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Looking for a 1h+ fire rated wall covering material, moisture proof like cement board

Don J. | Posted in Green Products and Materials on

Dear experts & vendors

I am looking for a ceiling/wall material to safely cover XPS in a ‘wet area’ such as a bathroom.
Is there a material with the properties of type X or C drywall having the durability of cement board combined?

In particular I need fire rating 1h+ and moisture / mold resistance as with cement boards.

Can you recommend various materials I can use to cover XPS with above characteristics so I can install it in a ‘wet’ area indoors as wall panel or ceiling panel?

Thank you

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Replies

  1. GBA Editor
    Martin Holladay | | #1

    Don J.,
    Cement backerboard can be used in 1-hour fire-rated assemblies. Here are some links to documents that provide examples:

    Page 5 of this document:
    http://www.usg.com/rc/system-catalogs/durock-cement-board-system-guide-en-SA932.pdf

    Page 48 of this document:
    http://www.ronblank.com/courses/ngc09c/ngc09c.pdf

    Page 8 of this document:
    http://www.nationalgypsum.com/resources/construction-guide/NGCPermaBase.pdf

    Page 9 of this document:
    http://www.jameshardie.com/homeowner/pdf/backer-install-us.pdf

    There are four images attached below. Unfortunately, the GBA software runs all the images together. If you click carefully, however, you can separate and enlarge the four images I have posted.
    .

  2. Don J. | | #2

    Thanks Martin

    I have seen these before but I thought it's actually the gypsum panel adding the fire protection.
    On Hardie's website they say the temp is passed through cement and can't protect the substrate from rising temps.
    see http://www.jameshardie.com/dealer/fire_faq.shtml
    Type X & C drywall also won't collapse as fast as cement board when exposed to direct flame.
    I guess that has to do with the fine fiberglass fibers in the cement board. I bet it would have been fine if metal lath had been used

    Are there any other panels that come to mind?

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