Warped composite/marble window sills?

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  #1  
Old 10-25-16, 07:16 AM
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Warped composite/marble window sills?

Hi all, I have vinyl replacement windows in my home, they are at least 16 years old. I have been noticing the marble, or composite marble, sills are warped up in the center. What would cause that, and can they be saved if new replacement windows are installed? If I can't get help here, does anyone know where I can ask? Thanks.
 
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Old 10-25-16, 08:12 AM
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Can you post a couple pictures?
 
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Old 10-25-16, 08:44 AM
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Are these the interior thin marble stools? and not the thick exterior ones?
http://www.doityourself.com/forum/el...-pictures.html
 
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Old 10-25-16, 09:49 AM
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They are the thin interior sills. It's a bit hard to see in the photos, but I tried. Thank you for any advice.

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This is what you see standing in front. The blind, as you can see, is farther away from the ends than the center of the sill.

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This is under the sill. There is no gap under the ends of the sill, but a bit of a gap under the center of the sill

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Pic of topside of sill
 
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Last edited by ginakra; 10-25-16 at 10:06 AM.
  #5  
Old 10-25-16, 10:10 AM
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They probably didnt use enough glue. Or cold air coming under the window has created enough condensation underneath the trim that it has bowed up whatever the sill was glued to.
 
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Old 10-25-16, 11:18 AM
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So do you think the sill(s) will be ok and straighten out, or is it bowed for good? Thanks.
 
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Old 10-25-16, 02:53 PM
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Bowed for good unless you take them off and fix them.
 
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Old 10-25-16, 03:54 PM
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How can I fix them? Or did you mean replace?
Thank you.
 
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Old 10-25-16, 04:12 PM
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Well let's see. When you take them off, they might just stay in that bowed shape for all I know. You won't know until you remove them.

You also won't know how straight the window framing is until you remove them.

If you remove them and the window framing is bowed, you would probably need to straighten the window framing. The sill is just going to follow the shape of whatever it is sitting on. So if you have a level, draw a straight line across the drywall and I the drywall isn't straight, cut it straight. Then if the framing is bowed, chisel it down until it is straight too.

Alternatively, you could shim both ends up however much you need to in order for the sill to be straight and level, but it will mean fixing the gap under the sill with some joint compound and or caulk.
 
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Old 10-26-16, 01:01 PM
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Ok, that helps a lot. Thank you for your advice XSleeper I might come back when/if this project starts. Thanks again.
 
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