+ Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Join Date
    May 2008
    Posts
    4

    Default Fixing Window Jamb Extensions

    I just built a new home and am down to installing window casings. I have about 28 Anderson windows with factory installed jamb extensions. The extensions protrude beyond the drywall by as much as 1/4" at the top and taper down to 0" at the bottom. The taper is due to the use of window wraps on the exterior that are overlaid at the bottom thus making the wall thicker. I am having trouble installing the interior casings because of this taper and the jamb sticking out beyond the drywall. It is my understanding that ideally you want 1/16" to 1/8" of jamb beyond the drywall all around the window. I cannot remove the jamb extensions. How can I fix this problem in place? Thanks - Jason

  2. #2
    Join Date
    May 2008
    Location
    Denver and Dublin
    Posts
    63

    Default Re: Fixing Window Jamb Extensions

    Andersen Extension Jambs are a Tongue and Groove wrap which is why we don't normally have them factory installed, the whole point is the extensions are adjustable. If they are not factory installed, we normally adjust them during installation to compensate for inconsistency. Your supplier probably didn't say, but Andersen gives you the choice and, regardless, they're very easy to remove or adjust.

    This is a little difficult to explain without a picture but. Put a 3/4" straight cut bit on your router and set it flush with your router base plate and then set that flat on your window wall. The problem is, turn the router on and it cuts nothing. Now, raise up one side of your router plate by attaching a 1/2" piece of anything to one side of the bit and lower your router bit flush with that. Now, if you turn the router on, anything not flush with that 1/2" piece gets cut away. That's how we cut away extending window jambs or anything else.

    I hope that makes sense.
    Last edited by KKelly; 11-07-2008 at 11:35 PM. Reason: clarity
    If I only knew what I was doing!

  3. #3
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,793

    Default Re: Fixing Window Jamb Extensions

    Although the router is fast it is possible that you will do some serious damage also. For no more than what you need to remove, I would use a hand plane and plane the extension down to the proper level.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  4. #4
    Join Date
    May 2008
    Location
    Denver and Dublin
    Posts
    63

    Default Re: Fixing Window Jamb Extensions

    I would like to use a hand plane too Jack but Andersen Jamb Extensions, as most factory applied jamb extensions, are stapled together. A hand planer could, unless under the best hand, pull them apart and make things worse. In my opinion, a router requires less skill than a hand planer.
    Last edited by KKelly; 11-08-2008 at 09:58 AM.
    If I only knew what I was doing!

  5. #5
    Join Date
    May 2008
    Posts
    4

    Default Re: Fixing Window Jamb Extensions

    Thanks. I think I understand but just one question. Does the 1/2" piece then ride on the drywall? I agree this sounds pretty good, but I can also see where just one wiggle of the router could gouge into the jamb.

    Quote Originally Posted by KKelly View Post
    Andersen Extension Jambs are a Tongue and Groove wrap which is why we don't normally have them factory installed, the whole point is the extensions are adjustable. If they are not factory installed, we normally adjust them during installation to compensate for inconsistency. Your supplier probably didn't say, but Andersen gives you the choice and, regardless, they're very easy to remove or adjust.

    This is a little difficult to explain without a picture but. Put a 3/4" straight cut bit on your router and set it flush with your router base plate and then set that flat on your window wall. The problem is, turn the router on and it cuts nothing. Now, raise up one side of your router plate by attaching a 1/2" piece of anything to one side of the bit and lower your router bit flush with that. Now, if you turn the router on, anything not flush with that 1/2" piece gets cut away. That's how we cut away extending window jambs or anything else.

    I hope that makes sense.

  6. #6
    Join Date
    Dec 2007
    Location
    MN
    Posts
    455

    Default Re: Fixing Window Jamb Extensions

    How about using a belt sander?

  7. #7
    Join Date
    Dec 2007
    Location
    MN
    Posts
    455

    Default Re: Fixing Window Jamb Extensions

    Yes sir,like using the router using caution. The sander might be a little easier to balance than the router.

  8. #8
    Join Date
    Feb 2008
    Posts
    45

    Default Re: Fixing Window Jamb Extensions

    i'd love some clarification on this thread, as i'm confused about one part. i'm a bit of a noob, so bear with me

    if the jam extensions stick out past the drywall in a 'tapered' way (ie. lets say 3/8" at the top, and 0" at the bottom), then won't planing them flush to the drywall cause the reveal of the extensions to look bad when finished? ie. it won't be even, and will also taper - and might be quite noticeable.

    would a better option to be build up the wall with mud to bring the un-planed jams flush, feathering it out a long way to ensure it isn't visible to the eye.

  9. #9
    Join Date
    Jul 2009
    Posts
    3

    Default Re: Fixing Window Jamb Extensions

    I have a similar problem - we removed paneling in our living room as part of our updating - it seems previous owners planned the windows around this paneling. We're ready to trim but realized the window casings extend out at least 1/4" past the drywall. How do we trim the windows and make it look flush?

  10. #10
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,793

    Default Re: Fixing Window Jamb Extensions

    Quote Originally Posted by llobeck View Post
    I have a similar problem - we removed paneling in our living room as part of our updating - it seems previous owners planned the windows around this paneling. We're ready to trim but realized the window casings extend out at least 1/4" past the drywall. How do we trim the windows and make it look flush?
    1] you can rabbit out the trim
    2]you can use a belt sander to sand the jambs down
    3] you can use a router and sled to cut the jambs down
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •