Window Reveal not equal.

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11 Sep 2022
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Location
Havant
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United Kingdom
I live in an ex council home and as with most around here walls are out.

So, I have plasterboarded the window reveals and fitted the angle beads ready for plasterer to come in and skim the whole living room and ceiling, am now fitting the window board, which is 25mm bullnosed MDF, however the measurements of the window reveal are not equal one side the depth is 150mm and the other 135mm.

What is the best way to cut the back edge, so the front edge is aesthetically pleasing and equal on bothsides.

Do I just cut a 15mm wedge of the back? or is there more to it than that?

Thank you.
 
Cut to the wall at the front - the back edge by the window will need an angled edge on it
 
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