I stand by my first answer- tapered strips of wood to go between the ends of
the plywood box and the back face of the molding. You could rip them real fast
with a table saw.
> THat's great to know, I will likely go with that. Thanks!
>
> As for the rest of the responses, clearly I did a horrible job of explaining
> the issue :-)
>
> Here's someone else's basement and what I'm trying to accomplish on a 100 year
> old house:
> http://s110.photobucket.com/albums/n115/rabbit_016/?action=view¤t=IMG_0
> 626.jpg
>
> In more detail, the basement wall is cinder block, and the windows are
> recessed against the outside. I framed the basement walls with sleepers,
> including framing around the window recesses. Then I built plywood boxes that
> slid into that window framing. Due to the wavy nature of the wall, the boxes
> would rarely sit flush against both the window and the wall framing. When I
> had to choose, I chose having them flush against the window.
>
> Then I sheetrocked the framing, and added 1x3 casing around the window
> openings. It's this casing that doesn't always meet the butt end of the
> plywood box. So the gap is between two wood surfaces, perpendicular to each
> other.
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