Can you use plasterboard for window jambs, reveals, sills?

[elbow]

hey guys - i've been here asking a few related questions and some of the helpful answers are now leading me to this question.

I had new PVC windows fitted but i refused to have any timber surrounds.

After browsing the internet, most suggestions are to use plasterboard - But now it has been pointed out that any moisture resting on the plasterboard is not healthy so i would like to ask for advice on what i should use/do?

There are also suggestions to use insulated cavity closers, but i cant see how i would fit them as the windows are attached to the outside wall (double-brick). I don't want to use wood anywhere - Can i use PVC or something moisture resistant instead of the plasterboard?

As always, your help is massively appreciated and my hurting head will be forever thankful 🙏🙏😁

[Nailbag]

Both the corner edge to the several and up to the window frame @elbow . Clean finish that your plasterer can sort as its a pretty standard finish this days.

[Nailbag]

Shouldn't be an issue at all @EricL @elbow to have the edge finished without any timbers. The corners/edges like any other corner plasterboard edge are reinforced with external metal angles. Of course if they get a good knock they will be damaged just like any other edge. This is a standard edge for any plasterboard finish square-set or not.

[JoeAzza]

Hi @elbow, all great suggestions in resolving your window surrounds, after reading all the comments, you certainly do not want to use timber , especially going to to expense of using pvc windows, I found some websites that use and supply pvc reveals, please see attached, I have also attached a pvc edging  if you want to go the way of rendering and hard plaster.

https://www.upvc.com.au/products/reveals

https://www.networkbuilding.com.au/shop/pvc-reveal-trim-60mm-3-5mm-build-3000mm/

https://youtu.be/jWa0R8PeiAg?si=lIe5od1rzQhsiOtQ

Hope these will help you to decide.

[elbow]

super awesome, thanks for the links and advice 🙏