Corner guard for exposed corner, Plaster.

[Alimaj]

Hello!

This will be my first post on this eminent forum!

I've searched through the threads but couldn't find one that fits my question, so I took the liberty of starting a new topic.

So, I've been wondering how to handle these steel profiles that need to be embedded to provide protection against impacts and bumps when you have exposed corners of gypsum.

• Should you carve out the corresponding thickness (0.5mm) of the profile in the gypsum so that the profile is recessed?
• Or should you place it directly on and then wide-spackle the height difference with as wide a spackle knife as possible?
• Or is it intended to be used on the beveled edges found on gypsum boards, i.e., two bevels forming a corner, then corner protection, and finally spackle?

Best regards,

Alimaj

 

[oceanis]

Alternative 2. Direct on and full-surface filling.
That is why there is a small "edge"/elevation in the actual corner, it forms support for the filler and is just high enough for the filler to cover the screw.

 

[RoBo]

The steel profiles are not good if you have chipboard or OSB behind the gypsum. There will be too much movement causing cracks and they detach within two years. There are very good paper corners instead.

 

[Great]

I have used Gyproc's steel profiles, which are installed with their tool (Gyproc's own), and I found them to be super good if you fasten them closely.

I found Byggmax steel profiles less good considering how to fasten them. I fastened them with adhesive and long drywall nails, albeit on non-recessed edges, so it required quite a bit of spackling.

Lastly, I used Gyproc's Aquabed, which you only spray with water from a spray bottle and press into place, super smooth.

Regarding recessed corners, I would recommend, if possible, placing the profiles in the recess. It results in significantly less spackling...

 

[Janus82]

Steel profiles are not good if you have chipboard or OSB behind the gypsum. The movements are too large and they crack, causing them to come loose within two years. There are very good paper corners instead.

That sounds a bit worrying.
I'm currently renovating two rooms where I'm going to apply corner protectors over OSB+Gypsum. Has anyone else experienced the same thing as RoBo, that steel profiles crack after a couple of years under those circumstances? I would prefer the room to look nice even in a few years.

 

[bjomape]

I'm in the same situation. A friend who is a house carpenter also warned me that the usual corner protectors that you screw on easily lead to cracks after a couple of years. He recommended instead a corner profile that you press into the putty. It doesn't seem to be as common, but I've just managed to find out that Colorama here in Gothenburg sells it. Probably other large paint stores have it in their assortment as well. I will use that instead.

 

[Great]

I installed gyprocs on the ground floor, built 6 years ago, with chipboard and plasterboard, and not a single place has cracked or shown any signs of wear. Admittedly, the framework stood for a couple of years before, so everything likely settled in, and I covered everything with microlite.

 

[noone70]

As I said, I used gypsum board on the lower floor, built 6 years ago, with chipboard and plaster, and not a single place has cracked or shown any signs, although the framework stood for a couple of years before, so everything had settled, and I also applied Microlite on everything.

2.5 years and not a crack... both new walls with gypsum on OSB and old walls with gypsum on plank walls. We have also afterwards excavated the basement with accompanying vibrations and shaking in the house.

 

[Alimaj]

Thanks for all the answers!
Now I've got a bit more to go on.