Sourdough Bulk Fermentation Time at 76 Degrees (76°F / 24°C) with 22% Starter (+46.4% Rise)
Sloped-bowl frustum geometry at 76°F (24.4°C) and 22% inoculation: 28-min coil fold intervals and +46.4% cold-retard cutoff.
A 22% starter build (110g levain) held at 76°F (24.4°C) matures in 3.9–4.8 hours when strengthened at 28-minute intervals. Transfer to cold proof at +46.4% true volumetric expansion (+35.6% vertical height rise in a sloped bowl, or 5.42 cm); doubling vertical height produces a destructive +61.8% volume explosion.
- Estimated Bulk Time
- 3.9–4.8 hrsAt 76°F (24.4°C) with 22% starter (Q10=1.08x)
- Target Aliquot Volume Rise
- +46.4%Capped volumetric cutoff (<44.8°F dormancy)
- Sloped Bowl Height Target
- 5.42 cm+35.6% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +61.8% VolCoil fold every 28m (LAB 6.0:1)
Arrhenius Kinetics & Coil-Fold Schedule Matrix Around 76°F (22% Inoculation)
5-point neighborhood comparison around 76°F (24.4°C) and 22% starter (110g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 28-min coil fold intervals.
| Temp & Levain Seed (Around 76°F / 22%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 74°F (23.3°C) @ 20% (100g) Cooler / Lower Seed | 4.8–6 hrs (288–360m) | +41.7% height (4.0 → 5.67 cm) | +55% vol (2x trap: +74.4%) | Every 31 min (Row 1) |
| 76°F (24.4°C) @ 20% (100g) Baseline Temp / Lower Seed | 4.2–5.2 hrs (252–312m) | +35.8% height (4.0 → 5.43 cm) | +46.7% vol (2x trap: +62.2%) | Every 29 min (Row 2) |
| 76°F (24.4°C) @ 22% (110g) [Current Target] | 3.9–4.8 hrs (234–288m) | +35.6% height (4.0 → 5.42 cm) | +46.4% vol (2x trap: +61.8%) | Every 28 min (Row 3) |
| 76°F (24.4°C) @ 25% (125g) Baseline Temp / Higher Seed | 3.5–4.4 hrs (210–264m) | +35.3% height (4.0 → 5.41 cm) | +46.1% vol (2x trap: +61.3%) | Every 27 min (Row 4) |
| 78°F (25.6°C) @ 25% (125g) Warmer / Higher Seed | 3–3.8 hrs (180–228m) | +30.6% height (4.0 → 5.22 cm) | +39.5% vol (2x trap: +51.9%) | Every 25 min (Row 5) |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 3.9–4.8 hrs baseline.
When to Stop Bulk Fermentation at 76 Degrees (76°F / 24°C): Target +46.4% Rise
Arrhenius Q10 kinetics at 76°F (24.4°C) scale wild yeast metabolic velocity by 1.08x relative to a 75°F baseline. With a 22% starter seed (110g levain per 500g flour), exponential log-phase budding spans 3.9 to 4.8 hours, requiring coil folds every 28 minutes before reaching the +46.4% volumetric cutoff (5.42 cm in a sloped bowl).
When dough at 76°F (24.4°C) and 22% starter enters cold storage after 3.9–4.8 hours, heterofermentative bacteria remain active down to 39°F even after yeast halts at 44.8°F. Locking bench rise at +46.4% (+35.6% height to 5.42 cm) balances the 6.0:1 acid profile and avoids +61.8% over-expansion.
4-Stage Bench & Cold-Retard Protocol for 76°F Dough at 22% Starter
- Thermal & Levain Calibration (76°F @ 22%): Blend 110g peaked levain into 500g flour at 76°F (24.4°C) to initiate the 3.9–4.8 hr fermentation clock.
- Lamination & 28-Min Folds: Strengthen gluten sheets every 28 minutes as LAB fermentation develops a 6.0:1 organic acid ratio.
- Volumetric vs. Linear Check (+46.4% / 5.42 cm): Call bulk complete at +46.4% aliquot expansion (+35.6% bowl height), bypassing the +61.8% doubling trap.
- Rapid Chilling Protocol (44.8°F Threshold): Stitch tightly in a breathable banneton and chill at 38°F (3.3°C) until core temperature falls below 44.8°F.
Common Scaling & Troubleshooting Questions (3.9–4.8 hrs)
Can I cold-retard a 76°F (22% starter) dough for 16 hours after bulk?
Yes—provided you terminate bench fermentation at +46.4% true volumetric expansion (5.42 cm sloped height) after 3.9–4.8 hrs so thermal carryover to 44.8°F does not overproof the gluten.
Should I use an aliquot jar or bowl ruler for 76°F bulk fermentation at 22% levain?
Either works when calibrated: look for +46.4% true volumetric expansion in a straight-walled aliquot jar, or +35.6% vertical height rise in a sloped bowl (4.0 cm to 5.42 cm) over 3.9–4.8 hrs.
Why did my 76°F dough overproof when I waited for it to double in height?
In a 24 cm sloped bowl, doubling vertical height from 4.0 cm to 8.0 cm causes a +61.8% volume explosion instead of the recommended +46.4% true volumetric expansion (+35.6% vertical height rise in a sloped bowl to 5.42 cm).