How-to Guide For Taping Off-Angle Corners, Slanted, Cathedral, Tray and/or Vaulted Ceilings

Taping drywall corners is where hobbyists and non-professionals have the most difficulty. 90-degree corners, both inside corners and outside corners are quite common. However, off-angle corners (any corner that isn’t 90-degrees) are not as common and this is where most non-professionals have the most difficulty.

In this article, we will provide the instruction for you to get a professional result when taping and finishing any off angle corner.

When two slopes of a structure come together and the angle where they meet is less than 180 degrees, that is described as a “splay”. The photo below should make it clear:

For those that have completed a basement, kitchen, or bathroom remodel and are looking for how to tape off angle drywall corners then there are a few steps that must be followed.

The first step is getting the right product for the job. The typical form of tape for a 90 degree inside corner is paper tape:

Rolls of Drywall Paper Tape

However, paper tape has no structural strength and will not provide the best result in a splay. Professionals use a product called Ultraflex 325 which can be seen in this photo:

Ultraflex 325

This is a paper-coated vinyl product that does have some structural strength. When folded to meet the angle of the splay, the product will remain quite rigid and straight as seen in the photo below:

Ultraflex 325 Becomes Rigid When Folded

This product is much more expensive than paper tape, but will provide a very high quality result. The following video provides excellent aubible and visual instructions on the proper way to install and finish the Ultraflex 325 in an off angle corner:

The next step in the process involves measuring the corner that has been created. This is important because the tape will be measured to fit the joint that has been created. It is also measured to ensure that the tape will be the right width when the tape is placed. It is important to remember that if you are taping off an angle that you are working on then the flat part of the tape needs to face in the direction of the hole in the drywall. This is to ensure that the tape is level at all times.

Once the tape has been positioned as the next step is to anchor it into the drywall. You will need to use some joint compound as seen in the video above.

If you are wondering how to tape off drywall corners, you will find that it is not nearly as difficult as it may seem. If you follow the steps that are provided by the manufacturer, you should have no trouble the tape. If you are looking for an easier way to handle the tape job, you can always hire a professional that can show you how to tape off angles in drywall.

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