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I was asked to get some information concerning installing magnesium oxide wallboards. It's a material I just got to know and never worked with, so I want to learn what are requirements for installing these, specifically:

  1. Do I need to make special expansion joints, and - if so - what material is best for to fill the gap?
  2. If expansion joints are not needed - if I fix several of these with some kind of glue (or other compund) so they will form a larger surface - do I need to make some expansion joints then?

My question is about indoor-related works as these wallboards are seens as a substitute to drywall. Any related info (e.g. install manuals) greatly appreciated.

I need answers from hands-on experienced DIY-ers best. These wallboards aren't popular where I live, so I try my luck here, in DIY SE :)

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    I have only used for a tile backer on walls I usually fill the gap with morter. there is a fiberglass mesh/ tape that could be used in the edge depression and filled like sheetrock but I have no idea how you could sand any high spots, probably best used with a heavy texture or "stomp" pattern – Ed Beal Dec 1 '15 at 14:18
  • @Ed Beal So it just looks like a drywall-way. I was guessing that it can be done like that. Thx for Your input. – Marek Oleszczuk Dec 1 '15 at 14:20
  • I'd never heard of this product. In looking it up, I found this article that might be informative for any other MgO noobs. – JPhi1618 Dec 1 '15 at 14:32
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The best place to go for this sort of question is the manufacturer. I deal with National Gypsum, USG, and others ALL THE TIME for questions like this. Typically, the manufacturers web site will have all the design criteria you could ever want - if they don't, I would look for another manufacturer who took the time to make that information available. These guys are generally very willing to help as a seccusful installation always looks good for them. Give them a call.

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