Expert: Dan Griffin - 3/11/2009

Question
I have two related questions. One involves extending window jambs and the other is how to trim off jambs that (unevenly) protrude beyond the drywall surface. I thought that simply nailing on extension pieces on the short jambs and then buying a power planer to remove the excess. This also would do for the uneven jambs. Your advice please??           Thank you,

Answer
Bill, I'm a bit lost on why the walls vary so much that you have uneven protrusion of jambs.  This is a job easiest with a table saw.  Rip appropriate extensions that fit.  Using a power plane in location will be problematic.  I would make every effort to have the pieces sized before installation. The plane of the inside of the window jambs need to be flat for the trim to lay up properly.

If this is drywall and wood windows, can you turn a piece of drywall back to the window?  This may be much easier as it won't require finish grade extensions and wall variations can be absorbed with corner beads.  Trim the side at the window with L or J trim, I would use bullnose corner beads.  Could look quite nice.