dumb query:Do we really need to fill plasterboard joints?

[xelaris]

Normally we need to fill plasterboard joints if we like to see a plain wall which is going to be painted...but what if we are planning to use wallpaper or plastic panelling?
What if we fill the gap (if any) between plasterboard with low expanding foam (sanding it) and then PVC on top (to prime the surface) and the wallpapering?

 

[xelaris]

no provocation involved here....just a basic question - too basic perhaps? Or too annoying to many in the plastering business?
Maybe, I should post it somewhere else in this forum?

 

[roy c]

post it in decorating...

 

[Burnerman]

It'll show up like a sore thumb mate - fill those joints as normal.
John

 

[roughcaster]

For a decent job, always fill/tape the joints/screwheads first if you're going to paint or paper. Give the newly taped walls a sand down then you're ready to go. DON'T PRIME THE WALLS WITH PVA,,, use "MATT EMULSION".

 

[xelaris]

First of all, thanks for all useful replies and tips...as you noticed here is a case of someone who's never used plasterboard before nor competent in drywall in general who's reluctant to go and buy proper joint filler and try to use what's around the house at the moment.

Let's say, some particularly thick textured wallpaper is going to be used...the filling with expanding foam is flush with the rest of the wall - why bother using joint filler if the final product looks smooth and neat? That's a supposition cos' I haven't started the job yet.
I was expecting some other replies maybe around the technical/mechanical importance of joint filling...
Any consideration about the type and use of the wall? some walls are more prone to movements others are never going to be fully exposed to the eye nor to movement (e.g. under the stairs in my case).

 

[deandiy61]

use Easifill. It's expensive compared to an ordinary powdered filler but cheaper that buying more plasterboards after rubbing too hard.