How to Finish Inside Drywall Corners Like a Pro?

how to finish inside drywall corners like a pro

Making perfect corners in drywall isn’t just about following rules; it’s about making a room look great. These little corners are important for how a room looks and feels. Imagine a room with uneven corners – they stand out and make the room look worse. In this guide, we’ll look at ways to make corners look amazing, so any room feels nicer overall.

Preparing for Finishing

Before we start making perfect corners in drywall, it’s important to get ready properly. Here’s a simple guide to prepare your corners for a great finish:

  • Assess the Corners: Begin by carefully examining the inside corners for any imperfections, such as bumps, cracks, or uneven surfaces. Addressing these issues upfront will contribute to a smoother and more polished finish.
  • Clean the Corners: Thoroughly clean the inside corners using a damp cloth or sponge to remove any dust, dirt, or debris. Pay special attention to crevices and hard-to-reach areas to ensure a pristine surface for the subsequent steps.
  • Sanding: Sand the inside corners gently with fine-grit sandpaper. This helps smooth out any rough spots, making it easier for the joint compound to stick and giving you a smooth finish. Be careful to sand evenly and gently so you don’t harm the drywall.

Applying the First Coat: Embedding the Tape

Mixing the Mud (if using powder):

To make sure the joint compound is just right and doesn’t have bubbles, you need to mix it correctly. First, slowly add water to the powder compound in a clean bucket. Keep stirring until it’s smooth and creamy. Don’t mix too much, or you might get air bubbles in the mud.

Initial Mud Application:

Start by putting a thin layer of mud on both sides of the inside corner using a wide drywall knife. Hold the knife at a slight angle and spread the mud evenly, covering the whole surface smoothly. This first layer is important for putting the tape on and making sure it sticks well.

Folding and Embedding the Tape:

Fold the pre-creased drywall joint tape along the crease to make a sharp edge. Press it firmly into the corner, starting from the top and moving down. Use the wide drywall knife to gently push the tape into the mud, making sure it’s fully covered and there are no air pockets or gaps. Press firmly but not too hard to avoid moving the mud.

Smoothing the Mud:

Once the tape is in place, use a smaller drywall knife to smooth out any extra mud and make both sides of the corner flat. Hold the knife at a slight angle and run it smoothly along the corner, pressing gently to get rid of extra mud and make the surface even. Clean the knife often to keep it from messing up the finish. Do this until both sides of the corner look smooth and the same.

Second Coat: Building Strength

After the first coat dries completely, it’s time for the second coat to make the corner stronger. Start by making a new batch of joint compound, making sure it’s mixed well and doesn’t have any lumps or bubbles. Use a wider drywall knife this time and put on a slightly thicker layer of mud on each side of the corner. Spread it evenly, covering any mistakes or gaps from the first coat. Keep it smooth, and feather the edges so it blends nicely with the rest of the wall.

Achieving a Flawless Finish: Third Coat and Sanding

sanding drywall using fold sandpaper

Drying Time (Again):

Once more, it’s essential to stress the significance of allowing the second coat to dry completely before proceeding. Overnight drying is typically recommended to ensure optimal curing and durability of the joint compound.

Third Coat (Optional):

Two coats usually do the job, but sometimes you might want a really smooth finish, especially in important places. A third coat helps fill in any tiny mistakes and make the surface nicer. Put on a thin layer of mud with a wider drywall knife, making sure it’s even across the corner. Feather the edges so it blends well with the rest of the wall.

Sanding Basics:

Use a drywall sanding sponge or fine-grit sandpaper (start with 100-grit and move up to 220-grit) in circles. Press gently so you don’t take off too much compound, and use finer sandpaper to make the surface smooth.

Sanding Techniques:

When sanding inside corners, utilize a sanding sponge or fold sandpaper around a block to maintain a consistent angle and avoid rounding the corner. For high corners, consider using a pole sander for added reach, although it’s often optional for most projects.

Final Touches

If you find any mistakes during the check, fix them right away. Use a small drywall knife to add more joint compound to the spots that need it. Smooth the edges so the repairs match the rest of the wall. Let it dry completely before sanding and checking again to make sure it looks how you want it.

FAQs About Finishing Inside Drywall Corners

Can I use regular sandpaper for sanding inside corners, or do I need a specific type?

While regular sandpaper can be used for sanding inside corners, it’s often more convenient to use sanding sponges or sanding blocks specifically designed for drywall work. These tools are more flexible and easier to maneuver in tight spaces, making them ideal for achieving a smooth finish along inside corners.

How do I prevent sandpaper from clogging up when sanding inside corners?

To prevent sandpaper from clogging up with dust and debris when sanding inside corners, regularly tap or brush off the excess material. Additionally, using a vacuum attachment or dust extractor while sanding can help remove debris and prolong the life of the sandpaper.

Can I skip using joint tape for inside corners?

While joint tape is not always required for inside corners, it is highly recommended to reinforce the joint and prevent cracking over time. Using joint tape ensures greater stability and durability, especially in high-traffic areas or where walls may experience movement.

Can I sand inside corners by hand, or do I need to use a power sander?

While sanding inside corners by hand is possible, it can be challenging to achieve a uniform finish, especially in tight spaces. Using a power sander or a sanding sponge specifically designed for drywall work can make the sanding process more efficient and effective, ensuring smoother results with less effort.

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