OSB and drywall

[Ghost79]

How well does a 12mm OSB and a 6mm gypsum board insulate? The reason is that I am removing an old insulation from the inner/outer wall that is 12mm thick. Behind it, there are 2 by 7 studs assembled into a wall.

Now the question is what to do with the insulation against the outer wall versus the inner wall. The wall becomes much thicker (45x70 stud, OSB, and gypsum) and it's not ideal for windows and door frames with a wall that sticks out 7-8 cm or thereabouts. Just OSB and gypsum against the walls work well as it can be complemented with a trim where they stick out. Do I need to go with insulation or not?

I'm a rookie for the record...

Suggestions for solutions are gladly received.

 

[Stefan N]

The insulation value is just above zero.
But another thing, do you have to use 6mm gypsum? It's not very suitable for use on OSB and it's twice as expensive.

 

[hantverkare1]

How well does an OSB 12mm and a 6mm plasterboard insulate?
The reason is that I am removing an old insulation from the inner/outer wall that is 12mm thick. Behind it, there are 2 by 7 studs joined to a wall.

Now the question is how should I deal with the insulation against the outer wall versus the inner wall.
It becomes quite a lot thicker wall (45x70 stud, OSB, and plasterboard) and it's not that good with windows and door frames with a wall that sticks out 7-8 cm or thereabouts.
Only OSB and plasterboard against the walls work well as it can be complemented with a trim where they stick out. Do I need to use insulation or not?

I'm a rookie for the record...

Suggestions for a solution are gratefully received.

Osb and plasterboard do not insulate anything. Or if we are to be precise, they insulate a little, but you can disregard that in this case.

 

[Ghost79]

The insulation value is just over zero.
But another thing, do you have to use 6mm gypsum? It's not really suitable for OSB and it's twice as expensive.

Why not renovation gypsum on OSB?
I also have 2x7 wooden studs behind the OSB, so it becomes sturdy to screw things into.
Renovation gypsum weighs much less and is easier to handle.

 

[Stefan N]

It's so thin that it flexes at the slightest unevenness behind it.

 

[Janus82]

You write that the wall consists of "2 tum 7". What does that mean? Is it made of 7 inches (17.5cm) of solid wood or is it just 5cm of wood? Regardless, it might be a good idea to add some insulation to improve the indoor climate and heating economy. Even 45mm of extra insulation will make a noticeable difference.

Regarding renovation plasterboard or regular plasterboard, I agree with everyone else. Use 13mm plasterboard if you have a choice. If you want easier-to-handle sizes, you can choose boards that are only 90cm wide. It will mean more seams to fill, but you will surely manage that.

 

[SBH]

Why not renovation gypsum on OSB? I also have 2 by 7 wooden studs behind the OSB, so there are solid things to screw items into. Renovation gypsum weighs much less and is easier to handle.

don't like thin gypsum. they break so easily.

 

[Ghost79]

It's so thin that it flexes at the slightest unevenness behind it.

Aha, but osb are smooth..

 

[SBH]

Aha, but osb is smooth..

really fine osb if you got smooth ones.

go with regular drywall, reno, you don't gain much with renovation drywall

 

[Drömhus2012]

The insulation value is just above zero. But another thing, do you need to use 6mm plasterboard? It's not very suitable for use on OSB and it's twice as expensive.

In my building supply store, the difference is no more than 50 öre between regular and renovation plasterboard, but I haven't checked the store price since it's with my discount. Upon further thought, it was probably over a year ago that I asked for the price, but the difference shouldn't have increased so significantly. Otherwise, I agree that it's preferable to use standard plasterboard, partly because they break so easily and partly because they hide unevenness better.

 

[Stefan N]

Then you have very good prices on renoveringsgips, normally the difference is about 30%.

 

[Drömhus2012]

Then you have a very good price on renovation plasterboard, normally there's about a 30% difference.

Or I'm paying an overprice on standard plasterboard

 

[Avemo]

What is the purpose of the OSB board in that location? Can't you just put regular drywall directly on the plank wall?

 

[Locke]

Plank walls are usually a bit crooked. OSB evens it out a bit. You can also put double plasterboard.

I only put single plasterboard, but you need to be sober when screwing it in.