Use That Center Crease For Drywall Plaster Tape

 

Inside Corner Folding Trick

Inside corners scare a lot of people. Tape won't stay straight. It wrinkles. It floats off to one side.

 

But here's the thing: your flexible drywall joint tape already has the answer built right in. See that faint line running down the middle? That's not decoration. That's your fold guide. drywall plaster tape features a factory center crease designed specifically for perfect inside corner installation, saving time and eliminating common finishing mistakes.

 

Why the crease matters

That center line is exactly where the two walls meet. Fold the tape along it, and you get a perfect 90‑degree channel – every time. No guessing. No measuring. Just fold and stick.

 

How to fold it right

Lay the tape on a clean surface, crease side up. Fold it lengthwise so the two halves come together like a book. Run your thumb along the crease to sharpen it. You don't need to soak the tape. A dry fold works fine – the compound will wet it out later.

 

Angle control – keep it honest

The tape wants to spring open a little. That's fine. When you press it into the corner, use a corner knife (not a flat knife). Push the tape into the angle so both sides make full contact with the drywall. The crease keeps the tape centered. You don't have to fight it.

 

Symmetry – both sides get the same love

Spread compound on both sides of the corner before you press the tape in. About 2 inches wide on each side. Then bed the folded tape. The compound should squeeze out evenly past both edges. If one side pushes out more mud than the other, your tape isn't centered. Pull it off, refold, and try again.

 

Compound width – don't go skinny

A common mistake: spreading compound only as wide as the tape. That leaves the edges of the tape sticking up. You want compound to extend about an inch beyond each edge of the tape. That gives you room to feather later. For the first coat, a 4‑inch total width (2 inches per side) is plenty.

 

Pro move – one continuous motion

Load your corner knife with compound. Start at the top of the corner and pull down in one smooth pass. The knife rides the corner and presses the tape into both walls at the same time. No need to go back and forth. One pull, then let it dry.

 

After it dries

Scrape off any ridges with a clean knife. Then a second, wider coat – 6 to 8 inches total – to feather the edges. Your inside corner will look sharp, straight, and ready for paint.

 

That little crease on your drywall plaster tape isn't an accident. Use it, and inside corners become the easiest part of your day. Master this simple folding method to get crisp, professional corners every time with drywall plaster tape.