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pouring concrete on sm board(celfort 300)

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  • pouring concrete on sm board(celfort 300)

    I putting celfort 300 which is good for underslab and good for 30psi. I was installing it on the inside of the foundation walls today and put one on the ground and tried walking on it. seems to creek and crack.. I'm trying to figure out how people walk and wheel barel concrete on this stuff without breaking it. my gravel is not perfectly flat because it's 3/4 clear stone which can't be packed. don't know if this will be an issue?

  • #2
    Re: pouring concrete on sm board(celfort 300)

    I guess I would ask "Why are you putting it there?" What are you trying to accomplish?
    Jim

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    • #3
      Re: pouring concrete on sm board(celfort 300)

      The product is an insulation board,
      http://www.dispro.com/upload/D953.pdf

      can you put a thin layer of pea gravel or sand over the rock? to level it.

      I would think if your close on the rock the weight of the cement would make it conform to the lay of the rock.

      Another option if you want it perfectly level base (as show in the flyer posted above) do a very thin run of cement and screed it flat and sandwich it as it show in a few of the pictures.

      I personally would use the sand or fine gravel over the rock. and screed it out flat. Depending on how bad I thought it was.

      ~~~~~~~~~

      To do the wheel barrow put down some plywood or plank to run the wheel barrow on to spread out the weight. (and of course remove it as you go).
      Push sticks/blocks Save Fingers
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      • #4
        Re: pouring concrete on sm board(celfort 300)

        I wonder if I ran a plate packer over it if it would make it smooth enough? I know a friend that has one.

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        • #5
          Re: pouring concrete on sm board(celfort 300)

          I would tamp it. 3/4 stone will compact. I prefer A gravel for concrete base.

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          • #6
            Re: pouring concrete on sm board(celfort 300)

            {Quote}I am not a Masonry guy, but I have seen a lot of this. Prep work is the key to your slab. Damp compacting of your base material will help in the minimizing of cracks, reinforcing of the proper areas will also help. High density rigid foam boards 2" will be sufficient. There is a lot to know to get the job done right, my suggestion as others, find someone who is Licensed to perform this work. Unless you already have and your just trying to get smarter than them. It makes perfect sense to know whats going on, but it makes more sense to give it to the Pro's for a job done right. Yes this should be in the construction thread and not the plumbing.{Unquote}

            Does this look familiar, from your other thread????

            Of course you must know what your doing more than I, I'm just a General Contractor (Builder). Do as you want, I'm not the guy that has to fix your slab when it sinks and busts. Plumbdog10 also gave you good advice, good thing your still at the early phrase of the project. Everybody thinks Masonry is simple work, but you haven't a clue what to really do, thats why you asked and the right advice was given to you, but not the answer you wanted to hear.
            Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

            http://www.contractorspub.com

            A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

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            • #7
              Re: pouring concrete on sm board(celfort 300)

              my foundation guy is actually the one that metioned to use 3/4 clear stone because it does not need to be compacted. apparantly without granulars it cannot compact.

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              • #8
                Re: pouring concrete on sm board(celfort 300)

                I think I have this correct: 12 inches of 3/4inch stone will give 95% compaction untamped. That is the rule we use anyway.

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                • #9
                  Re: pouring concrete on sm board(celfort 300)

                  hmm.. I have a lot more than 12" on the inside sides of the foundation. although it's been a year since we put it in so it should have settled somewhat. there's probably a little over 48" around the inside perimiter and probably 12 in the center. so I should probably grade the gravel to account for my 2" slope toward the drain in the front allowing for 5" of concrete plus the 2" sm board. then run the plate packer around for a while? then put my 6 mil vapor barrior followed by the 2" sm then my wire mesh along with my kytec lines tied to it.

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                  • #10
                    Re: pouring concrete on sm board(celfort 300)

                    Dude,
                    You better get some help really fast before you spend any more money and expend any more energy on this project. Hire an engineer an architect or turn the entire project over to a general contractor who can assist you with design build projects. I have dug a number of cellars and worked with/for a number of different mason contractors. You say you have 48" of stone inside(?) the foundation next to the walls? You paid someone to excavate, form and pour footers, form and pour cellar walls then filled the inside with four feet of stone? That is just dumb and a waste of money. Unless you poured 14' walls the cellar ceiling will be so low the only persons who will be able to use the basement are double jointed, hunch-backed midgets.

                    There is an old Jewish saying: "Shoemaker mend your last." Well..."Computer store guy, sell your 'puters." In the long run you will save by hiring a professional.

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                    • #11
                      Re: pouring concrete on sm board(celfort 300)

                      ok apparantley someone doesn't understand here.. there's no f'ing basement. when you have a 30x40 garage at least around where I live with the frost and heaving.. you splurge and put footings at least 4 feet down with foundation walls and sit the garage on the foundation wall then pour a concrete floor.. no basement. this is a stand alone shop not attached to a house

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                      • #12
                        Re: pouring concrete on sm board(celfort 300)

                        Originally posted by jeffntanya View Post
                        ok apparantley someone doesn't understand here.. there's no f'ing basement. when you have a 30x40 garage at least around where I live with the frost and heaving.. you splurge and put footings at least 4 feet down with foundation walls and sit the garage on the foundation wall then pour a concrete floor.. no basement. this is a stand alone shop not attached to a house
                        Calm down, your question was answered, but the thing is, it wasn't the answer you are looking for. I would not have started the way you did, but this is your garage and you are doing it your way (wheres the building inspector at). I told you to compact it, but you said you do not have to. I would have added sand (wet it down after you place the sand) to help in the compacting and to get a decent base, but I don't think that you would. So do as you wish, and please respond back in here a year or 2 from now, w/pictures of your slab. It should be interesting to see if it stays in decent shape or not.
                        Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

                        http://www.contractorspub.com

                        A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

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                        • #13
                          Re: pouring concrete on sm board(celfort 300)

                          yes garager I'm goin to be packing it. just to make sure. eventhough I've been told by the inspector himself that it's not necessary to compact it. someone told me to do a test by filing a pail with 3/4 clear stone and then try to tamp it all you want and it won't change the level

                          also here's a picture of when I started building last year. note that now the siding is complete and the tin roof as well.



                          here's a side shot that shows the carport as well

                          Last edited by jeffntanya; 09-05-2007, 10:04 PM.

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                          • #14
                            Re: pouring concrete on sm board(celfort 300)

                            When I clicked on those pictures I got caught up in a Pornado

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                            • #15
                              Re: pouring concrete on sm board(celfort 300)

                              Originally posted by plumberscrack View Post
                              When I clicked on those pictures I got caught up in a Pornado
                              Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

                              http://www.contractorspub.com

                              A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

                              Comment

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