multiple thin coats rather than a single thick coat, allowing each layer to dry completely before applying the next. Feather the paint slightly beyond the repaired area to blend it seamlessly with the existing wall. Proper painting not only restores the aesthetics of the corner but also protects the repair from moisture, wear, and future cracking, completing the restoration process.
Maintenance and Upkeep
Once the corner repair is completed and painted, regular maintenance is essential to ensure its longevity. Periodically inspect the area for any signs of new damage, such as cracks, peeling paint, or moisture intrusion. Address minor issues promptly to prevent them from escalating into larger problems.
Keep the area clean by dusting gently with a soft cloth and avoiding abrasive materials that could damage the surface.
Additionally, monitor the surrounding walls for wear and ensure proper ventilation in the room to minimize humidity levels. Consistent upkeep not only preserves the repaired corner but also maintains the overall integrity and appearance of the space.
Safety Considerations
When performing repairs or maintenance, it is essential to prioritize safety to avoid accidents or injuries. Always wear appropriate protective gear, such as gloves, safety glasses, and a dust mask, to shield yourself from potential hazards like debris, sharp edges, or harmful substances.
Ensure the workspace is well-lit and free from clutter to prevent trips or falls. If ladders or stools are required, make sure they are stable and properly positioned before use. When handling tools or materials, follow the manufacturer’s instructions and use them only for their intended purpose. Finally, if a repair involves electrical components or other complex systems, consult a professional to reduce the risk of harm or property damage. Prioritizing safety ensures a smoother and more effective repair process.
Conclusion
Fixing drywall cracks in corners requires careful assessment, proper surface preparation, and attention to detail at every stage. From cleaning and widening the crack to reinforcing with corner beads, applying joint compound, embedding tape, feathering, sanding, priming, and painting, each method ensures a durable, seamless, and professional-looking repair. Follow these simple instructions outlined in this blog post about how to fix drywall cracks in corners, and you’ll be able to get the job done with ease.