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  1. #1
    Join Date
    Sep 2011

    Default Rotting exterior window trim


    We built our house 8 years ago. It's a basic Cape with 3 dormers. All of the exterior window trim on the 3 dormers is rotting. The rain appears to bounce off the roof and has penetrated the siding, causing decay, in record time.

    Any suggestions about the following:
    1) what material should I use to replace the trim. MDF? Plastic? It will need to hold paint and appear to be wood or the look of our cedar house will be for naught.

    2) what kind of preventive measures do you suggest behind and around the trim to keep water from penetrating underneath?

    Any advice will be appreciated!


  2. #2
    Join Date
    Aug 2007
    Portland, Oregon, formerly of Chicago

    Default Re: Rotting exterior window trim

    I would suggest that you get hold of a good carpenter. Eight year old window trim should not be massively failing. You need a carpenter to determine what was done wrong before you simply duplicate what was done before. He should check for proper weather screen, flashing and caulking.

  3. #3
    Join Date
    Dec 2011

    Default Re: Rotting exterior window trim

    Ideally, the siding should be painted on all sides, even the reverse.good luck!

  4. #4
    Join Date
    Jan 2010
    Northern Virginia

    Default Re: Rotting exterior window trim

    I have seen and repaired so much of this kind of water damage, and have concluded that it's caused by caulking placed where one should not caulk. Water needs a place to escape at the bottom; never caulk horizontal bottom joints in the casing.
    We have been replacing with spanish cedar and mahogany, fully backprimed and end-sealed.
    Remove not the ancient landmark, which your fathers have set.

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