Hi all,
A couple general questions regarding connections between the footer & stemwall:
When incorporating vertical rebar, should it be connected to the horizontal rebar in the footer? if yes, what type of connection do you recommend?
Or is having the vertical rebar bent (i.e., “L” shaped) enough of a connection to the footer?
Finally, is a keying the footer overkill when using vertical rebar?
Thanks for your thoughts !
Replies
yes on the L shaped rebar... 12" leg min... and connected with tie wire..
a key way works best in expansive soils or substancial footers and walls and is the "old" way of doing things..
not overkill by any means...
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Here's the way I do it. There are other methods. Mine takes a two man crew to start.
The two footer bars are already in place sitting on adobies or chairs.
Lay a 20' piece next to the footer trench or form, then position one man at each end. One man ties off the second and third verticle Ell bent bars to the footer bars and the other guy ties off two at the end of the 20' extra piece. Tie the Ells one to each footer bar. Both guys pick up the extra bar and tie it horizontally to the 4 verts.
Then the second guy holds it so the verts don't all tip over while the other ties long brace wires in an inverted Vee to the third vert. After he twists those braces to bring the verticles plumb, he moves 10' down and starts the center pair of verts while the second man is tieing his Vee braces.
Then they both move down 20' and repeat the process.
After the entire footing has the first horizontal wall bar in, tie in all the verts.
SamT
Thanks for the advice guys, this definitely helps out. If it's a 12" wall (24" footer) should the leg of the vert be longer than 12" ?
Chris
Math:
1/2 of 24" footer = 12"
12" - 3" cover =9"
Leg = 9"That assumes one row of verts centered in wall. With a 24" footer, I would lay a third footer 'bar down the center to help support the verticles."Cover" all rebar should be at least 3" from any concrete surface.With a 12" wall, you may have two grids of wall 'bar 6" apart. Then, each vert would be 3" from center on the other side than the footer
'bar the leg stretchs to. That math:
1/2 of footer - cover + 3" to other side :|: leg = 12"And you would have to have a center footer bar. This would also be pretty easy for one man to tie. tie on the third vert with Vee braces, repeat 20' OC around the footing, then tie the horizontals.
SamT
>>That assumes one row of verts centered in wall
Isn't location of the vertical rebar more a function of the amount/type/ height of the fill agianst the wall?
Dave
yesSamT
Ideally, you want the 'L' to wrap around the horizontal bar in your foundation.
A key doesn't hurt - it helps for moisture resistance and adds more shear resistance as well. However, if it is not shown on the drawings, then it is not needed.