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Thread: Exterior Window Trimming

  1. #1
    Join Date
    Jan 2006
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    Exterior Window Trimming

    I plan to trim the outside of my new windows with brick mold. I watched several videos and they all show applying it flush to the window frame and this is how my old 40 year old windows are. I just found in the fine print of the window directions that they say to leave a 1/4" gap all the way around for siding and 1/2" for brick (for expansion).


    So me trying to get ahead of things precut the molding for a pretty tight fit. Not the worse thing if I need to buy more brick mold but wondering is this 1/4" gap necessary?

    (I'm having the house re-sided next so maybe have the contractor provide the 1/4" clearance?)


    Thanks

  2. #2
    Join Date
    Feb 2014
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    Lake Gaston, Henrico, NC
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    I've never left that much, but I've only been doing that type of stuff for 48 years now, and never saw that much on 200 year old houses either. I can't imagine many places have more of a humidity swing than we have here. I've never used the plastic parts.
    Last edited by Tom M King; 05-26-2022 at 9:33 AM.

  3. #3
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    Mar 2003
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    SE PA - Central Bucks County
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    Room for seasonal expansion/contraction that is caulked is a good idea in general. Some modern siding products actually require it. (LP's products, for example)
    --

    The most expensive tool is the one you buy "cheaply" and often...

  4. #4
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    Thanks for the replies. I found out there is an Andersen dealer close by. I went there and they were very helpful. They said they don't leave much of a gap and the 1/4" is for siding to frame so when applying the siding will need gap/caulk. (I looked and I have a good 1/8" gap between the molding and window.)

  5. #5
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    Feb 2003
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    McKean, PA
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    14,241
    It would be helpful to know what type of siding is planned.

  6. #6
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    Quote Originally Posted by Lee Schierer View Post
    It would be helpful to know what type of siding is planned.
    LP SmartSide

  7. #7
    Join Date
    Mar 2003
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    SE PA - Central Bucks County
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    Quote Originally Posted by Mike Goetzke View Post
    LP SmartSide
    LP Smartside has very specific gap requirements that must be met to have the warranty. There are even tools to help insure those gaps are kept. One must also touch up the cut ends with their roll on paint, both on the siding products and the trim materials. It's work, but the end result can be really, really nice.
    --

    The most expensive tool is the one you buy "cheaply" and often...

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