Applying jointing strip to an outside corner

Are you intimidated by applying joint tape to an outside corner? Don’t worry, our expert and Beissier advisor, Jérémy Poupart, will guide you through the process step-by-step! Discover how to apply joint tape to an outside corner using Prestonett JP, a joint treatment compound in paste form.

6 Essential steps for perfectly applying joint tape to an outside corner

An outside corner, also known as an external angle, is an edge that separates two wall surfaces extending outward. Unlike an inside corner (or a reentrant corner), this angle ranges between 0 and 180 degrees.

Before you start applying the compound, always check the surface. It should be dry, sound, clean, and non-powdery, meaning your site should be watertight and airtight. To achieve this, make sure to fill any holes, drive in any protruding screws, and remove dust. This step is crucial to prevent the compound from blistering, peeling, or forming microbubbles. Jérémy Poupart, Beissier’s technical advisor, explains in this video the final step before painting: applying the joint tape.

Applying joint tape to an outside corner is slightly different from an inside corner. For inside corners, we recommend watching the video “How to Apply Joint Tape to an Inside Corner.”

To achieve a perfect application of joint tape to an outside corner, you will need the following tools:

• Plaster : Our expert uses Prestonett JP compound, known for its smooth application, excellent adhesion, and easy sanding, ensuring perfect tape positioning.
• Two taping knives: One 20 cm wide and the other 10 cm wide, which help in securing the joint tape firmly against the corner.
• Joint tape: It can be reinforced, paper, or mesh. Jérémy uses reinforced tape, which provides extra protection against impacts.

Now you can begin applying your joint tape to an outside corner. Carefully apply the Prestonett JP compound into the corners on both sides using the two taping knives pressed against the corner. Then, cut your reinforced tape and place it along one side of the wall edge. Press firmly after positioning each side of the corner and cover wet-on-wet again with the Prestonett JP compound. Repeat this process for all outside corners in your room. Let it rest for 6 hours and then apply a wider finishing coat over the previous layer to complete your tapes.

Allow it to dry for 24 hours, then sand with 150-180 grit sandpaper. Dust off with a cloth or sponge before starting the full compound application before your final finish (painting, etc.).