Slab pour at door

[JStructsteel]

For a commercial building, do you show the slab pour thru to the outside of the curtain wall and door, or keep the foundation wall up and stop the slab as normal, and then they use a threshold across the joint? Or do you not get that into the weeds and let the contractor/arch figure it out?

 

[jayrod12]

Around here, we would generally have an upstand on the gradebeam (for a structural slab) or just project the gradebeam (for slab-on-grade). I have however had situations where we poured the slab to the outside edge.

 

[dik]

In these environs it's common to pour the slab to the gradebeam... slab and gradebeam at same elevation.

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-Dik

 

[JStructsteel]

Thanks. The gradebeam is to the top of slab. Slab is floating. I will do that, the Arch drawings are not clear, so must not be a pref either way.

 

[jayrod12]

Most doors I've installed all have a metal threshold at the bottom, so as long as there's something for that to sit on then I doubt they'd care.

 

[phamENG]

Here in the mid-Atlantic, we float slabs on grade over the foundation wall with a bit of a turn down. So there are typically re-entrant corner bars at the ends and then bars with hooks in the turn down to resist cracking at that line of restraint. No bars between the slab and wall, though. I've seen some go as far as specifying a bond break between the foundation wall and turn down.

 

[Ron]

My experience is similar to phamENG...

 

[JedClampett]

We continue the slab through the stem wall (or grade beam). Our architects have noticed that the stem walls are finished to get CMU installed(just screeded off), so if you hold them down, the finish continues through the door. Thresholds hide some of the rough finish, but they're only about 5 inches wide. My note states "hold stem wall down and continue slab through door"
If there's cracking, it must be pretty minor.