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Is it necessary to use a rainscreen when installing fiber cement siding over Zip wall sheathing?

sheacon | Posted in General Questions on

I am trying to keep the budget down on the siding install on my own home

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  1. GBA Editor
    Martin Holladay | | #1

    As far as I know, neither the building code nor the manufacturer of Zip Sheathing requires a rainscreen gap between fiber-cement siding and Zip System sheathing.

    Unless you live in a very dry climate, however, I strongly recommend that you install your siding over a rainscreen gap. To learn more, see All About Rainscreens.

  2. nkurz | | #2

    The manufacturer says it's acceptable if you are using "Fiber Cement Vertical, Plank, or Lapped Siding":

    As to whether or not it's a good idea, I'll leave that to those more knowledgable.

  3. mackstann | | #3

    A rainscreen housewrap (like Tyvek Drainwrap) might be a good compromise. If you're already going to install housewrap anyway, it won't require any extra labor.

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