Window reveals out of square

[GaryMo]

I'm currently tiling my bathroom and will be at the point of tiling up to and into the window reveals using metallic trim.

The reveals are only around 50mm wide but the left and right hand reveals are parallel to each other but out of square with the bottom and top reveals - think parallelogram:

The sides run out by around 50mm from top to bottom.

What would you advise I do to get them a square as possible?

Currently, it's just 12.5mm plasterboard strips fixed to wood.

 

[tictic]

if you square it off by packing using p/boards will the window open?
if not, imo cut walls back and re-board to square.

 

[GaryMo]

if you square it off by packing using p/boards will the window open?
if not, imo cut walls back and re-board to square.

Yes, plenty of frame visible. I suppose I could cut another couple of strips of plasterboard (or some leftover 12mm hardibacker) and use plasterboard adhesive to bond them in position.

 

[tictic]

if you square it off by packing using p/boards will the window open?
if not, imo cut walls back and re-board to square.

Yes, plenty of frame visible. I suppose I could cut another couple of strips of plasterboard (or some leftover 12mm hardibacker) and use plasterboard adhesive to bond them in position.

dont use dri wall adhesive for the hardibacker,the gypsum in the dri wall addy wont bond to the cement based backerboard,it will for a while then de-bond because off the reaction between the 2 substrates.
if using the b/board use a flexible tile addy to bond to exsisting.

 

[GaryMo]

Cheers - good point.

 

[big-all]

how does the window sit in relation to the problem can you loose the discrepancy or will the window look odd against tiles because the margins dissapear!or extremly uneven !!

 

[GaryMo]

After a closer look, the window seems to sit with the reveals as they are currently. If I level them it may highlight a problem.
It's not a problem tiling to what's there but I may struggle with angles which aren't 45 degrees on the metallic tile trim.