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Some calculator question?

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  • Some calculator question?

    quick question - In the dome spreadsheet calculator it provides a recommended IT length. Do you adjust this length for the cardboard expansion joint around floor (ie add a 1/4") or just edge the dome back in?

  • #2
    If you are leavin a gap, then yes, you need to add that to the length. IT = radius of your dome. But FWIW, 1/4" seems like an awfully big gap. That's 1/2 an inch of expansion room.
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    • #3
      Got it. I think that's how thick the cardboard I have is. I'll see if I can find something thinner!

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      • #4
        At around 500 C the expansion of brick is around 0.5%. So say a dome of 1.0 m (1000 mm) then 0.5% is 5 mm (just under 1/4") So 1/4" all around is about right. There would be no point in not having enough space.
        Last edited by david s; 07-24-2017, 01:57 PM.
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        • #5
          Originally posted by david s View Post
          At around 500 C the expansion of brick is around 0.5%. So say a dome of 1.0 m (1000 mm) then 0.5% is 5 mm (just under 1/4") So 1/4" all around is about right. There would be no point in not having enough space.
          1/4 inch all around is 1/2 inch of expansion space - 1/4 on each side
          Last edited by deejayoh; 07-24-2017, 06:02 PM.
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          • #6
            Originally posted by deejayoh View Post

            1/4 inch all around is 1/2 inch of expansion space - 1/4 on each side
            Yes that's correct and if one is going to the trouble of including an expansion joint, that's why I said "no point in not having enough space" It needs more than is required to ensure it can do its job.
            Last edited by david s; 07-25-2017, 04:52 AM.
            Kindled with zeal and fired with passion.

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