Packing out timber stud wall

[mljbme]

I've moved an old Victorian door from one stud wall to another in a house in the UK. Rather than faff about trying to patch repair the lath and plaster walls, I've just ripped them back to the timber frames. I have 12.5mm acoustic ply to affix. I'll get this skim coated, which I understand will only be 2-3mm thick (say 2.5mm for ease of the calculations that follow). The old Victorian door liner sits 25mm proud of the studs. I'll also reinstate the old 20mm thick architrave. 12.5mm plasterboard + 2.5mm plaster = 15mm so the liner would still be 10mm proud of this. My initial thought was just to pack a strip behind the architrave but then the frame (architrave) would appear to be 30mm deep (20mm architrave + 10mm packing strip)... which I think would look chunky and out of place. I'd have the same issue with the skirting. Is the best solution to use 9mm ply to pack out all the timber studs and noggins? If so, what type of ply (structural, non-structural, marine). This is on the bedroom side of what will be an ensuite bathroom. I'll also need to pack out the other side but using tile backer board in place of the acoustic plasterboard so same question for that. Thanks in advance!

 

[Wayners]

Is the door liner the problem?
Just fit one the correct width.

You can get 6mm plasterboard if that helps

 

[mljbme]

I'd like to reuse the original Victorian door liner so this door is in keeping with all the others in the house. So it looks like it was originally there.

Are you suggesting overboarding the 12.5mm plasterboard with 6mm (laid perpendicular I assume) to pack it out? Is that a better approach than just packing out the studs with plywood?

 

[foxhole]

If you use ply it provides an easier fix for anything on the wall ( towel rad etc).

 

[Wayners]

All our walls where I am at the moment have ply over then plasterboard.
It's offices so great to hang stuff on walls.

Whatever works

 

[chirpychippy]

You could double board it, 9mm then 12.5 mm acoustic leaving 3.5mm for skim, it'll be cheaper and quicker than trying to pack each stud.

 

[chirpychippy]

All our walls where I am at the moment have ply over then plasterboard.
It's offices so great to hang stuff on walls.

Whatever works

I love a plyed wall beneath plasterboard, makes me life easy.