+ Reply to Thread
Results 1 to 5 of 5
  1. #1
    Join Date
    Jun 2012
    Posts
    2

    Default exterior trim painting

    I need to replace two pieces of exterior trim on a shed. Should the trim be primed and painted on all four sides or just the exposed sides. Years ago I was told to just paint the exposed sides so the wood could "breathe". Thanks for any help.

  2. #2
    Join Date
    Aug 2007
    Posts
    6,963

    Default Re: exterior trim painting

    You do not need to prime/paint all sides, but you do want to make sure you prime/paint any exposed surfaces, which includes the bottom end closest to the ground.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Aug 2007
    Location
    Portland, Oregon, formerly of Chicago
    Posts
    1,757

    Default Re: exterior trim painting

    Traditionally, siding on a home would be back primed to protect against moisture generated in the house from working its way from the interior to the exterior. Moisture entering the wood siding can cause peeling when the heat of the sun beats on the siding come spring. Moisture condensing on the rear of the siding can also cause tannen leaching from cedar,redwood siding or even fir siding. This causes yellow/reddish streaks to appear on the front side of clapboards.

    However, a shed does not generate moisture in the same fashion as a house. No one is showering, cooking or doing laundry in that shed, so the same need to backprime does not exist. If however, the boards are very dry (under 8% moisture), priming all sides would not hurt. It is always a good idea to seal end grain.

  4. #4
    Join Date
    Jun 2012
    Posts
    2

    Default Re: exterior trim painting

    Thank you so much for your replies. It's my sister's shed and she would be more comfortable if I primed and painted all sides, which I will do.
    Thanks again.

  5. #5
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,376

    Default Re: exterior trim painting

    There's nothing to add to the former execellent answers, except: make sure that no rain or other water gets into the unprimed portion of the trim. Caulk the top and sides of the trim to make a good seal.

Posting Permissions

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