Plaster or not

nothing wrong with doing that, but you'll still need to skim over the taped joint, just painting over it will look ''interesting''

not sure what type of tape you propose using but it needs to be a proper open weave scrim type

http://www.screwfix.com/p/no-nonsense-plasterboard-joint-tape-scrim-48mm-x-90m/68520

 

no problem there - you just need a wide taper on the filling - do a search for the Gtec Siniat drywall manual as it give a reasonably detailed process within

 

You could probably manage to rough the joint up with a rasp file and flexible filler it(paintable filler of course). Perhaps slide a wet trowel down it for a perfect finish.

Mr. HandyAndy - Really

 

Hi Gordy.

If you have a light source from, say, a window that falls at an acute angle along the wall, don't be surprised if it'll show up the filler 'taper' over the raised scrim. Fair chance that won't be the case as it's in a loft conversion, though, so you might be ok?

Ok, I'm gonna be shot down for suggesting such a cowboy thing as this, but I'll chuck it in here as it's something I've done myself many moons ago and got away with it... I did the same as you - bought square-edged p'board for a room I was updating, as I hadn't even realised there was such a thing as taper-edged at the time . And as I'd never done any skimming before, I wasn't prepared to learn for the sake of one wall.

So, my solution was to PVA the p'board edges together as I fitted them, butting the papered edges together tightly. I then ran another smear of PVA down each join to be sure to be sure, and wiped off the excess. That effectively glued the sheets together. All that was then needed was a very thin skim of filler to fill the wee groove and join in the paper edge. Light sanding, completely flat finish, painted, and when I left that place years later, no cracks had appeared.

YEEEEEEEE-HHAAAAAAAAAA!

 

Blow all the faffing about - just ''whip on a skim'' OP.

 

... after PVA-ing the join...

 

I suppose re-iteration is indicated DA, and thanks for pointing out said - although I think the geezer is already aware of the fact that the joints must be scrimmed.

Scrim up and ''whip on a skim'' - dunno about PVA'ing the scrimmed joints before skimming - i've never done it, and can see no plaster degradation after what some 10 years.

 

JP, I'm not saying it's the right way to do it, or even an alternative way. In fact, it has 'cowboy' written all over it .

But, all I am saying is that I tried it once for the same reasons as Gordy, and it worked.

The OP is trying to avoid a complete skim - I guess because he hasn't done it before, or wants to save money. So, if he instead goes the 'scrim and feather-fill' route, I think he'll find it a 'mare as he'll very likely expose the scrim when sanding it all down (because you really want the filler over the scrim to be as thin as possible). Or he'll damage the plasterboard surface paper around the filler when sanding. And he'll likely have to add more filler in places.

And then he'll still notice the raised bit over the scrim when it's all painted.

I'm not saying that my Mickey Mouse method is the solution, only that it did work for me.

 

tape and joint it, will be cheaper and cleaner lol