mdf or plywood for walls?

[norrbottenstorpet]

4 mm + 6 mm ROT plasterboard = 10 mm...

Such thin layers... does the plywood serve any function at all? And weren't you supposed to glue between the sheets then?
Isn't there a risk that 6mm plasterboard easily breaks?

I don't think it's a big problem. Adhesive before screwing would probably make it really sturdy. Sure, there's less to screw into than 12+13 mm, but I'm convinced it holds. There are plenty of walls with just single plasterboard, so certainly 4 mm plywood and 6 mm plasterboard would work. Also, if you only have a total of 10 mm to work with, what other options do you have? It's certainly not particle board or MDF as a base for wallpaper anyway.

 

[Yrrol]

I'm still considering 9mm plywood, which is painted and filled... what benefit do I have from putting double boards on these small gaps when the rest of the house is masonite, the painter must still take into account the majority that remains.

 

[zsimpey]

why are you asking on the forum when you've already made up your mind? plywood is not a good material for the purpose. not for hanging the wallpaper on.

 

[MathiasS]

Spackling on plywood. It sounds completely crazy.

Of all the crazy options in this thread, I think 4mm plywood + joint compound sounds the least crazy. If you put up the plywood, spray glue (like with the ketchup bottle) over the sheet, and then screw on the renovation plasterboard, you'll get a very stable combination that also won't make the painter curse.

When you renovate the rest of the house, the hardboard will be removed there as well. It's the 2000s we live in now.....

 

[Yrrol]

but you don't hang the wallpaper on the wood, there's both paint and filler in between.. the wallpaper doesn't know what's behind these layers?

and I hadn't decided beforehand, I had read old forum posts and back then plyfa was the recommendation among those suggestions..

 

[Yrrol]

So, 3mm plywood and 6mm gypsum... are there only good experiences with this? Sounds so flimsy that the gypsum is likely to flake as soon as you accidentally kick the board, heh

 

[FredrikR]

You should apply a wide coat of filler to everything before putting up wallpaper or painting, right?
But I still don't understand..

The fact that everyone suggests drywall can't just be a coincidence

 

[Yrrol]

History;
When I got the house, it was well-smoked in. One or two layers of wallpaper... we have now sealed and painted 3 times with 2 different types of paint... then the full-surface spackling began along all the walls...

but then I went crazy and tore down some boards to move/add windows.
(that is, one wall needs 1½ boards, one needs 2 boards, one needs 2½ boards)

So the majority is masonite, with old wallpapers, and several layers of paint and spackle... now I just need to patch the holes and prime as well as spackle to get a smooth, cohesive surface.

----
The fact that everyone suggests plaster could also be because the new generation doesn't know anything else, like a spreading rumor, a standard answer...

I've shown my interest in mixing plyfa and plaster, but I've taken into account the warnings I've read about thin layers, hoping to be convinced by someone but nahhh...

Those who suggest plaster rarely consider the max 9.8mm dilemma.

 

[FredrikR]

10mm chipboard?
The new generation that doesn't know any different, but haven't thought of such good materials as MDF and Masonite, you mean?
Besides, if it's just a wall, what does it matter if it becomes a little thicker?
You're probably going to install new casings and moldings anyway, right?

 

[Yrrol]

Well, but I don't have trim and lists at every joint... imagine it's in the middle of a wall.. I'm forced to plaster the existing boards so it matches (though I actually think there's so much stuff on them that they're thicker than 10).

 

[Danne031]

Knock down a bit more instead so you can at least replace one wall at a time, so to speak. Patching and repairing with questionable materials mixed with the original (which is also borderline crap), will turn out bad.

There is no better surface junk than gypsum. Period.

I have masonite, mdf, and treetex throughout my house (had, it's all being replaced gradually). All of them are a pain to work with and to work on.

 

[Tiger79]

Renovation gypsum is durable...

Put it throughout the house and avoid cracks and blemishes in wallpaper and paint...

 

[FredrikR]

As Danne031 says, replace the panel material on an entire wall, so you can avoid potential issues with thickness differences.

 

[Yrrol]

I have a big house and this is like one or two records in every room... To then have to tear down and rebuild all the walls in all rooms, then we're talking expenses, haha

 

[FredrikR]

You haven't put new windows in all the rooms, have you?
Sheet material is not so bloody expensive. Maybe worth a few extra bucks to save on painter/spackling time/cost?
So that the walls you've torn down/made changes to have the same thickness.