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Waterproofing Dome - Forno Bravo Forum: The Wood-Fired Oven Community

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Waterproofing Dome

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  • Waterproofing Dome

    Hey gang, i plan on covering the dome this weekend, basically wrapping the dome with 6" of CF blanket, then covering with stucco. So i need to waterproof the dome and came across this product Seal-Krete 5-Gal. Original Waterproofing Sealer-100005 at The Home Depot. I guess you just apply it to the finished surface to the stucco. What do you guys think about this.
    Matthew 19:26. With God all things are possible.

    My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

  • #2
    Re: Waterproofing Dome

    There is this elastomeric paint too BEHR Premium 1-Gal. Elastomeric Masonry, Stucco and Brick Paint-06801 at The Home Depot
    Matthew 19:26. With God all things are possible.

    My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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    • #3
      Re: Waterproofing Dome

      Shop UGL Gallon White Masonry Waterproofer at Lowes.com
      Matthew 19:26. With God all things are possible.

      My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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      • #4
        Re: Waterproofing Dome

        No one?

        Also do we use the stucco with fiberglass shards mixed in bags?
        Matthew 19:26. With God all things are possible.

        My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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        • #5
          Re: Waterproofing Dome

          Originally posted by V-wiz View Post
          No one?

          Also do we use the stucco with fiberglass shards mixed in bags?
          I think that the reinforced stucco would be a good idea. I'm strictly old school, and relied on my ages old memory of mesh wire. It is a pain in the ass to fit mesh to a dome. Though it can be done.

          I think it was David S. who reccomended the the fiber reinforced stucco. I'm not sure that shape is important to you, but unless you fit it very carefully, you will end up with extremely varying thicknesses for your blanket layer.

          I think that 3" is enough, but then I used vermicrete to true up the dome before applying stucco.

          Just Sayin'

          Edit,
          If you are intent on waterproofing, think about a vent of some kind at the apex of your finished dome.
          Last edited by Gulf; 05-01-2013, 05:20 PM.
          I don't care what folks say behind my back........They are either braggin' or.......lyin'

          joe watson

          My Build
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          • #6
            Re: Waterproofing Dome

            Originally posted by V-wiz View Post
            No one?

            Also do we use the stucco with fiberglass shards mixed in bags?
            Here is a video of someone using fiber glass reinforced stucco at about the 4:35 mark.

            Detailed How to Build an Authentic Pompeii Pizza Oven, Part 3 of 4 ~ Insulate & Stucco the DOME! - YouTube
            Link to my build here:
            http://www.fornobravo.com/forum/f6/3...lly-19181.html

            Check out my pictures here:

            Selected pictures of the build.

            https://picasaweb.google.com/1168565...g&noredirect=1





            sigpic “In theory, theory and practice are the same. In practice, they are not.” ― Albert Einstein

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            • #7
              Re: Waterproofing Dome

              Be careful, don't just use any old fibreglass, it needs to be AR (alkaline resistant) there are tons of different fibres available. I use plastic ones for the outer shell because it does not get too hot, but you can get steel in various sizes and thicknesses as well as stainless steel.go to a concrete supplies specialist.
              Kindled with zeal and fired with passion.

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              • #8
                Re: Waterproofing Dome

                Originally posted by Gulf View Post
                I think that the reinforced stucco would be a good idea. I'm strictly old school, and relied on my ages old memory of mesh wire. It is a pain in the ass to fit mesh to a dome. Though it can be done.

                I think it was David S. who reccomended the the fiber reinforced stucco. I'm not sure that shape is important to you, but unless you fit it very carefully, you will end up with extremely varying thicknesses for your blanket layer.

                I think that 3" is enough, but then I used vermicrete to true up the dome before applying stucco.

                Just Sayin'

                Edit,
                If you are intent on waterproofing, think about a vent of some kind at the apex of your finished dome.


                Thanks man. If im not mistaken ive used a premixed stucco with fiberglass before. Ill have to check and see about that. As far as wire mesh goes i have stucco mesh that is softer, its not as hard to work with, the wires are thinner so that shouldn't be too hard to work with.

                I was also thinking about mixing some Rapid Set with the stucco, so that it dries faster, it may even help out by not wetting the insulation too much, or even drying faster? just a guess.
                Matthew 19:26. With God all things are possible.

                My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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                • #9
                  Re: Waterproofing Dome

                  If the product you use contains Portland cement you can enhance its strength by keeping it moist for a week. I wrap mine in cling wrap for a week. If your product is acrylic then this curing does not apply.
                  Kindled with zeal and fired with passion.

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                  • #10
                    Re: Waterproofing Dome

                    Thanks David

                    I dont think ill add waterproof additives with the stucco so i will allow the stucco to dry fully then apply the elastomeric water proofin paint at the end.
                    Matthew 19:26. With God all things are possible.

                    My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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                    • #11
                      Re: Waterproofing Dome

                      Yes that's exactly what I do too.
                      Kindled with zeal and fired with passion.

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                      • #12
                        Re: Waterproofing Dome

                        This and another post talk about stuff to seal and exposed dome but does anyone experience problems with the render/stucco cracking?

                        Where I'm going with this one is.......people talk about a vent for moisture at the top, which makes sense for moisture but does one need to allow an expansion joint?

                        So this would be where you have fire blanket then render/stucco and whatever waterproofing thing.
                        Cheers
                        Damon

                        Build #1

                        Build #2 (Current)

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                        • #13
                          Re: Waterproofing Dome

                          Your blanket and or vermicrete act as an expansion joint.
                          Kindled with zeal and fired with passion.

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                          • #14
                            Re: Waterproofing Dome

                            What David said, also if waterproofing is being added later i dont think a vent is needed as stucco itself does breath. So if elastomeric is being applied later down the line a vent wont be needed
                            Matthew 19:26. With God all things are possible.

                            My Build: http://www.fornobravo.com/forum/f21/...les-18741.html

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                            • #15
                              Re: Waterproofing Dome

                              Originally posted by V-wiz View Post
                              What David said, also if waterproofing is being added later i dont think a vent is needed as stucco itself does breath. So if elastomeric is being applied later down the line a vent wont be needed
                              I don't really agree with you because one of the problems with creating a waterproof skin is that it is not permeable. Acrylic coatings do not breathe like a lime coating can and they run into problems if there is significant moisture behind them just like acrylic paint on a wall ie. blistering. That is why it is essential to dry the oven out thoroughly before applying it (say 10 decent cooking fires). Any subsequent moisture build up can then be dealt with by a vent.
                              Kindled with zeal and fired with passion.

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