Overnight Counter Sourdough Bulk Fermentation at 64 Degrees (64°F / 18°C) with 8% Starter
Thermal carryover modeling into a 38°F retarder from 64°F (17.8°C) at 8% levain: target +71.7% vertical climb (6.87 cm).
Under 64°F (17.8°C) thermal kinetics (Q10=0.44x) and 8% starter (40g/500g), bulk spans 19.3–25.7 hours with a 2.9:1 lactic-to-acetic profile. Terminate fermentation at +75% true volumetric expansion (+71.7% vertical height rise in a sloped bowl to 6.87 cm), preventing the +146.9% volume explosion of a 2x vertical climb.
- Estimated Bulk Time
- 19.3–25.7 hrsAt 64°F (17.8°C) with 8% starter (Q10=0.44x)
- Target Aliquot Volume Rise
- +75%Capped volumetric cutoff (<43.6°F dormancy)
- Sloped Bowl Height Target
- 6.87 cm+71.7% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +146.9% VolCoil fold every 47m (LAB 2.9:1)
Conical Height vs. Aliquot Volume Matrix Centered on 64°F / 8% Starter
5-point neighborhood comparison around 64°F (17.8°C) and 8% starter (40g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 47-min coil fold intervals.
| Temp & Levain Seed (Around 64°F / 8%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 62°F (16.7°C) @ 6% (30g) Cooler / Lower Seed | 27.7–37 hrs (1662–2220m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 50 min (Row 1) |
| 64°F (17.8°C) @ 6% (30g) Baseline Temp / Lower Seed | 23.9–31.9 hrs (1434–1914m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 47 min (Row 2) |
| 64°F (17.8°C) @ 8% (40g) [Current Target] | 19.3–25.7 hrs (1158–1542m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 47 min (Row 3) |
| 64°F (17.8°C) @ 11% (55g) Baseline Temp / Higher Seed | 15.2–20.2 hrs (912–1212m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 46 min (Row 4) |
| 66°F (18.9°C) @ 11% (55g) Warmer / Higher Seed | 13.3–17.2 hrs (798–1032m) | +68.7% height (4.0 → 6.75 cm) | +75% vol (2x trap: +139%) | Every 43 min (Row 5) |
Custom Batch Recalculation Engine
Fine-tune starter hydration between 50% stiff and 125% liquid while keeping your bulk fermentation temp × inoculation ratios locked.
Overnight Cold-Counter Kinetics at 64 Degrees (64°F / 18°C): Target +75% Rise
Endogenous cereal protease (aspartic proteinase) cleaves disulfide-linked glutenin macropolymers at a Q10 rate of 0.44x when dough sits at 64°F (17.8°C). Under a 8% levain load, extending bulk past 25.7 hours or beyond 6.87 cm (+71.7% height / +75% volume) risks irreversible slackening toward the +146.9% conical trap.
Enzymatic alpha-amylase dextrinization and acid proteolysis (2.9:1 lactic-to-acetic ratio) persist during initial 38°F cooling until internal temperature drops through 43.6°F. Starting cold retard from 64°F (17.8°C) at +75% volume (6.87 cm conical height after 19.3–25.7 hrs at 8% seed) safeguards gluten film thickness.
4-Stage Bench & Cold-Retard Protocol for 64°F Dough at 8% Starter
- Seed & Thermal Check (64°F / 17.8°C): Verify dough core reads 64°F after incorporating 40g active levain (8% baker's math) for a 2.9:1 LAB balance.
- Aliquot & Sloped Vessel Setup: Place 40g dough in a straight cylinder (mark +75%) and set a ruler at 6.87 cm (+71.7% climb) on your 24 cm sloped bowl.
- Gluten Alignment (47-Min Intervals): Perform gentle folds every 47 minutes without degassing; stop folding 90 minutes before hour 19.3.
- Bench Preshape & 38°F Retard: Dump onto the bench between 19.3 and 25.7 hours at +75% rise, tension-roll, and refrigerate immediately until core drops past 43.6°F.
Technical Q&A: Overnight Counter Sourdough Bulk Fermentation at
Why did my 64°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 +146.9% volume explosion instead of the recommended +75% true volumetric expansion (+71.7% vertical height rise in a sloped bowl to 6.87 cm).
How does 8% starter affect sourness and lactic-to-acetic ratio at 64°F?
Fermenting with 8% levain at 64°F (17.8°C) produces an estimated 2.9:1 lactic-to-acetic organic acid ratio across 19.3–25.7 hours before shaping at +75% rise.
How do I adjust 64°F bulk time if I drop starter from 8% to 6%?
Reducing inoculation from 8% to 6% at 64°F (17.8°C) extends the 19.3–25.7 hr bulk window while keeping the same +75% volumetric (6.87 cm height) shaping target.