Preventing Overproofed Sourdough at 80 Degrees (80°F Summer Kitchen) with 18% Starter
Q10=1.46x metabolic curve for 90g starter per 500g flour at 80°F (26.7°C): stop at 4.95 cm bowl height (+30.2% aliquot rise).
Under 80°F (26.7°C) thermal kinetics (Q10=1.46x) and 18% starter (90g/500g), bulk spans 3.2–4.3 hours with a 6.7:1 lactic-to-acetic profile. Terminate fermentation at +30.2% true volumetric expansion (+23.7% vertical height rise in a sloped bowl to 4.95 cm), preventing the +39% volume explosion of a 2x vertical climb.
- Estimated Bulk Time
- 3.2–4.3 hrsAt 80°F (26.7°C) with 18% starter (Q10=1.46x)
- Target Aliquot Volume Rise
- +30.2%Capped volumetric cutoff (<45.5°F dormancy)
- Sloped Bowl Height Target
- 4.95 cm+23.7% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +39% VolCoil fold every 25m (LAB 6.7:1)
Conical Height vs. Aliquot Volume Matrix Centered on 80°F / 18% Starter
5-point neighborhood comparison around 80°F (26.7°C) and 18% starter (90g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 25-min coil fold intervals.
| Temp & Levain Seed (Around 80°F / 18%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 78°F (25.6°C) @ 16% (80g) Cooler / Lower Seed | 4.1–5.3 hrs (246–318m) | +31.2% height (4.0 → 5.25 cm) | +40.4% vol (2x trap: +53.2%) | Every 28 min (Row 1) |
| 80°F (26.7°C) @ 16% (80g) Baseline Temp / Lower Seed | 3.5–4.7 hrs (210–282m) | +23.7% height (4.0 → 4.95 cm) | +30.3% vol (2x trap: +39.1%) | Every 25 min (Row 2) |
| 80°F (26.7°C) @ 18% (90g) [Current Target] | 3.2–4.3 hrs (192–258m) | +23.7% height (4.0 → 4.95 cm) | +30.2% vol (2x trap: +39%) | Every 25 min (Row 3) |
| 80°F (26.7°C) @ 21% (105g) Baseline Temp / Higher Seed | 2.9–3.9 hrs (174–234m) | +23.4% height (4.0 → 4.94 cm) | +29.9% vol (2x trap: +38.6%) | Every 24 min (Row 4) |
| 82°F (27.8°C) @ 21% (105g) Warmer / Higher Seed | 2.4–3.4 hrs (144–204m) | +19.7% height (4.0 → 4.79 cm) | +24.9% vol (2x trap: +31.8%) | Every 21 min (Row 5) |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 3.2–4.3 hrs baseline.
Thermal Momentum Warning at 80°F (27°C): Cut Off 18% Starter Bulk at +30.2% Rise
Symbiotic lag-phase duration for 18% starter (90g/500g flour) at 80°F (26.7°C) is governed by a 1.46x thermal multiplier and a 6.7:1 lactic/acetic trajectory. Once the dough climbs +23.7% vertically to 4.95 cm (+30.2% aliquot volume) between 3.2 and 4.3 hours, yeast dormancy must be induced below 45.5°F.
Calorimetric cooling curves from 80°F (26.7°C) to 45.5°F show residual CO2 generation proportional to 18% inoculation and 1.46x Q10 momentum. Cutting off bulk after 3.2–4.3 hours (25-min fold intervals) at +23.7% sloped-bowl height (4.95 cm / +30.2% volume) guarantees peak oven spring.
4-Stage Bench & Cold-Retard Protocol for 80°F Dough at 18% Starter
- Formula Seeding (90g Starter / 80°F): Fold 18% active starter into your 500g main flour dough at 80°F (26.7°C) (Q10 factor 1.46x).
- Interval Folding (25 Mins Apart): Apply wet-hand coil folds every 25 minutes to reinforce disulfide cross-links during the 3.2–4.3 hr bulk.
- Conical Frustum Inspection (4.95 cm): Verify a +23.7% vertical rise (4.0 → 4.95 cm, equal to +30.2% volume) rather than risking a +39% 2x height explosion.
- Cold Proofing Arrest (<45.5°F): Pre-shape, rest 20 min, final-shape, and load into a 38°F fridge so fermentation tapers off below 45.5°F.
Common Scaling & Troubleshooting Questions (3.2–4.3 hrs)
What percentage rise should I look for at 80°F (26.7°C) with 18% levain?
Target +30.2% true volumetric expansion (+23.7% vertical height rise in a sloped bowl, from 4.0 cm to 4.95 cm) before 38°F cold retarding, avoiding the +39% volume explosion of doubling height.
How many grams of starter is 18% inoculation for a 500g flour loaf at 80°F?
A 18% inoculation on 500g main flour equals 90g of active 100% hydration starter (45g flour + 45g water), fermenting in 3.2–4.3 hours at 80°F.
When should I stop stretching and folding a 80°F dough with 18% starter?
Complete your 25-minute coil fold sets within the first 1.9 hours at 80°F (26.7°C), leaving the final stretch undisturbed until the dough reaches 4.95 cm (+30.2% volume).