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Old 04-04-2011, 11:39 AM   #16
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NEWBIE QUESTION ALERT!! Jamb Extensions


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So you could actually build a box and insert to cover the entire inside (leaving no seam) OR run off of what you have and cut pieces to bring it out and offset:?
Yes you can as long as your 'full depth' jamb has something to butt up against once it gets out to the window frame.

Let's see you draw THAT...Willie

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Old 04-04-2011, 11:39 AM   #17
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NEWBIE QUESTION ALERT!! Jamb Extensions


TC, I believe I got it now?! THANK YOU Just gonna have to give it a try and see what happens?
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Old 04-04-2011, 11:41 AM   #18
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NEWBIE QUESTION ALERT!! Jamb Extensions


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Originally Posted by tcleve4911 View Post
Yes you can as long as your 'full depth' jamb has something to butt up against once it gets out to the window frame.

Let's see you draw THAT...Willie
LOL! But I do think it would help if you could Willie!?? IF you have time of course!
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Old 04-04-2011, 11:50 AM   #19
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NEWBIE QUESTION ALERT!! Jamb Extensions


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So you could actually build a box and insert to cover the entire inside (leaving no seam) OR run off of what you have and cut pieces to bring it out and offset:?
As long as use corkboard.
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Old 04-04-2011, 11:51 AM   #20
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NEWBIE QUESTION ALERT!! Jamb Extensions


Like this? I have installed a lot of replacement windows made similarly. The original frame was left in place due to perhaps being stuccoed in place... just the window parts were removed. The new windows went in over (inside) the old frame outline, and fastened to it.
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Old 04-04-2011, 12:26 PM   #21
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NEWBIE QUESTION ALERT!! Jamb Extensions


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Like this? I have installed a lot of replacement windows made similarly. The original frame was left in place due to perhaps being stuccoed in place... just the window parts were removed. The new windows went in over (inside) the old frame outline, and fastened to it.
YES!!! That is what I am talking about!


JUST ONE LAST QUESTION! (well as far as this goes anyway! ) How would I handle the window sill in THIS application? The window sill was left in place when they install the new replacement windows?! So it protrudes an inch or so past the drywall.

Gracias!
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Old 04-04-2011, 12:31 PM   #22
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Couldn't say. I've really never made a box like that. I like to build piece by piece in place.
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Old 04-04-2011, 12:36 PM   #23
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I don't think it really has to do with the box as much as I want to cover over it and possibly make it deeper? Guessing I would just cut it flush with the drywall?
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Old 04-04-2011, 02:46 PM   #24
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NEWBIE QUESTION ALERT!! Jamb Extensions


Are you talking about the interior sill trim, also called stool molding.


The stool is not part of the window frame, it is just another piece of trim cut to shape and nailed on. Interior trim is not usually removed when replacement windows are installed in existing frames, the stop molding is sometimes removed to get the old panes out, then re-installed to trim around the replacement window. With the casing and stop removed you should be able to pry the sill up and remove it.
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Old 04-12-2011, 06:30 PM   #25
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NEWBIE QUESTION ALERT!! Jamb Extensions


Just discovered this chatroom after 45ish years of DIY. Happy to be here.

Don't want to commit heresy but I want to attach PVC jamb extensions to new construction PVC windows (American Craftsman 3000 Series) and then apply PVC interior trim to the extensions. I've done a lot of work with exterior PVC trim but there's no need to attach the trim to the window unit - the windows already have brick mold fused to the window.

My primary question is - what's the best way to attach the inner edge of the PVC extension jamb to the PVC window? I know the 4 pieces of extension jamb need to be nailed to the wooden studs and/or attached to each other with screws to form an extension "box". But, isn't it necessary to somehow attach the inner edge of the extension jamb to the window?
Should I use PVC cement? Caulk? Nothing at all?
I noticed on these American Craftsman windows there is a groove around the entire inside perimeter of the window unit. Is this groove designed to receive some type of attachment to the PVC extension jamb? If so, it sure would solve the attachment and alignment challenge.

As far as the PVC trim is concerned - do folks use a PVC cement product or caulk to fuse the mitered trim pieces?

Thanks, in advance, for any advice.

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