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WFO built into retaining wall

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  • #16
    Re: WFO built into retaining wall

    Originally posted by david s View Post
    I agree entirely. I also use the same product to make my entire supporting slabs waterproof to prevent moisture wicking up from the stand. I think you have the spelling incorrect though it is "Xypex"
    Curious how the plans ignore this important simple step that can make a big difference , if this material was to used to waterproof the dome, where is it applied?
    Why is this thus? What is the reason for this thusness?
    I forgot who said that.

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    • #17
      Re: WFO built into retaining wall

      There are a lot of different additives you can use to make concrete waterproof. Xypex does other things too, like enhancing strength. I think it is a better plan to use a standard render for the outer shell, then after around 10 firings the water should be entirely purged and the dome can be waterproofed. If you make the outer shell waterproof when it is first applied you are locking on moisture and therefore risk cracking the outer shell from steam expansion.
      Kindled with zeal and fired with passion.

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      • #18
        Re: WFO built into retaining wall

        Originally posted by david s View Post
        ..... If you make the outer shell waterproof when it is first applied you are locking on moisture and therefore risk cracking the outer shell from steam expansion.
        Great advice! But, (if you do) add a vent to the apex of the dome through the final render .
        Joe Watson, "A year from now, you will have wished that you had started today"
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        • #19
          Re: WFO built into retaining wall

          I should fire her up then before i do any more waterproofing
          and hold back on backfilling to see if i get any cracks
          thanks for the advice

          Cheers

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          • #20
            Re: WFO built into retaining wall

            Originally posted by david s View Post
            I agree entirely. I also use the same product to make my entire supporting slabs waterproof to prevent moisture wicking up from the stand. I think you have the spelling incorrect though it is "Xypex"
            Yes, that's the stuff. I live in phonetic land. Anyway, to your other point - what holds water out also holds water in. So I don't think it would be good for a shell either. It's easier to use gravity to keep water off the dome. Just need a simple waterproof layer at the end. But for a hearth, it's great.

            My $.02 on the reason this isn't in the plans is because it's not needed if you build an oven according to the plans. It only becomes necessary when you deviate.
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