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Stucco on Hardiboard - Forno Bravo Forum: The Wood-Fired Oven Community

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Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

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Stucco on Hardiboard

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  • Stucco on Hardiboard

    I searched the forum for guidance on this but couldn't find a good thread, so thought I would put it up for the group

    I want to do a stucco finish on my oven housing, which made of metal stud/hardiboard. I need some input on the correct approach here.

    Some places I read that the right way to do this is
    • Tarpaper
    • Metal lath
    • Stucco (scratch/brown/final coats)

    Other places I have read that it's ok to apply the stucco straight to the hardiboard.

    Then there is also synthetic stucco, which I guess is an option

    What's the right way to do this?

    thanks
    Dennis
    My build progress
    My WFO Journal on Facebook
    My dome spreadsheet calculator

  • #2
    Re: Stucco on Hardiboard

    Dennis,
    I looked at this stuff by quikrete at my local Home Depot today. Scroll down to Quikwall. They had a broken bag and as it is my nature to investigate. It appears to be made of white portland has fibres in it. I have never worked with it. Just thought I would throw that out there .
    I am more familur with latheing.
    Last edited by Gulf; 10-01-2012, 04:04 PM.
    I don't care what folks say behind my back........They are either braggin' or.......lyin'

    joe watson

    My Build
    My Picasa Web Album

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    • #3
      Re: Stucco on Hardiboard

      Unless you can live with cracking at the joints and corners, you have to lathe it. Quickwall is a product used for drystacked block walls, it is just good stucco with fibers. Synthetic is an option, but will still crack at the joints and corners.

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      • #4
        Re: Stucco on Hardiboard

        Originally posted by Tscarborough View Post
        Unless you can live with cracking at the joints and corners, you have to lathe it.
        I'd second this. I used metal lathe over everything, including block. It came out great and hasn't cracked at all. The block probably wasn't necessary and required a hammer drill, but it made the transitions easier.

        I used Tscarborough's mix posted here a while back. Thanks, BTW! Worked great (but I'm glad that job's done!),

        For Base:
        1 part Portland
        1/2 part type S Lime
        3 parts sand

        For Finish:
        1 Portland
        1 S Lime
        2-4 Sand
        Attached Files

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        • #5
          Re: Stucco on Hardiboard

          Tscar and Pdiff

          Thanks for the responses! That's what I was looking for.

          Pdiff - great spot for that oven! That is beautiful. And the stucco look you have is just what I want for my oven house
          My build progress
          My WFO Journal on Facebook
          My dome spreadsheet calculator

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          • #6
            Re: Stucco on Hardiboard

            gut feeling is that you need the metal lathe to give the stucco some back-bone. Otherwise I can see it peeling off the cement board in chuncks....

            however I have no experience.

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            • #7
              Re: Stucco on Hardiboard

              Originally posted by deejayoh View Post
              Tscar and Pdiff

              Thanks for the responses! That's what I was looking for.

              Pdiff - great spot for that oven! That is beautiful. And the stucco look you have is just what I want for my oven house
              Thanks. I picked up a rounded cornering tool for the edges and flat trowel for the rest. I also did not tint the stucco, but painted at the end. Too many small batches (innumerable 5 gal bucket mixes) to keep a tint consistent.

              Yes, the placement is nice, in the country side, but I haven't been able to fire for many weeks. That grass you see is now tinder dry (no rain for 2 1/2 months) and I'm scared of starting a fire I have several placements of screening on the chimney, but sparks can still fly out. Not worth the chance. Hope it rains or at least gets a heavy dew soon!

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              • #8
                Re: Stucco on Hardiboard

                I applied stucco directly over Duroc backer., same as applying over scratch coat. You can tape the seams with fiberglass tape like drywall finishing and nothing will crack. Prepare similar to prepping for tile. I have some areas that are several years old, even some with cultured stone applied to it, again mine is Duroc brand not hardi backer.

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                • #9
                  Re: Stucco on Hardiboard

                  Ironpony, there are 2 types of advice given on the internet:

                  Anecdotal

                  and

                  Best practice

                  Anecdotally, I am sure your experience is valid. As a professional in the industry, I can not give other than Best Practice advice. There are many ways to do any particular project, and sometimes or even often the anecdotal advice will work. The issue is when it doesn't. That is why the acceptable industry practice is to apply lath over cement board or hardibacker when when coating with stucco or faux stone on broken planes.

                  The choice is up to the individual, but unless best practices are followed, there will be no warranty (not that they warrant cracking anyway). Normally the investment in time and money to do it to specification is well spent when the alternative to remove and redo will be several times the initial cost of doing the project to Best Practice.

                  It all boils down to your willingness to assume that risk.
                  Last edited by Tscarborough; 10-02-2012, 06:59 PM.

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                  • #10
                    Re: Stucco on Hardiboard

                    Tscar -
                    What about the moisture barrier (e.g. felt paper). Is that not necessary?
                    My build progress
                    My WFO Journal on Facebook
                    My dome spreadsheet calculator

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                    • #11
                      Re: Stucco on Hardiboard

                      It is cheap and it is effective, so required or not it is Best Practice.

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                      • #12
                        Re: Stucco on Hardiboard

                        answered his question. just another forum with to many experts. I will never post again.
                        over and out.

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                        • #13
                          Re: Stucco on Hardiboard

                          No need to get mad.

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                          • #14
                            Re: Stucco on Hardiboard

                            I don't get the thin-skinned thing.

                            Bill

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                            • #15
                              Re: Stucco on Hardiboard

                              I applied stucco (3-coat) to my oven directly to the cement board. I used woven fiberglass mesh in the brown coat. I used a concrete bonding adhesive on the cement board prior to the scratch coat. Same process used on my CMU walls for the base and island areas. Not a crack to speak of, hairline or otherwise.

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