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How to add stone veneer with exterior insulation

Townsendbuild | Posted in General Questions on

Building a 8×16 office shed.  I was able to get stone veneer for cheaper than siding.  I am planning on doing zip, rain screen, then 2 ” rigid foam.  I am doing LP smart siding on 3 sides and the veneer on the front.  What is the process of attaching that?

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Replies

  1. jollygreenshortguy | | #1

    Is your stone veneer thin, like tile? Or is it thick, let's say 1" or more?
    The process is very different. Thin stone veneer can be applied rather like a 7/8" 3 coat stucco assembly, with the stone replacing the outer 2 layers of stucco. The lath, properly attached through the insulation into the wall framing, can support the stone load.
    But if you go with a thicker veneer, then you need support (and drainage) at the bottom of the stone wall.

    1. Townsendbuild | | #2

      It is a thick. Faux rock.

  2. jollygreenshortguy | | #3

    It looks like "thin stone veneer". The code basis is some certain weight per square foot for the finished assembly. If memory serves it's 25 psf. But I'm not 100% sure about that. Anyhow, going on that assumption I'm going to point you to a really good source that will cover every question that might come up. Eldorado Stone is one of the best manufacturers and they have loads of resources on their website.

    https://www.eldoradostone.com/resources/installation-and-maintenance/

    The first document on that page CMHA Installation Guide, is the one you want. Browse through it all. But as a short cut, study the details on pages 20 and after, and check the related table 4 for fastening requirements.

  3. prairieburner | | #4

    I installed Eldorado stone on the front of our house that has exterior foam. Looks great and has been performing excellently.

    The buildup was: studs, 3/4 plywood, housewrap, 1. 5" poly iso, 1/2 plywood (long screws), tar paper, metal lath, mortar scratch coat, stone.

    1. Malcolm_Taylor | | #5

      prairieburner,

      The stack-up on this house was:
      - Plywood sheathing
      - House-wrap
      - Rain-screen strapping
      - Hardi-backer cement board
      - Lath
      - Mortar and rock
      Adding a layer of foam outside the WRB shouldn't change much.

      1. prairieburner | | #6

        Very true, just longer screws to attach the Hardi-backer, lol. Looks good!

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