Baseboard Bullnose Corner

How to Install Baseboards around Bullnose Corners

Applying baseboards can be tedious, but it’s pretty straightforward on traditional corners. It might take some time and care, but it’s a project you can easily do on your own. However, when you want to apply baseboards to bullnose corners, you have to be prepared to be a little more patient.

To install baseboards on bullnose corners, you have to measure and cut your baseboards. However, since bullnose corners are rounded, you have to cut three 22 1/2° angle pieces to fit around the curved edge rather than the two 45° angle pieces you need for sharp corners.

In the rest of this article, I’ll go into details about what you need to know to install baseboards on bullnose corners. This includes also explaining what both bullnose corners and baseboards are, in case this is your first home improvement project.

Instructions for Installing Baseboards around Bullnose Corners

Installing baseboards on rounded corners is a little more of a time-consuming project compared to angular corners. However, it isn’t as daunting as it may seem.

You just need to make sure you have the tools you need and follow all the steps. But first, let’s cover the meaning of these terms.

Baseboards: Baseboards are the strip of material you often see lining the bottom of a wall where it connects with the floor. While they can be made of tile and vinyl, they’re most popularly made out of wood and are meant to cover where the wall and floor meet in a decorative way.

Bullnose Corner: If you’re wondering if this article is for you, you should determine if you have bullnose corners in your home. A bullnose corner is a rounded outside corner (the “point” where the two walls meet just outward).

Like traditional outward corners, bullnose corners are typically 90° angles, so those are the angle degrees I’ll be using for the rest of this article.

Supplies Needed for Installing Baseboards around Bullnose Corners
  • Measuring tape
  • Pencil (A carpentry pencil is best, but you can use any regular pencil you might have.)
  • A saw (A miter saw is preferred to cut the angles you need, but any saw you’re comfortable using will do as long as you’re able to cut precise angles.)
  • Wooden baseboards
  • Wood glue
  • Caulk
  • A hammer and nails OR a nail gun
  • Wood filler (optional)
How to Install Baseboards If You Have Bullnose Corners

Once you’ve assembled the materials you need, follow these steps to install baseboards around your bullnose corners:

1. Line Up Your Baseboards for Measurement

You’ll want to make sure you measure the length of the wall you’ll need from one end to the edge of the bullnose corner you’re installing around.

Since you’ll be trimming your baseboard around the corner, you’ll also want to measure that as well so you can account for that measurement when you cut your baseboard. In total, you’ll have three final measurements, and you’ll be cutting three pieces of wood.

2. Mark Your Measurements

Using your pencil, mark the wall where you’ll install your boards and the baseboards to know where you need to cut them.

(Tip: Deduct about ⅜ of an inch or about 9 ½ mm from the length you measured when marking your baseboards for cutting.)

3. Trim Your Baseboards

Adjust your miter saw blade so that it’s set to cut at a 22 ½° angle (this is different from typical corners where you’ll cut two 45° angle pieces) and cut your three baseboard pieces (one for each length of wall and one to cover the gap between the corners).

Remember, you can always trim extra wood off, but you can’t add it back. When in doubt, cut less than you think you might need to.

4. Check Your Measurements

Once you’ve cut your baseboard pieces, fit them to the corner you’re installing them around.

If you’ve cut accurately, there shouldn’t be much of a gap between the baseboard and the wall when the three pieces fit together.

Any gap should also be equal on both sides of the corner.

If you notice too much space, repeat steps 1-4 again until you’ve trimmed as much as you need to.

5. Glue It Together

Once your baseboard pieces are cut to fit perfectly around your bullnose corner, you’ll want to glue your pieces together.

I recommend assembling your pieces before you start installing them so you can make any necessary adjustments more easily.

Use wood glue to attach one wall side of your baseboard to your angle piece and let it set and dry completely.

Repeat this process with your other baseboard piece.

6. Fit and Nail

Now that your baseboards are assembled, you’ll fit the whole piece against the wall, and around the corner, you’re installing it too.

Once it’s in place, you’ll take your nail gun or your hammer and nails and hammer your baseboards to your wall.

There is no rule as to how many nails you need. However, for most baseboards, spacing your nails between 5-6 inches (12.7-15.25 cm) apart should be fine.

7. Filling in the Seams

If you notice any open seams in the wood where your baseboard pieces fit together, you can use wood filler to make them less noticeable.

You’ll also want to use caulk to carefully fill in any gaps you have between your baseboard and the wall if your baseboards aren’t completely flush against it.

Once you’ve got your baseboards installed, the difficult part of this project is all behind you, and you can leave them as is or paint and finish them however you like.

Final Thoughts

Bullnose corners are rounded outside corners that can make installing baseboards more tedious than typical corners.

However, installing baseboards around these corners isn’t too much different, nor is it much more complicated than installing baseboards on more angular corners.

Simply make sure you take accurate measurements and cut three pieces of your baseboard at 22 ½ ° angles, so they fit around your corner without creating a large gap between your baseboard and your wall.

You can do this simple home improvement project yourself with just a little patience and attention to detail.


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