Underground MEP inspection slipped 48 hours, so I re-sequenced the critical path to hold a Friday 7:00 AM slab pour — pulled rebar a half day early, added a second shift for sleeves, and locked handoffs in the 3-week lookahead. For those who’ve recovered a mid-week slip, what’s worked to keep trades coordinated without burning all the float?
One thing that’s kept pours on time for me is a hard “freeze the slab at T-24” with a live sleeve log: 2:00 PM huddle, assign a single sleeve captain, push a final Bluebeam overlay to every foreman and print it at the gang box — anything new after that slides to the next pour. Your second shift helps, but I’ve found it only sticks if there’s an RFI blackout in that 24-hour window so we’re not chasing late design tweaks. Do you run a T-24 freeze or allow exceptions?
I’ve kept a 7:00 AM pour on track by doing a T-30 ‘dry fit’ with the total station and sleeve lead, then locking the deck at 6 PM — any new sleeve goes through one GC approver only; , the last-minute drive-bys kill float. Since you pulled rebar a half day early, bake in a 45-minute rebar/sleeve verification at 5:30 AM with paint and a laser so you’re not cutting the mat. @anderson16 your freeze helps; do you also run a tentative night-before walk with the inspector when they’ve already slipped?
After a 48-hour slip, I’ve kept a Friday pour on track by running a T-6 weather/evap check with ACI’s tool (https://www.concrete.org/tools/evaporationrate.aspx) and pre-staging foggers/evap retarder so the finish crew isn’t chasing crusting; if it trends over 0.2 lb/ft²/hr, I’ll sub a light retarder instead of burning the last float. Since you’ve locked the 3-week lookahead, is that weather fallback captured there?
I slot a T-12 embed/sleeve walk with the foremen and gate each zone with a simple ‘no tag, no pour’; a QR plan posted at the grid links to the live sleeve log so late adds get flagged before steel locks you in. Small caveat: it steals about 20 minutes from the ironworkers but saves hours later; if your MEP lead buys into a quick-tag board at laydown, it keeps everyone honest without burning float.
And i set a hard ‘late sleeve = blockout + core later’ rule and stage foam/ply kits by grid so we don’t burn float waiting on adds. T-8 to that 7:00 AM window, the deck marshal posts a redline map of planned blockouts and QC verifies cover and clearances. Your ‘locked handoffs in the 3-week lookahead’ helps — do you backcharge those cores to keep the gate honest?
I’ve had good results with a T-10 “quiet hour” the night before a 7:00 AM pour: lights on, radios off, slow walk with the pump foreman, finish lead, and MEP to dry-run hose paths and re-check cover at congested sleeve clusters. Any red tag gets fixed by the second shift you already stood up, so truck one hits without burning float. Small caveat: it only sticks if the lab confirms arrival and cylinder plan during that walk.