Gap filling when applying a plasterboard to an uneven wall.

[noseall]

So you definitely rate the foam over any kind of hard setting powder then?

That depends. We use both, but prefer to use dry wall adhesive. It's just more practical, from a plasterers point of view. Especially with out of plumb walls.

 

[lc155]

That depends. We use both, but prefer to use dry wall adhesive. It's just more practical, from a plasterers point of view. Especially with out of plumb walls.

On timber studs? I did ask Knauf about using their adhesive for doing this, but they firmly recommended against it, presumably because the movement of the studs will crack it off the timber, and then it is only being held by paper.

 

[noseall]

On timber studs?

Eh?
Screw to studs, innit.

 

[lc155]

Eh?
Screw to studs, innit.

Except the parts where there are voids due to uneven studs, so you're filling the gaps to keep the boards firm.

 

[Brigadier]

One of the (many) things I don't "get".....

...why, when someone goes to all of the trouble of installing vapour membranes, taping joints, and the like, is it then ok to screw straight through it - in multiple locations - to actually fix the boards?

Is it just that the screw holes are inconsequential in the grand scheme of things, or just realistically unavoidable (i.e. "least worst of the options")?

 

[lc155]

One of the (many) things I don't "get".....

...why, when someone goes to all of the trouble of installing vapour membranes, taping joints, and the like, is it then ok to screw straight through it - in multiple locations - to actually fix the boards?

Is it just that the screw holes are inconsequential in the grand scheme of things, or just realistically unavoidable (i.e. "least worst of the options")?

Generally you can use butyl tape which self seals around the screw and is your best bet at keeping things actually sealed.

However, the whole idea of insulating internally is a compromise. All your vapour barriers and so on will fail over time (micro holes in the plastic, tears when renovating, etc) and will let issues in. In colder countries, we really should ideally be insulating externally, period. That way you don't need to deal with any of this crap, it's all done on the outside, and moisture on the inside is collected via air extraction systems.

Of course that costs a bomb when not doing it on new builds, so that's why we compromise with internal insulation. But, as energy efficiency standards get tighter and tighter, these small issues that can be ignored in a regular renovation become much bigger deals as they make a bigger impact on the performance you get.