Sourdough Bulk Fermentation Time at 72 Degrees (72°F / 22°C) with 22% Starter (+64.7% Rise)
Sloped-bowl frustum geometry at 72°F (22.2°C) and 22% inoculation: 33-min coil fold intervals and +64.7% cold-retard cutoff.
With 22% levain (110g/500g flour) at 72°F (22.2°C), microbial CO2 production (LAB ratio 5.2:1) reaches shaping readiness in 5.1–6.5 hours. Target +64.7% true volumetric expansion (+48.4% vertical height rise in a sloped bowl, hitting 5.94 cm) before 38°F cold retarding—waiting for doubled vertical height triggers a +89.1% volume explosion.
- Estimated Bulk Time
- 5.1–6.5 hrsAt 72°F (22.2°C) with 22% starter (Q10=0.8x)
- Target Aliquot Volume Rise
- +64.7%Capped volumetric cutoff (<44.3°F dormancy)
- Sloped Bowl Height Target
- 5.94 cm+48.4% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +89.1% VolCoil fold every 33m (LAB 5.2:1)
Arrhenius Kinetics & Coil-Fold Schedule Matrix Around 72°F (22% Inoculation)
5-point neighborhood comparison around 72°F (22.2°C) and 22% starter (110g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 33-min coil fold intervals.
| Temp & Levain Seed (Around 72°F / 22%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 70°F (21.1°C) @ 20% (100g) Cooler / Lower Seed | 6.5–8 hrs (390–480m) | +53.7% height (4.0 → 6.15 cm) | +72.5% vol (2x trap: +101.3%) | Every 36 min (Row 1) |
| 72°F (22.2°C) @ 20% (100g) Baseline Temp / Lower Seed | 5.5–7 hrs (330–420m) | +48.6% height (4.0 → 5.94 cm) | +65% vol (2x trap: +89.6%) | Every 33 min (Row 2) |
| 72°F (22.2°C) @ 22% (110g) [Current Target] | 5.1–6.5 hrs (306–390m) | +48.4% height (4.0 → 5.94 cm) | +64.7% vol (2x trap: +89.1%) | Every 33 min (Row 3) |
| 72°F (22.2°C) @ 25% (125g) Baseline Temp / Higher Seed | 4.7–5.9 hrs (282–354m) | +48.1% height (4.0 → 5.92 cm) | +64.2% vol (2x trap: +88.4%) | Every 31 min (Row 4) |
| 74°F (23.3°C) @ 25% (125g) Warmer / Higher Seed | 4.1–5.1 hrs (246–306m) | +41.2% height (4.0 → 5.65 cm) | +54.3% vol (2x trap: +73.4%) | Every 29 min (Row 5) |
Interactive Bulk Fermentation Temp × Inoculation Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
When to Stop Bulk Fermentation at 72 Degrees (72°F / 22°C): Target +64.7% Rise
Gas-cell nucleation physics at 72°F (22.2°C) and 22% inoculation depends on preventing Laplace-pressure coalescence during the 5.1–6.5 hr bulk phase. Re-laminating the gluten film every 33 minutes subdivides alveoli cleanly up to +64.7% volume (5.94 cm conical height), avoiding the +89.1% overproofed blowout.
Enzymatic alpha-amylase dextrinization and acid proteolysis (5.2:1 lactic-to-acetic ratio) persist during initial 38°F cooling until internal temperature drops through 44.3°F. Starting cold retard from 72°F (22.2°C) at +64.7% volume (5.94 cm conical height after 5.1–6.5 hrs at 22% seed) safeguards gluten film thickness.
4-Stage Bench & Cold-Retard Protocol for 72°F Dough at 22% Starter
- Levain Inoculation (22% / 110g): Dispersion-mix 110g peaked starter (55g F + 55g W) into 500g flour tempered to 72°F (22.2°C).
- Rheological Coil Folds (33-Min Cadence): Execute damp-hand coil folds every 33 minutes during the first half of the 5.1–6.5 hr window (Q10=0.8x).
- Frustum Height Cutoff (5.94 cm): Track bowl climb from 4.0 cm to 5.94 cm (+48.4% height = +64.7% aliquot volume); never wait for 8.0 cm (+89.1% trap).
- Thermal Arrest (<44.3°F Core): Preshape, bench rest 20 min, stitch into a banneton, and chill at 38°F so core activity halts below 44.3°F.
Frequently Asked Questions for This Bulk Fermentation Temp × Inoculation Spec
How do I adjust 72°F bulk time if I drop starter from 22% to 20%?
Reducing inoculation from 22% to 20% at 72°F (22.2°C) extends the 5.1–6.5 hr bulk window while keeping the same +64.7% volumetric (5.94 cm height) shaping target.
What is the Q10 metabolic speed factor at 72°F (22.2°C)?
At 72°F (22.2°C), sourdough yeast and LAB operate at a 0.8x Q10 velocity relative to 75°F, yielding a 5.2:1 lactic-to-acetic acid ratio over 5.1–6.5 hours at 22% starter.
How many grams of starter is 22% inoculation for a 500g flour loaf at 72°F?
A 22% inoculation on 500g main flour equals 110g of active 100% hydration starter (55g flour + 55g water), fermenting in 5.1–6.5 hours at 72°F.