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Installation question for vertical metal siding (reverse standing seam) over Tyvek

psarchitecture | Posted in Green Building Techniques on

house under construction in coastal zone 3 (2-story 2×6 wood framed). Exterior walls are 1/2″ plywood
w/tyvek housewrap. Owner wants to install vertical metal siding (reverse standing seam “rustwall”) over tyvek house wrap and is concerned about the heat build-up melting the tyvek. I have been asked to advise whether to
1: take the tyvek off and start over with a better detail (I typically detail 1″ polyiso w/ a weather resistive barrier over that and then a vented air gap w/battens to hold off the siding
2. come up with another detail to keep the siding off the tyvek.

Up in the hills (bonny doon, CA) facing south and west about 10 miles from the ocean.

any thoughts would be greatly appreciated.

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  1. GBA Editor
    Martin Holladay | | #1

    The manufacturer of Tyvek informs builders that Tyvek can be installed under metal siding.

    Here is a link to the relevant web site: Tyvek FAQs.

    The web site notes:

    "Q. Can a Tyvek weather barrier be used under any primary façade?"

    "A. Yes, DuPont Tyvek WB can be used under any façade, including brick, stucco, vinyl, cedar siding, metal, and stone."

  2. psarchitecture | | #2

    Thanks Martin, I will check it out.

  3. Expert Member

    A "reversed standing seam" siding sounds like it might create its own rain screen cavity without needing battens.

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