Crack between two plasterboards, what do I do?

[EddieHansson]

You mean when drywall panels are missing the original edge? One usually bevels such edges at 45 degrees, do you mean to smooth the bevel with filler and then glue the tape? There's a bit of technique to taping such joints otherwise.

That's how I do it. Works well and becomes very strong. I tested on loose panels before installation and paper glue+tape is _much_ stronger than just filler+tape under breaking forces.

 

[Elnovis]

You should use wetroom glue when gluing paper strips, as there is a risk of peeling when using regular fabric glue, which I've experienced in the past!

By the way, it's a very rough finish, depending on the raking light, everything will show through your photo wallpaper!

Tap with your fingers to hear if there's air behind the strip. Spackle once, glue a new strip with wetroom glue, spackle, and paint. If there's air behind, cut it open.

I know it looks rough, but the plan was to sand with finer paper, but I discovered the crack before that.

 

[EddieHansson]

I know it looks rough but the idea was to sand with finer paper but I discovered the crack before that.

You might need to fill in a bit behind to make the base solid and then redo the seam.

 

[Kristofferm]

The foam trick I mentioned is insanely simple and has always worked well for me. I recommend it.

 

[Elnovis]

The spray foam trick I mentioned is insanely simple and has always worked well for me. I recommend it.

Would it work with PL600 instead of spray foam? Otherwise like your description.

 

[Lechuza]

You mean when drywall panels are missing the original edge of the panel? You usually bevel at 45 degrees on such edges, do you mean smoothing the beveling and then gluing the tape? It's a bit of a technique to apply tape on such joints otherwise.

Exactly, usually cut them, plaster once, then glue tape on the cross joints. Of course, you can plaster the cross joints with j plaster too, I've done that on recent jobs but it requires technique and can easily become a big bulge if you're not skilled enough.

 

[Kristofferm]

Would it work with PL600 instead of foam sealant? Otherwise, as your description.

No, PL doesn't expand. The whole point of the foam sealant is that it expands and fills the void. To get PL in, you'd probably need to cut along the entire joint so you can insert the nozzle and apply enough PL to get it everywhere underneath, then fill in with gypsum putty. Something like that.

 

[Elnovis]

No, PL does not expand. The whole point of the foam is that it expands and fills the void. To use PL, you would probably need to cut along the entire joint so you can insert the nozzle and spread enough PL to get it everywhere underneath, then fill in with gypsum plaster. Something like that.

Ok, then I'll try the foam.

 

[EddieHansson]

Good luck. Feel free to post with pictures of how you're doing it and how it turned out.

 

[Kristofferm]

Managed to find a video that shows the technique. Not the best and most educational but, oh well.

 

[Elnovis]

Managed to find a video that shows the technique. Not the best and most pedagogical one but, oh well.

[media]

Thank you very much. Looks simple.