creating a jamb extension

[econguy]

Hi

I'm beginning to install interior window trim, and I've noticed that the drywall I used (5/8" thick) is slightly higher than the window jamb, so the casing doesn't lie flat.

I don't want to fill this gap with caulking...do I use a jamb extension instead to raise the jamb flush with the drywall? If so, how do I make one? The gap between is only about 1/8" - 1/4". Do I just use a table saw to rip a strip of wood this thin, and then glue it on?

Thanks for any advice

[Roy J.]

Hammer down the sheetrock close to the jam to remove the crack and let the trim float itself out.

[Dragon]

I tend to take a piece of casing and hold it flush with the inside of the jamb, then pencil a line on the outside. I then cut the sheetrock about 1/4 inch inside the line created and remove it. Using 1/4 inch reveal on the jamb when the casing is installed will leave about 1/2 inch of sheetrock for the casing to rest on.

Yes, you'll have to bevel your miter cuts to get a good fit, but it is seldom over 2 degrees and you really should be beveling to fit anyway.

[Don_P]

Depending on the casing, I use the power planer on the backside to remove what's needed. Sometimes it takes all those tricks and a bit of french for good measure.