I am fitting window trim to windows that have been installed in block walls. The walls have furring strips and the dry wall is attached to these.
The first problem is getting the extension jambs to fit neatly against the windows and remain flush with the wall. The second problem is attaching the trim to the wall.
I want to use cabinet head trim.
Any suggestions?
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Well, it's probably too late now, but when I renovated my downstairs, I attached 1x4 strips all around the windows. That made good furring strips for the sheet rock and also gave me something to nail the trim into. Then I forgot to do the same thing at the bottom of the wall and had to do all sorts of things to get the baseboard attached.
I also found some hardened nails that resemble small box nails at True Value hardware. If you intend to paint those jambs, those nails might do the trick for you.
The first problem is getting the extension jambs to fit neatly against the windows and remain flush with the wall.
Are the windows out of plane with the walls? If so, you might have to cut tapers on the extensions. If you're just having problems getting the extensions to stay in tight, maybe you could drill pilot holes through them and run screws into the window frame.
The second problem is attaching the trim to the wall.
I don't think I'm following you here. You mentioned that there are furring strips for the sheetrock. Can't you nail (or run screws) into those same furring strips?