Enlarging a window's rough opening
#1
Enlarging a window's rough opening
I'm planning to replace an existing basement window with glass block. The problem I'm facing right now is - the existing opening for the window is about 1/4" too narrow and 1/2" too short for the total width and height of the completed frame. This is a basement window, set into the foundation.
How can I best accomplish this very slight but absolutely necessary enlargement?
I have considered using a router or skill saw to notch out the proper depth of the existing boards in channels and then break out the rest. I've also considered renting a power sander to do the same more evenly (and slowly I'm sure), pulling the framing, running it through a planer and replacing, using NEW wood and planing it to fit, and several other ideas some saner and some crazier.
I really don't know the best way to approach this. Help?
How can I best accomplish this very slight but absolutely necessary enlargement?
I have considered using a router or skill saw to notch out the proper depth of the existing boards in channels and then break out the rest. I've also considered renting a power sander to do the same more evenly (and slowly I'm sure), pulling the framing, running it through a planer and replacing, using NEW wood and planing it to fit, and several other ideas some saner and some crazier.
I really don't know the best way to approach this. Help?

#5
Without building up multiple pieces of wood (a thought that just occurred to me), planing or cutting out is the only answer available.
#6
Unless I am not picturing something right... remove all the wood from the masonry opening... make a jamb out of 3/4" thick Azek that will be exactly the right size to fit your glass block, and then place that jamb in the rough masonry opening, level it, square it, shim it, and anchor it. Then install your glass block inside it.
I've seen a reputable masonry company use this technique, they had me build and install the Azek frames for them.
The gap around this frame is covered with interior and exterior trim that is ripped down to size. (more Azek).
I've seen a reputable masonry company use this technique, they had me build and install the Azek frames for them.
The gap around this frame is covered with interior and exterior trim that is ripped down to size. (more Azek).
#7
Azek wouldn't have been quite thick enough, I checked. Too bad they don't make Azek in more sizes - would have been a perfect material...
As it turned out I got some new 5/8x6" and used the table saw to plane off 1/8 inch of one of the boards.
Finished product:


Full album of today's work
https://picasaweb.google.com/1069450...wAugust252011#
As it turned out I got some new 5/8x6" and used the table saw to plane off 1/8 inch of one of the boards.
Finished product:
Full album of today's work
https://picasaweb.google.com/1069450...wAugust252011#
#8
Azek also comes in 4x8 sheets that are 1/2" thick. You are right that it would have been the best material to use.