304,718 views ·
348 replies
305k views
348 replies
Why does everyone use OSB behind drywall?
I actually think that anything other than "stone" walls is pretty bad.
Down here and in the basement, it's only that kind.
Exactly what I don't know.
Leca in one place, hollow blocks in another, brick around the chimney.
But since I didn't tear everything out upstairs, I continued the easy way with wood materials.
Down here and in the basement, it's only that kind.
Exactly what I don't know.
Leca in one place, hollow blocks in another, brick around the chimney.
But since I didn't tear everything out upstairs, I continued the easy way with wood materials.
Wonder how many have torn out fine old råspont and replaced it with newer material consisting of sawdust and glue?
*clears throat*
Felt it was wrong many times but råspont and nailed masonite/tretex aren't great either.
*clears throat*
Felt it was wrong many times but råspont and nailed masonite/tretex aren't great either.
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· Göteborg
· 11 188 posts
...but that was then. Today, chipboards sold in Swedish building supply stores have hardly measurable levels of the "chemical dirt" of the past. Råspont is naturally the best in this context. However, I find it difficult to see why one should place a material that moves behind an absolutely rigid material like plaster.Fotografen said:OSB is a cheap disposable board, not intended for any permanent structures but for temporary use during the construction period. With råspont, you avoid glue and dirt that can emit gases. I remember the smell of chipboard glue on the upper floor of the townhouse I grew up in during the 70s, chipboard in walls and ceiling.
Even though it is incredibly nice to avoid messing with plaster plugs, plaster expanders, plaster anchors when you want to put something up.
If you have something behind the plaster, you just need to drive in a screw or nail, and it's done.
If you have something behind the plaster, you just need to drive in a screw or nail, and it's done.
The question might not really be why you should specifically have OSB behind the drywall (even though that's the headline), but why everyone builds with some form of more stable board behind the drywall. As mentioned, it can be anything from OSB, particleboard, ply, rough paneling, or another layer of drywall.
Personally, in the few instances I've built new interior walls, I've used both OSB and reused old rough paneling. The downside of rough paneling is that it takes much longer to install (even with a brad nailer) than a fiberboard. However, I'm all for spending a few extra thousand on a house worth a couple of million and installing a stable board behind the drywall.
Personally, in the few instances I've built new interior walls, I've used both OSB and reused old rough paneling. The downside of rough paneling is that it takes much longer to install (even with a brad nailer) than a fiberboard. However, I'm all for spending a few extra thousand on a house worth a couple of million and installing a stable board behind the drywall.
I the existing walls in this house, I've had raw timber boarding and tretex, and now I'm replacing tretex with plasterboard. When building new walls, it will be OSB + plasterboard.
I would never use single plasterboard. I was at a friend's place yesterday, and in his newly produced apartment, there were two holes in the wall where their child gate had been at the stairs. It would never have come off if there had been an OSB board behind it. Sure, you can make things hold even with single plasterboard, but it places much higher demands on the person mounting things.
If you have OSB, or other wood material in the wall, you can more or less screw up anything anywhere.
I would never use single plasterboard. I was at a friend's place yesterday, and in his newly produced apartment, there were two holes in the wall where their child gate had been at the stairs. It would never have come off if there had been an OSB board behind it. Sure, you can make things hold even with single plasterboard, but it places much higher demands on the person mounting things.
If you have OSB, or other wood material in the wall, you can more or less screw up anything anywhere.
And who knows where to screw things up in 10 years when building something new?
Then there's the electrical aspect too.
Today's electricians seem to think it's the best thing to run conduits crisscross as long as it's the shortest path.
With properly adjusted screw lengths, it should be safer with a board or something else behind the drywall.
You avoid drilling and unnecessary long screws into the wall like with molly plugs.
Then there's the electrical aspect too.
Today's electricians seem to think it's the best thing to run conduits crisscross as long as it's the shortest path.
With properly adjusted screw lengths, it should be safer with a board or something else behind the drywall.
You avoid drilling and unnecessary long screws into the wall like with molly plugs.
Mjaa.., A 64" plasma on an extendable arm is probably not something you would put in plasterboard. At least that's not what I advised my friend to do.fn76 said:
I have built some 45mm walls where there was a lack of space. Then I glued OSB to the stud, on both sides. It becomes very stable, and I guess it is equivalent to a 70 stud. The remaining concern is the load capacity per fastening, and there the combination of osb+plasterboard wins over just plasterboard. If you don't glue, the wall won't be as stable at all.fn76 said:
Personally, I think it’s an expensive solution to use OSB throughout the whole house just to hang one or two things that require greater strength. With some planning, you can add extra studs on "TV-walls" and save a lot of money and time. There are already plenty of studs in the wall and with a bit of luck and flexibility, you can take advantage of them for mounting.
Sure, one can view 20-30 kSEK extra for this aspect as not much on a house costing 2.5-3 MSEK. However, I believe there is a high risk that many house builders think this way in many phases and suddenly you’ve spent several hundred hours of your own work and a lot of money on things that "might be good to have" in a house.
Despite this, I will still build with OSB so the house isn't classified as a "jerry-built" by future buyers.
/Krister
Sure, one can view 20-30 kSEK extra for this aspect as not much on a house costing 2.5-3 MSEK. However, I believe there is a high risk that many house builders think this way in many phases and suddenly you’ve spent several hundred hours of your own work and a lot of money on things that "might be good to have" in a house.
Despite this, I will still build with OSB so the house isn't classified as a "jerry-built" by future buyers.
/Krister
Personally, I am happy to pay 20' just to avoid having molly plugs lying around in the toolbox for fastening things heavier than a poster. And now it only cost about 5' to get OSB for the whole house here, so I'm satisfied.
I would never claim to classify a house as a shoddy construction if it lacks OSB. That would immediately rule out almost all houses from well-known house manufacturers, like 10,000 built small houses/year. Not shoddy, maybe words like stingy or sparingly are applicable.
I would never claim to classify a house as a shoddy construction if it lacks OSB. That would immediately rule out almost all houses from well-known house manufacturers, like 10,000 built small houses/year. Not shoddy, maybe words like stingy or sparingly are applicable.
But if you spend an extra 10,000 for OSB just to be able to attach things, you'll need to screw in about 5,000 mollys before you break even on that deal 
I have single drywall in all interior walls, though I did spend a couple of thousand on insulation in these to reduce noise problems. However, I do advocate for double layers of some type, gypsum + gypsum or OSB + gypsum on exterior walls. I have this in half of the house and it dampens quite a bit of noise from outside. On the other hand, we have special windows, drywall returns, and acoustic profiles in the walls, so I don't really know how much the double layers contribute in reality.
I have single drywall in all interior walls, though I did spend a couple of thousand on insulation in these to reduce noise problems. However, I do advocate for double layers of some type, gypsum + gypsum or OSB + gypsum on exterior walls. I have this in half of the house and it dampens quite a bit of noise from outside. On the other hand, we have special windows, drywall returns, and acoustic profiles in the walls, so I don't really know how much the double layers contribute in reality.
Personally, I have simple plaster. But, yeah, I...
Anyway, it's easier for others to put things up, others in the house can hammer a nail into concrete, figuratively. If there's wood behind it.
Then if any child protests by kicking the wall when it's bedtime. But now it might rather be that you might rearrange furniture into the wall.
It feels like I have a few small things planned in the future.
But it was easy, cheaper and went quickly. Worth a little too.
Anyway, it's easier for others to put things up, others in the house can hammer a nail into concrete, figuratively. If there's wood behind it.
Then if any child protests by kicking the wall when it's bedtime. But now it might rather be that you might rearrange furniture into the wall.
It feels like I have a few small things planned in the future.
But it was easy, cheaper and went quickly. Worth a little too.
Just under 20 thousand was the cost when I bought OSB for all the walls in my house of about 175 sqm (all walls except in the bathrooms).
And now all the walls are incredibly stable, I would have regretted it terribly if I had skimped on it.
Sure, it takes some extra work to put up OSB everywhere, but you get a lot back when the drywall goes up. (you don't need to consider where the studs are when installing the drywall.)
And now all the walls are incredibly stable, I would have regretted it terribly if I had skimped on it.
Sure, it takes some extra work to put up OSB everywhere, but you get a lot back when the drywall goes up. (you don't need to consider where the studs are when installing the drywall.)