Hello
I am in the process of installing walls in my new bathroom and plan to use OSB+wet room gypsum as a base for the tiles.
I went and bought this the other day and said I would use it for the bathroom and assumed I got OSB3... since someone said that is what you should use.
But today when I start putting up the boards, I see that it says OSB2 on them :-?.
So, my question is, can I just as well use OSB2?
I only know that OSB2 is supposed to be a bit "simpler" in its design? Whatever that means...
I didn't choose OSB to screw a bunch of stuff into the walls but rather to be able to glue it to the studs to get a sturdier wall?
What really is the difference between 2 and 3 in this case? And perhaps most importantly, is there any difference specifically for a bathroom wall?
I have searched the forum but can't find answers to my questions...
So now I am hoping for the vast collective knowledge that exists here on the forum!
Regards, Micael
I am in the process of installing walls in my new bathroom and plan to use OSB+wet room gypsum as a base for the tiles.
I went and bought this the other day and said I would use it for the bathroom and assumed I got OSB3... since someone said that is what you should use.
But today when I start putting up the boards, I see that it says OSB2 on them :-?.
So, my question is, can I just as well use OSB2?
I only know that OSB2 is supposed to be a bit "simpler" in its design? Whatever that means...
I didn't choose OSB to screw a bunch of stuff into the walls but rather to be able to glue it to the studs to get a sturdier wall?
What really is the difference between 2 and 3 in this case? And perhaps most importantly, is there any difference specifically for a bathroom wall?
I have searched the forum but can't find answers to my questions...
So now I am hoping for the vast collective knowledge that exists here on the forum!
Regards, Micael
It probably doesn't matter which OSB board you use. But you should NOT use gypsum behind the tiles. The gypsum will eventually become moist, leading to growth and odor problems as a result. This is regardless of what the building suppliers say, so NOT gypsum. You should have minerit or a similar cement-based board that cannot grow mold. Gypsum boards have paper, and they cannot handle a moist environment.
Not gypsum, not gypsum, not gypsum, not gypsum, not gypsum. Additionally, you should not have any plastic behind the exterior walls in the bathroom.
Tartan
Not gypsum, not gypsum, not gypsum, not gypsum, not gypsum. Additionally, you should not have any plastic behind the exterior walls in the bathroom.
Tartan
I have also never reflected on different qualities of OSB, so it should matter less! Feel free to glue screw to the studs, it will be stable.
Regarding tartan's post, he may not be directly "wrong," but the common method is, after all, to use plasterboard behind tiles. Maybe it's not entirely optimal, but with a well-executed job with waterproof insulation (tätgukka), potential moisture problems should never arise! The next generation of bathroom builders will surely use brushed acid-resistant stainless steel as a substrate, but I shower safely with a lot of gukka
Regarding tartan's post, he may not be directly "wrong," but the common method is, after all, to use plasterboard behind tiles. Maybe it's not entirely optimal, but with a well-executed job with waterproof insulation (tätgukka), potential moisture problems should never arise! The next generation of bathroom builders will surely use brushed acid-resistant stainless steel as a substrate, but I shower safely with a lot of gukka
Sending a link where you can read about the OSB board.
http://ljungberg.se/webb/Fotogalleri.nsf/LookupFiles/broc_osb/$file/broc_osb.pdf
/ Helena
http://ljungberg.se/webb/Fotogalleri.nsf/LookupFiles/broc_osb/$file/broc_osb.pdf
/ Helena
Thanks for the reply!
I'll go ahead with my osb2, and the wet room gypsum board I've already bought...
If I could afford it, I would have loved to use minerit instead :-/, but, oh well...
And of course, no plastic on the exterior walls... (Finja ergotherm...).
But I'm still not much wiser when it comes to osb2 or 3?
Best regards, Micael
I'll go ahead with my osb2, and the wet room gypsum board I've already bought...
If I could afford it, I would have loved to use minerit instead :-/, but, oh well...
And of course, no plastic on the exterior walls... (Finja ergotherm...).
But I'm still not much wiser when it comes to osb2 or 3?
Best regards, Micael
What nonsense, not having gypsum behind the tiles? If you have a moisture barrier behind the gypsum according to all the rules, there are no problems. Minerit is used in extremely humid environments, like in basements, so you don't get moisture and mold on the back of the boards, etc.
tartan said:
Unfortunately, kakelmaster, I believe this is flawed reasoning. Recent research findings and tests at SP show that moisture is capillary absorbed into the grout of tiles, only to remain trapped behind the tiles. This moisture does not dry out, but instead continues to cause dampness. Regardless of how well the waterproofing layer has been applied, over time, the moisture will penetrate the drywall and mold will eventually form on the paper of the drywall.
For your information, I am educated in this area. It is then up to each individual to make their own decisions. Minerit board or equivalent is the only material today that does not show mold growth after being exposed to moisture.
An important thing to keep in mind is to always maintain a certain level of negative pressure in the home, to prevent moisture from being pushed into the walls of the rest of the house as well.
Tartan
For your information, I am educated in this area. It is then up to each individual to make their own decisions. Minerit board or equivalent is the only material today that does not show mold growth after being exposed to moisture.
An important thing to keep in mind is to always maintain a certain level of negative pressure in the home, to prevent moisture from being pushed into the walls of the rest of the house as well.
Tartan
Strange then that it is approved to use plaster and plasterboard in bathrooms, there will be a lot of work in the future and that is good for me ;D
tartan said:
And if you want to be on the safe side, you don't build a bathroom but bathe in the stream outside... Then you have no moisture problems at all... Moisture causes problems, period, but you sure as hell don't need to go so damn overboard. But, of course, you could cast the entire bathroom as a gigantic silicone blob, hollow it out, smear on some tiles, and voila, you have both a bombproof and moisture-proof bathroom... If there is such a thing...
Now we tilers don't do much demolition, we leave that to the builders
tartan said:
In the States, it's popular to have plastic stalls in the shower area, like in the cabins on the Åland ferries, maybe that's the future.
mr Z said:
Pie throwing was not my intention, but you can't confuse people by saying not to use drywall when everyone is using it more or less. I receive ongoing information about new regulations all the time through the association and haven't heard anything about your reasoning. The tiling company I work for has been around since the 1930s and was involved in starting the association. But you might be right, and time will tell, but for now, we'll continue with drywall. The materials can't be too good, or else we'll be out of work ;D
as I said, I would have gladly used minerit if the economy allowed...
But on the other hand, I was thinking of tiling myself as well, so tile master, you won't get more work even if I use gypsum...
I guess I'll have to hope that when the mold growth on the gypsum becomes apparent, it's time to change the tiles anyway ;D
micael
But on the other hand, I was thinking of tiling myself as well, so tile master, you won't get more work even if I use gypsum...
I guess I'll have to hope that when the mold growth on the gypsum becomes apparent, it's time to change the tiles anyway ;D
micael