Slab on Grade (Edge)
Slab on Grade (Edge)
(OP)
What's your typical detail for the following situations?
1. When a slab on grade terminates against an interior/exterior CMU or concrete wall? Do you have a thickened (turn down) edge or without it? Seems like it would be more work to first grade and compact and then excavate for a downturned edge.
2. When a slab on grade terminates around a concrete column - we typically do a turndown if the footing is 12" below finish grade. Else, my preference is not to do a turndown.
Are there any industry-recommended details for reference? Are there any lessons learned from doing it either way?
Seems like different consultants do it differently.
1. When a slab on grade terminates against an interior/exterior CMU or concrete wall? Do you have a thickened (turn down) edge or without it? Seems like it would be more work to first grade and compact and then excavate for a downturned edge.
2. When a slab on grade terminates around a concrete column - we typically do a turndown if the footing is 12" below finish grade. Else, my preference is not to do a turndown.
Are there any industry-recommended details for reference? Are there any lessons learned from doing it either way?
Seems like different consultants do it differently.






RE: Slab on Grade (Edge)
1. Unless poor soil conditions, typically I detail expansion joint/isolation material between the slab and wall with no turn down edge. If poor soils and shallow frost depth, I'll incorporate the slab edge into the footing design.
2. I do the same
RE: Slab on Grade (Edge)
I am interested in this discussion.
RE: Slab on Grade (Edge)
RE: Slab on Grade (Edge)
Dik
RE: Slab on Grade (Edge)
RE: Slab on Grade (Edge)
When a slab terminates against an interior or exterior wall (concrete or masonry), ie. it is not continuous, I usually thicken the slab as noted and for the reason noted, if there is a chance the slab will see loading.
Dik
RE: Slab on Grade (Edge)
Found this article on ACI's website that talks about the thickened edge. The author's opinion is that it doesn't do much to prevent curling.
https://www.concrete.org/publications/internationa...
Agree that there's no benefit for Item No. 2 of my OP. For Item #1, seems like there's differing opinions. Seems like a lot of additional work and cost for not too much benefit.
RE: Slab on Grade (Edge)
RE: Slab on Grade (Edge)
Dik