:confused: I've read all the answers on How to build a cinder block wall using re-bar and concrete. My question is: How is the re-bar set in the footing to secure it and keep it standing straight up. Is the concrete put into the footing, a cinder block put down onto the wet concrete and then the re-bar is stuck into the center of the cinder block and pushed into the wet concrete? What makes it stand vertical? Just the concrete in the footing?

Yes, just the concrete will allow the rebar to stand vertical and the blocks on on after the footing cures, not while wet. See these photos, might help.

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You will need exact and detailed building plans before building anything structural that would actually need these rebars that will tell you exactly where to put them, how far apart, what diameter of rebar to use, etc. There are civil engineering calculations involved based on the exact site you are building type of soil, height of wall, strenth of foundation, strenth of concrete mixture etc. etc. Just because someone else's project had thus and such, you cannot safely assume yours is OK the same way. But basically you most often have a grid of rebars running in both directions and you attach the vertical ones to the horizontal ones with a wrapping of wire. If using concrete blocks instead of solid concrete you do indeed drop the bars inside (or they are already wired to the horizontal foundation rebars) and if you need more than one bar you make a lap joint that is covered with wire. Realize that the cement is more liquid when you pour, you can wiggle the bars around to center them before the mix solidifies. Some will anchor a rebar to the form with disposable ties or use small blocks of wood or stones to get it into position or simply hook the rebar after the pour with a tool to wiggle it around after pouring to get it into an exact position.

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Originally Posted by amricca

yes, just the concrete will allow the rebar to stand vertical and the blocks on on after the footing cures, not while wet. See these photos, might help.

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Thank you! You've answered my question.

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Originally Posted by wildandblue

You will need exact and detailed building plans before building anything structural that would actually need these rebars that will tell you exactly where to put them, how far apart, what diameter of rebar to use, etc. There are civil engineering calculations involved based on the exact site you are building type of soil, height of wall, strenth of foundation, strenth of concrete mixture etc. etc. Just because someone else's project had thus and such, you cannot safely assume yours is OK the same way. But basically you most often have a grid of rebars running in both directions and you attach the vertical ones to the horizontal ones with a wrapping of wire. If using concrete blocks instead of solid concrete you do indeed drop the bars inside (or they are already wired to the horizontal foundation rebars) and if you need more than one bar you make a lap joint that is covered with wire. Realize that the cement is more liquid when you pour, you can wiggle the bars around to center them before the mix solidifies. Some will anchor a rebar to the form with disposable ties or use small blocks of wood or stones to get it into position or simply hook the rebar after the pour with a tool to wiggle it around after pouring to get it into an exact position.

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Thank you for the additional information about building and plans. You've answered my question and I understand it now. Thanks a lot.