Sourdough troubleshooting guide helps bakers fix dense, gummy loaves

Dense, gummy, flat, or scorched on the bottom, a sourdough loaf usually went wrong long before the slice hit the board. A July 1 troubleshooting guide from Foodgeek organizes those failures by symptom and treats them as a diagnosis problem, not a recipe problem. The Bread Code takes the same approach: find the loaf’s visible failure first, then trace it back to starter strength, fermentation, dough handling, or the bake.

Start with the symptom, not the recipe

The fastest way to rescue a frustrating bake is to look at what the bread actually did. A loaf that did not rise, feels wet in the center, spreads into a puddle, tears when scored, or stays pale and soft after baking is telling you something specific about the dough’s condition. Dense crumb, gummy interiors, flat boules, weak oven spring, off sourness, sticky dough, and burnt bottoms do not share one cause.

A baker can use the same flour and still get wildly different results if the starter is sluggish, the dough ferments too long or too short, the gluten never develops properly, or the oven gives too little heat or steam.

Dense loaves usually start before the oven

A heavy, compact crumb most often points to a weak starter, under-fermentation, weak gluten development, or dough that fermented too cold. The fix is straightforward: make sure the starter is reliably doubling in 4 to 8 hours before baking, build the dough until it has risen roughly 50 to 75 percent at room temperature, and keep fermentation warm enough to move, around 24 to 26 C.

King Arthur Baking warns that a starter kept on the counter for a few days, or in the refrigerator for a couple of weeks without feeding, will naturally become less active. That does not mean it is ruined, only that it needs attention before it can lift a loaf with confidence.

King Arthur Baking puts room-temperature bulk fermentation for a typical sourdough bread at 3 to 5 hours, but the actual window depends on the dough temperature and the conditions in the room.

Gummy crumbs are not always underbaked

A wet or gummy crumb can mean the loaf was cut too early, even when the bake itself was adequate. Bread continues setting as it cools, and slicing too soon can tear the crumb and leave a gummy texture behind. In Crust Kingdom’s bread-cooling guide, the cooling period finishes the crumb’s development, which is why a loaf that feels soft at first may slice cleanly later.

If the crust has browned and the loaf sounds hollow but the center still feels tacky, the answer is not always more oven time. Sometimes the bread simply needs to rest long enough for the interior structure to finish setting. A loaf that is cooled properly and still gums up is telling a different story, usually one tied to fermentation balance or insufficient bake heat.

Flat boules, sticky dough, and missing oven spring point to handling

When the dough spreads instead of holding shape, the problem is often in shaping and gluten development, not just hydration. Weak dough handling can leave the loaf without enough structure to trap gas, which shows up as a flat profile, poor scoring, or a loaf that blows out in the wrong place. If the dough turns sticky and slack during shaping, it is usually not ready for the bench or has fermented past the point where it can hold tension.

The same goes for holes that are too large in one area and too tight in another. That uneven crumb often reveals uneven fermentation or uneven shaping, where one part of the dough got more strength or more gas than the rest. It comes from developing gluten, timing bulk properly, and shaping with enough tension to give the loaf a frame.

Flat boules, sticky dough, and weak oven spring can share a root cause, but they do not all point to the same fix. Sometimes the dough needed more folds. Sometimes it needed less time. Sometimes it needed warmer fermentation.

A pale crust, a soft crust, or a burned bottom all point to the bake

The bake is the last place sourdough can go sideways, and its failures are easy to see. A pale crust usually means the loaf did not get enough heat or steam early enough in the oven. A soft crust the next day can mean the bake did not dry the shell sufficiently, or that the loaf cooled in a way that let moisture linger where it should not.

A loaf that burns on the bottom before the top browns is another classic symptom. That is usually a heat-management problem rather than a dough problem, and it can show up even when fermentation and shaping were solid.

Starter management is the quiet foundation

Starter care shapes everything else. King Arthur Baking updated its sourdough starter recipe in February 2026 to make a smaller amount of starter, responding to home baker feedback. The same recipe family has also evolved over time, including putting ingredient weights first for better accuracy.