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Question: What is the advantage of the furring strip?

Craig writes from Canada: "I am replacing wood siding on my bungalow with vinyl. I have new windows with a vinyl open brickmold attached (to accept the vinyl siding). I have a jam depth on the window designed to allow for 1" of extruded polystyrene insulation on the outside wall. My proposed installation then would be (from inside out:

  • 1/2 inch drywall
  • 2x4 studs with batt insulation in between
  • 1/2 inch OSB exterior wall sheathing (all the above is existing)

    "I plan to add:

  • 1 inch extruded polystyrene 'codeboard'
  • housewrap
  • windows and vinyl siding

    "I see some mention of adding 1 inch wood furring strips over the codeboard before attaching the siding. If I do this, my siding will no longer align with the J-channel that is part of the window brickmold. It does not seem that building code in Canada requires the wood furring. My question is: what is the advantage of the furring strip and what do I give up by not having it in place? Are there any work-arounds you can think of?"

    Another good question, Craig. Furring strips are primarily used for leveling uneven surfaces or where there is not a nailable base such as a block or concrete wall. Vinyl siding can be applied over foam sheathing as long as the fastener penetrates a minimum of 3/4" into the framing. For more information on how to install vinyl siding, please visit the Vinyl Siding Institute's Website at www.vinylsiding.org. Thanks for asking. Pink Panther

    P.S. I tried to respond to you personally but my messages were returned as undeliverable.

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