Quote:
Originally Posted by bareftrz  Should I try to sand a bevel on edge of the sheetrock with a belt sander along the sill and headers to make them have the same gap as the sides? That seems to be the only way that I can use the same thickness extension jamb all the way around the window so that the casing will lay flat on the wall surface. |
Not sure if you missed this part or what: Put on an additional extension jamb that is a consistent thickness.
If needed you can mud around the window where the new jamb extension is sticking out past the wall so as to level the wall surface out with the extension jamb. Once you do that, the wall will be perfectly flush