Gravity: Laying Two Vertical Levels Of Concrete Simultaneously - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 11-14-2007, 09:02 AM   #1
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gravity: laying two vertical levels of concrete simultaneously

if i am laying two levels of concrete simultaneously, like i am making steps, is there a specific technique to prevent draining the top level through spilling over the lower level, amid liquid dynamics ?

my cocnrete experience thus far has been limited to single plane forms.

simply, when i try to explain it to myself theoretically, i see the top level sinking down and spilling through the bottom amid gravity.


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Old 11-14-2007, 09:15 AM   #2
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Proper concrete mix is not that free-flowing. Which is why you need to vibrate and/or agitate it during pours in order for it to completely fill the forms. You could attach cover over bottom step to prevent push-up when you pack in the upper section, but soon as you are done, you should be able to open it up in order to trowel the bottom step smooth.


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Old 11-14-2007, 09:20 AM   #3
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thanks !

that makes sense.
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Old 11-15-2007, 11:31 AM   #4
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They put in step footings like this all the time. You might not even have to "lid" off the top of the lower steps or maybe just the first few inches. I just poured a step footing with 16 " steps (total 4'8" height change over 12 feet) without any "lids".

I did have a 2x4 brace across the bottom of the plywood end panels of the steps that might have prevented some flow but I actually put it in to prevent the plywood from bowing to keep the end of the step flat.

Just work your way from bottom to top filling with crete, vibrate each section as you go and screed it off. The vibration will cause the next lower section to raise some so once you are done with the highest section then rescreed from highest to lowest (doing the highest section first and lowest section last keeps you from pushing the crete down into the section you just screeded off).

That's what worked for me.
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