What Kind Of Material Do People Use For Extension Jambs? - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 03-08-2011, 08:19 AM   #1
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What kind of material do people use for extension jambs?

I have vinyl windows, and am going to be puting on white casing, but I can't seem to figure out what people use to make white extension jambs. Also the distance from the window to the inside of the drywall in some areas fluctuates as much as 3/4" when I measure around some windows, is this going to cause problems with installing extension jambs and casing?


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Old 03-08-2011, 09:25 AM   #2
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The big box stores carry a line of pvc mouldings in the millwork aisle (but not all in one place.
Other than that, use pine or poplar and paint it


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Old 03-08-2011, 11:47 AM   #3
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If the windows and walls are cocked--you will need to taper the jamb extenders..
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Old 03-08-2011, 06:03 PM   #4
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3/4" variance. Are you sure it's that much?

Generally you can average the error when sizing the extensions, then sand or grind the high drywall after the extensions are installed, then the casings will make everything look right again.
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Old 03-09-2011, 07:33 AM   #5
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I usually cut the taper close ,then hand plane the wood to match wall. As bud said sand drywall if needed.
Popular is a middle of the road wood which I favor if it is going to be painted.
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Old 03-09-2011, 11:02 AM   #6
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I used 3/4" subfloor plywood.

I cut it to width, sand it, fill it, sand again, nail and glue together, install the unit, shim and nail. Caulk and paint. By the time it's done you can't tell it's plywood unless you study it.

If your framing is really as much as 3/4" off you really should have either furred it out or something prior to putting up the drywall.

The windows are (hopefully!) flat, so the part that's out is the face of the wall. You can do a few things and kind of spread the "error" around. You can remove some of the drywall that will be covered with the casing. You can bend the casing a little (keeping it flat on the jamb portion). You can taper the jambs. You can caulk the area between the casing and the wall.

Using wide molding helps -- gives you more room to ease the transitions.


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