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perlite -portland mixture for oven floor

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  • perlite -portland mixture for oven floor

    Hi all you pompeians,going to pour my insulation 5.5 perlcrete tomorrow and dont know if i have enough material--2 -90 lb bags of portland and 3 -4 cubic bags of perlite--think its enough? hope to finish the stand and shut down for the winter and continue the pompei dome in the spring. couldnt get this far if not for f/b .pretty good for an settegerian.hope I can get help on this.thanx

  • #2
    Re: perlite -portland mixture for oven floor

    How big is the area you are pouring?

    Width and length?
    My thread:
    http://www.fornobravo.com/forum/f8/d...ress-2476.html
    My costs:
    http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
    My pics:
    http://picasaweb.google.com/dawatsonator

    Comment


    • #3
      Re: perlite -portland mixture for oven floor

      The insulation layer is 72" by 84" ,just dont seem like portland and perlite will be enough volume to fill the 5" layer.what do you think guys,am i wrong?how much did you use?thanx

      Comment


      • #4
        Re: perlite -portland mixture for oven floor

        84"= 7 feet
        72"= 6 feet

        5"= .42 of a foot

        7'x6'x.42'= 17.64 cubic ft

        You have 12 cubic feet of perlite.
        For a 5 to 1 ratio of perlite to cement you will mix in about 2.4 cubic feet of cement.
        12+2.4=14.4 And usually the wet mix has a lower volume than the dry ingredients.

        I think you will need another bag of perlite. Or you might just go with a 4" insulating layer.
        4"= .34 of a foot
        7'x6'x.3= 14.28 cubic ft.

        Hope this helps some.
        My thread:
        http://www.fornobravo.com/forum/f8/d...ress-2476.html
        My costs:
        http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
        My pics:
        http://picasaweb.google.com/dawatsonator

        Comment


        • #5
          Re: perlite -portland mixture for oven floor

          hey thankx a lot --that gives me a good idea of how much i need..dont want to run short in the middle of a pour.Is there no sand added? seems like a weak mixture without samd.
          Last edited by MIKIPAL; 10-04-2007, 09:24 AM.

          Comment


          • #6
            Re: perlite -portland mixture for oven floor

            No problem.

            Better to have too much than too little.

            Plus any extra that's leftover can be used to insulate the dome later.

            Don't forget pictures!
            My thread:
            http://www.fornobravo.com/forum/f8/d...ress-2476.html
            My costs:
            http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
            My pics:
            http://picasaweb.google.com/dawatsonator

            Comment


            • #7
              Re: perlite -portland mixture for oven floor

              will load pictures as soon as i know how..computers are new to me and just getting to navagate is a problem---will try soon.ciao

              Comment


              • #8
                Re: perlite -portland mixture for oven floor

                Sand is not added to the perlite -portland mix?seems like a weak mix for support of the igloo .

                Comment


                • #9
                  Re: perlite -portland mixture for oven floor

                  No sand.

                  Just Portland cement, perlite, and water.

                  It gets pretty stiff!

                  1 part cement to 5 parts perlite by volume.

                  Mix the 2 together dry first. Get a good coat of cement on all the perlite.

                  It will look like clay cat liter.

                  Then add water. And just enough to hold it together.
                  I could just barely squeeze water out of mine with my hand, and it was probably a bit too wet.

                  I have a whole series of photos that include pouring the thermal layer on Picasa, in the album titled "Oven Mission 4 - The Insulating Layer", if you are interested in looking. They may be helpful.

                  Good Luck!
                  Attached Files
                  My thread:
                  http://www.fornobravo.com/forum/f8/d...ress-2476.html
                  My costs:
                  http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                  My pics:
                  http://picasaweb.google.com/dawatsonator

                  Comment


                  • #10
                    Re: perlite -portland mixture for oven floor

                    needed 3 more bags of perlit to finish stand.seems like 3 bags covered half of the stand---6 feetx7 feetx 4".mix 5 to 1 .but got it done and looks good--thanks for the pics -helped me a lot.great project .will continue in the spring for the igloo..the leaves are starting to fall here on long island and the colors are changing.good luck,ciao.mikipal
                    Last edited by MIKIPAL; 10-06-2007, 06:39 AM.

                    Comment


                    • #11
                      Re: perlite -portland mixture for oven floor

                      Miki,

                      There's no reason to stop now in your location. The only time you do is when freezing temps are forecast. In your neck of the woods, that's probably not until mid November. Fresh mortar cannot be allowed to freeze, and it takes 28 days to cure.

                      Jim
                      "Made are tools, and born are hands"--William Blake, 1757-1827

                      Comment


                      • #12
                        Re: perlite -portland mixture for oven floor

                        [QUOTE=MIKIPAL;16630will continue in the spring for the igloo..the leaves are starting to fall here on long island and the colors are changing.good luck,ciao.mikipal[/QUOTE]

                        I'm glad you got it done.

                        Too bad the weather is changing.
                        It's still in the 90's here.

                        It doesn't look like winter is coming here this year.
                        My thread:
                        http://www.fornobravo.com/forum/f8/d...ress-2476.html
                        My costs:
                        http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                        My pics:
                        http://picasaweb.google.com/dawatsonator

                        Comment


                        • #13
                          Re: perlite -portland mixture for oven floor

                          Hey Jim,

                          Did I do something wrong with my calculations?

                          He ended up needing 6 bags of perlite....

                          Just curious.
                          My thread:
                          http://www.fornobravo.com/forum/f8/d...ress-2476.html
                          My costs:
                          http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                          My pics:
                          http://picasaweb.google.com/dawatsonator

                          Comment


                          • #14
                            Re: perlite -portland mixture for oven floor

                            Originally posted by CanuckJim View Post
                            Miki,

                            There's no reason to stop now in your location. The only time you do is when freezing temps are forecast. In your neck of the woods, that's probably not until mid November. Fresh mortar cannot be allowed to freeze, and it takes 28 days to cure.

                            Jim
                            Jim, what about insulating blankets? The ones used to keep foundations warm after pouring during winters? Would that keep one working, or is it too risky?
                            An excellent pizza is shared with the ones you love!

                            Acoma's Tuscan:
                            http://www.fornobravo.com/forum/f8/a...scan-2862.html

                            Comment


                            • #15
                              Re: perlite -portland mixture for oven floor

                              Allow me to re-phrase the question. If fresh mortar is not allowed to freeze, and it takes 28 days to cure, how long after using the mortar can freezing temps be tolerable? Anyone?
                              An excellent pizza is shared with the ones you love!

                              Acoma's Tuscan:
                              http://www.fornobravo.com/forum/f8/a...scan-2862.html

                              Comment

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