Troubleshooting

Why is my sourdough dense? Causes in order of likelihood

A dense loaf has one of a short list of causes, and they are worth checking in order, because the first one explains most cases and the others explain almost all of the rest.

1. Underfermentation

The dough did not ferment long enough, or warm enough, or with a strong enough levain. This is the cause behind most dense sourdough, in home kitchens and in bakeries.

Signs: the loaf is dense but not flat, often tall with a rounded top and a tight, even crumb; sometimes a large tunnel sits under the crust where the gas that did form collected. The crust is pale and thick because the sugars that brown it were never released. The taste is flat rather than sour.

Where it comes from:

• The levain was not at peak. Used too young it lacks the yeast population to do the work. Used hours past peak it has begun to acidify and weaken.
• Bulk was ended by the clock. A recipe written for a 26 °C kitchen and followed in a 20 °C bakery ends bulk with the dough half done. Dough temperature, not time, is what decides.
• Too little levain for the time available. Ten percent levain and four hours of bulk at 22 °C is not a bread, it is an autolyse with ambitions.

Fix: measure dough temperature at the end of mixing and let bulk run until the dough has grown by half and domes at the edges. If that takes longer than the schedule allows, raise the dough temperature or the levain percentage, not both at once.

2. A starter that has lost its strength

A neglected starter, one fed irregularly or left too long between feeds, leavens weakly even when it looks lively. Bakeries see this after a day off. The fix is two or three feeds at a moderate ratio, at a warm temperature, before relying on it.

A starter that smells of acetone or has a grey liquid on top is hungry, not dead. Feed it and give it a day.

3. Weak flour, or too much whole grain

Flour below about 11 percent protein struggles to hold gas through a long sourdough fermentation, and a dough with more than 30 percent whole wheat or rye has bran cutting through what gluten there is. Both bake dense even when the fermentation was right.

Signs: the dough felt slack during bulk and spread on the bench; the crumb is close but not gummy.

Fix: a stronger flour, or a lower share of whole grain, or less water. Whole-grain loaves are denser by nature; a 100 percent wholemeal sourdough at the same density as a white one is not a fault.

4. Degassing at shaping

Rough handling at preshape and shape knocks out the gas that bulk built. A dough shaped tight with too much flour on the bench and too much pressure loses its aeration, and the final proof cannot rebuild it in the time available.

Signs: the dough looked well fermented in the tub but the loaf is tight anyway.

Fix: shape with a lighter hand, and if the dough is slack enough to need force, the fault is in the strength, not in the shaping.

5. Too short a final proof

After shaping the dough needs time to relax and rise again. Baked too early it springs hard in the oven, tears at the score, and the crumb is tight near the base. Cold-proofed loaves that go from a 4 °C fridge straight into the oven need to have proofed enough before they went in.

The poke test helps: a fingertip pressed into the dough should leave a dent that springs back slowly and not quite fully.

6. Underbaking

A gummy, dense layer near the base with an otherwise open crumb is underbaking, not underfermentation. Internal temperature at the end of the bake should be 93 °C or above for a lean loaf; with a covered bake, take the lid off for the second half to let steam out.

The two you can rule out quickly

Too much salt slows fermentation but does not cause density on its own below about 2.5 percent. Overfermentation does not produce a dense loaf in the usual sense; it produces a flat, spread one with a wet, sour crumb.

Prevention, in a bakery

Two records prevent almost all of the above: the starter’s feeding times and ratio, and the dough temperature at the end of each mix. With those two written down, a dense day has a cause you can point to by lunchtime, and the loaf after the rest day is not a gamble.

Questions bakers ask

Why is my sourdough dense and gummy?

Gummy and dense together points to underfermentation, sometimes with underbaking on top. The crumb never developed the gas structure to set around, so it stays wet and close. Longer bulk at a known dough temperature fixes most cases.

Is dense sourdough underproofed or overproofed?

Nearly always under. Overproofed dough spreads flat and has large holes near the top with a tight, sour bottom. Underproofed dough holds a tall shape but the inside is tight and even, often with a tunnel under the crust.

Can a weak starter cause dense bread?

Yes, and it is the most common cause in a bakery after a rest day. A starter that has not been fed on schedule, or was used well past its peak, leavens slowly and acidifies the dough before it has risen.

Related

• How long to bulk ferment sourdough, and how to tell when it is done. Bulk fermentation is done when the dough has grown 30 to 75 percent, domes at the edges and jiggles as one mass. At 24 to 26 °C that takes four to six hours.
• Sourdough starter feeding schedule, worked back from mix time. Feed the starter so it peaks at the moment you mix. The feeding ratio and the temperature are the two timers; set them for your mix time and the schedule writes itself.
• Flour protein content for bread: what the number means and what to buy. Bread flour runs 11.5 to 13.5 percent protein; under 11 is pastry, over 14 suits enriched doughs and long fermentations. Protein quality matters as much as the number.

Sources: Hamelman, Bread, 3rd ed.; Robertson, Tartine Bread; Suas, Advanced Bread and Pastry. Updated 2026-09-09.