I am remodeling my kitchen and I have removed all the old plaster walls and will be covering them with 1/2" drywall. The old plaster was about 3/4" thick so the window jambs will be sticking out past the drywall. I have already bought all the drywall needed for the project. Is there an easy way to correct the jamb depth or do I need to buy thicker drywall?
If it is a fairly small wall I would just add a peice of 1/4" plywood to all of the studs to fir it out the 1/4" difference. You could also plane down the jamb around the window but one error and you could cause alot of damage.
Go down to your local lumber suppply store and purchase 1/4" thick x about 3/4" wide - strips of wood (usually made from douglas fir)
Install your sheetrock, then when installing your window casing:
Nail the insides (of the casing) to your window jams and 'float' the outside areas. Install the casing all around, without nailing the outside edges..only the insides.
Once you have all your casing installed, measure the length of each side.....then, measure and cut the same length of 1/4" strips.
Slide your 1/4" Strips under the new window casing's outside edges, being careful to align them flush to the sides of the casing. Do the sides first and the top last.
(In effect, you are installing "casing thickness extensions")
Then, nail through (the casing and the strips). This will work the best if you are nailing with a 'gun', rather than hand nailing...to help avoid the strip from 'shifting' or 'moving'...during installation.
This works well, whether you are staining or painting the trim work.