Residential Slab Footing - Two Pour
Residential Slab Footing - Two Pour
(OP)
Hello, I have an architect that disagrees with my detail for the exterior footing of the slab. It is detailed as a two pour slab and I have shown the 12" wide, 12" deep footing with the inside top of footing angled at 45 degrees toward the exterior edge instead of the typical 45 degrees toward the interior of the slab.
I was told that as long as the cold joint at the top meets the minimum stemwall width (6"), that inside corner area in question could be angled either way.
Any help would be appreciated, thank you.
I was told that as long as the cold joint at the top meets the minimum stemwall width (6"), that inside corner area in question could be angled either way.
Any help would be appreciated, thank you.






RE: Residential Slab Footing - Two Pour
DBD
RE: Residential Slab Footing - Two Pour
The concern is with the direction of the chamfer between the slab and the footing. Picture a cross-sectional view with the slab sitting on top of the 12" deep, 12" thick exterior wall footing. Some will draw the inside line of the 12" thick footing straight up (to the bottom of the slab), some will draw it 45 degrees away from the footing (to the bottom of the slab) and I have drawn it 45 degrees towards the stemwall, leaving only the minimum 6" width for the cold joint between the slab and the footing.
This is gonna be rough! And it's so clear in my head....
RE: Residential Slab Footing - Two Pour
RE: Residential Slab Footing - Two Pour
Maybe this will help......
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1 1 instead of 1 1
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RE: Residential Slab Footing - Two Pour
RE: Residential Slab Footing - Two Pour
1) I don't see why you'd have a cold joint on top of a footing. We wouldn't specify a footing having a cold joint in the top portion of it, we'd place it in the beam somewhere, preferably not at the end of a beam.
2) As far as slope of the footing, we leave it straight (vertical), with a slight slope towards the interior which simply is easier for the contractor to form (since the soil at the edge tends to fall into the footing). This is what a typical exterior footing looks like for us:
____________________
| ________
| /
| |
|_________|
Disclaimer: I'm still not perfectly sure this is what you're talking about. If it is, and I were you, I'd thank the architect for the advice, and change my detail.
RE: Residential Slab Footing - Two Pour
_________________
| _________
| /
| |
| |
if this doesn't work, i'm giving up.
RE: Residential Slab Footing - Two Pour
Why not place the slab monolithically. What you are trying to do is not the normal way of doing it. I always use 45-degree slop when the slab transitions into the footing.
Regards,
Lutfi
RE: Residential Slab Footing - Two Pour
In any case, I would say the extra concrete is worth avoiding the hassle of forming the inside edge at an angle.
I also agree with Lutfi that a monolithic pour would be best. One mobilization is always cheaper than two.
RE: Residential Slab Footing - Two Pour
RE: Residential Slab Footing - Two Pour
Thank you everyone for your ideas/opinions......