How To Cut Coving Corners Using a Mitre Box

Are you learning how to cut coving corners like a professional? Mastering cutting coving corners is essential for achieving a flawless finish in your interior design projects. One of the most effective tools for this task is a mitre box. This comprehensive blog post will guide you through the step-by-step process of cutting coving using a mitre box. From understanding the basics of coving to selecting the correct type of mitre box, we’ll cover all the essential details. Get ready to elevate your craftsmanship and create seamless and stunning coving that will enhance the beauty of your space.

What is Coving, and Why are Corners a Challenge?

Coving is a decorative moulding that is commonly used for the finishing touch of any wall and ceiling project. It is usually installed to give a room a more refined and elegant look. However, placing coving pieces in the corners of these spaces can be pretty challenging. A room’s internal and external corners require extra attention and precision due to the complicated angles involved. 

Another obstacle faced when installing coving is the ceiling edge of the coving and the wall edge of the coving, both of which require careful cutting and joining with the surrounding surfaces. Fixing the coving to fresh plaster can also be a hurdle, as the character must be completely dry before installation. It is essential that the coving is placed perfectly to achieve a polished look. The wall and the ceiling should also be carefully measured and leveled to ensure the coving sits flush against the surfaces. 

How To Cut Coving Corners
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Additionally, using a hand wall can assist in the accuracy of installation. Despite the challenges of placing coving, the result adds a beautiful finish to any room.

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Types of Coving: Understanding the Differences Before You Cut

Coving can be a great way to add a polished finishing touch when decorating your home. However, it is essential to understand the differences between the types of coving available before making any cuts. There are several types of coving, including internal corner, external corner, plaster coving, duropolymer coving, and polystyrene coving. 

Internal corner coving is designed to fit snugly into corners where two walls meet, while external corner coving is used outside the corners. Plaster coving is a traditional material best used on straight walls, while duropolymer and polystyrene coving are preferred for curved or uneven walls. 

Some coving comes with pre-cut lines to make installation more accessible, while others require measuring and cutting on your own. Ultimately, whether you choose internal or external coving, polystyrene and duropolymer, the most important thing is choosing a style that complements your home and fits your aesthetic.

Step-by-Step Guide: How to Cut Coving Corners Like a Pro

A touch of cornice or coving can be a great idea if you want your home to look more polished and elegant. Coving is a fantastic way to transform the edges of your ceiling and walls into something extraordinary. Cutting corners for coving can be daunting for many people, but it can be accomplished quickly with the right tools and approach. 

To start, you will need two pieces of coving, polystyrene, and duropolymer material, a saw to cut, and a cutting guide. First, place the left-hand piece of coving on the box to cut a 45-degree angle on the back of the coving. Then, place the coving in position on the left-hand corner after measuring the length needed and cut the right-hand side of the coving at 45 degrees. 

Next, join the two pieces of coving with a mitre saw and place them in position. To create pre-curved corners, you can buy coving with a block on the box side and cut it from the bottom. With the help of a crosscut saw, run the saw through the slot on the right corner of the box and the slot on the left. 

Finally, place the coving with a mitre box with the wall edge and repeat the process around the room. Cutting coving corners like a pro is not rocket science with the right tools and techniques. So, don’t hesitate to start your project today!

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Benefits of Using a Mitre Box for Cutting Internal and External Mitre Joints

Mitre boxes come in handy when it comes to cutting internal and external mitre joints, and they offer a variety of benefits. One of the benefits is that it helps to maintain an accurate angle when cutting the right hand corner or left hand piece of a joint. The top of the box has pre-cut corner mitres that are ideal for ensuring a perfect fit for the coving length. 

Additionally, the mitre box provides an easy way to cut internal mitres since one only needs to place the coving in the mitre box, align it with the side of the box and then make a mitre cut. Furthermore, it offers the easiest way to cut coving corners. This is because one only needs to place the coving at the bottom of the box, join two pre-cut corners, and then cut from the bottom corner slot.

The block and cut method can also be used by placing the coving upside down in the mitre block and using the mitre block to ensure that the coving is cut at the correct angle. One only needs to insert the crosscut saw in the corner slot and cut from the top downwards while keeping the coving with the lines on the block. Cutting coving with a mitre box becomes effortless by utilizing the corner slot.

From Plaster to Cornice: Tips for Putting Up Coving and Getting a Flawless Finish

When installing coving, there are a few essential tips to remember if you want to achieve a flawless finish. Firstly, you must ensure that your coving is the right fit for your room. This may mean cutting it down to size to ensure it fits snugly against the wall. Next, it’s essential to understand the difference between cornice and coving. While these two terms are often used interchangeably, they refer to slightly different types of decorative molding – with cornices typically more extensive and elaborate than coving.

When fixing your coving to the wall, it’s essential to avoid leaving gaps between the coving and the wall, as this can create unsightly lines that detract from the overall effect. To ensure that your coving sits flush against the wall, you may need to use a mitre box to cut corners properly. This is particularly important if you’re working with an older property where the walls may need to be more perfectly straight. 

When installing your coving, it’s also a good idea to use a strong adhesive to hold it in place. You can slot the coving into the bottom slot of the mitre box and then place it onto the adhesive before carefully pressing the coving together to ensure a tight fit. Following these tips, you can transform any room into a stylish, sophisticated space with beautiful coving.


In conclusion, learning how to cut coving corners using a mitre box is a valuable skill that ensures a precise and seamless fit for your coving installation. By understanding the need to cut corners with a mitre box, you can achieve clean and accurate angles that perfectly match the shape of your walls. With its angled slots, the miter box provides the guidance and support necessary for cutting coving at the correct angles. Simply place the coving in the box and align it with the bottom slot for a perfect fit. With this knowledge, you can confidently tackle your coving project and create beautifully finished corners that enhance the overall look of your space.

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