Plastic drywall corners are a fundamental yet often overlooked component in creating a smooth, professional-looking finished wall. Unlike their paper-based counterparts, these durable L-shaped pieces are designed to shield the vulnerable edges of drywall from dents, chips, and general wear and tear. Whether you are tackling a weekend DIY project or managing a large-scale commercial build, understanding how to use plastic drywall corners correctly is essential for achieving a clean and long-lasting result.
Benefits of Using Plastic Drywall Corners
The primary advantage of plastic drywall corners lies in their resilience. While paper corners can crack or crumble during installation or over time, plastic offers superior strength that flexes without breaking. This durability translates directly to your finished walls, ensuring the corner remains pristine even in high-traffic areas like hallways or entryways. Furthermore, these corners are significantly easier to handle and cut than their metal equivalents, making the entire process more accessible for beginners while still providing a high-quality finish for professionals.
Essential Tools and Materials
Before applying plastic drywall corners, you need to gather the right tools to ensure a precise fit. You will need a sturdy utility knife or a specialized drywall rasp for shaping the corner bead. Measuring tape is crucial for getting the lengths correct, and you will apply the bead using a standard trowel or broadknife with drywall compound. Keep a damp sponge handy for the final cleanup, and ensure you have the appropriate length of corner bead ready for the job.
How to Measure and Cut
Accuracy is key when measuring plastic drywall corners. Measure the total height of the wall from the floor to the ceiling, and transfer this measurement to the corner bead, marking it with a pencil. When cutting, position the bead on a stable surface and use your utility knife to score the material deeply along the line. Snap the bead sharply downward along the score, and then use the knife to trim any excess ragged edges for a clean, straight cut that aligns perfectly with the wall height.
Step-by-Step Installation Process
Begin by ensuring the drywall edges are clean and free of debris. Mix your drywall joint compound until it reaches a smooth, peanut butter-like consistency. Apply a generous layer of mud along the edge of the drywall where the corner will sit. Carefully align the plastic corner bead with the seam, pressing it firmly into the mud so that the fins on the back of the bead grip the compound securely. Use your trowel to spread additional mud over the bead, feathering the edges to create a smooth transition with the surrounding wall surface.
Drying and Sanding
Allow the first layer of drywall compound to dry completely according to the manufacturer’s instructions, typically taking 24 hours. Once dry, the bead may feel slightly rough or have minor ridges. This is normal. Use sandpaper or a sanding block to gently smooth these areas, being careful not to gouge the surrounding wall. A second coat of compound can be applied over the corner if needed to achieve a perfectly seamless look before painting.
Best Practices for Longevity
To ensure the plastic corner bead remains in excellent condition, it is vital to apply the joint compound correctly. Avoid applying the mud too thinly, as this can lead to cracking later on. Instead, build up the compound in thin layers, allowing each one to dry thoroughly before adding the next. This layering technique provides a strong bond that protects the drywall edge from impact and environmental stressors for the life of the wall.
Where to Use Plastic Drywall Corners
While plastic drywall corners are suitable for most standard residential applications, they shine particularly well in specific scenarios. They are ideal for finished basements, home offices, and bedrooms where a clean, finished look is required. Their resistance to moisture also makes them a practical choice for areas that might be exposed to humidity, provided the drywall behind them is properly sealed. Avoid using standard paper corners in these environments, as they are far more susceptible to damage.
