[matt151617]

Looking to fix this strip in a cape cod house at the peak. The angle is maybe around 20 degrees? It's fairly shallow. The strip is some type of tough material, definitely thicker than regular drywall tape, and 2 1/2" wide. I pulled it down slightly in March, pushed joint compound in the whole length, and pressed it tight, then smoothed additional joint compound over the top. It looked ok and held until late May when it got hot out.


How do I fix this so it doesn't come off again?

 

[XSleeper]

You need to rip all the old tape off and start over. They likely used a product like Strait-flex. You should use the same thing, but you should prefill any gaps before taping with Durabond 90. Once the prefill is dry, bed the tape in Durabond 90. Note that you can't sand Durabond, so dont leave any humps of it anywhere.

Once it has dried, skim coat over the Strait-flex with regular joint compound. If you dont like the sharp crisp angle, you can fill and round it with a coving knife.