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The loaf collapsed or sank

The loaf lost height — dropping as it entered the oven, sinking in the middle during the bake, or caving in as it cooled.

Usually established at: fermenting

Narrow it down

Answer what you can. Anything you skip simply leaves its causes in play — there is no requirement to answer everything, and no answer is treated as more authoritative than what you actually saw.

When did it lose its height?
How far had it proved before it went in?
What is the crumb like where it sank?
What was in the flour?
How did the dough behave once it was shaped?

All 5 possible causes are shown below. Answer a question above to start ruling them out.

Every possible cause

The complete model, whatever you answered above. Each cause states the mechanism — what physically happens — because a cause without a mechanism is folklore with a confident tone.

Overproofed

Common

Fermentation continues to produce gas, while the flour’s own enzymes and the acidity of a long fermentation progressively degrade the gluten network. Past a point the network can no longer retain what is being produced. The dough is at maximum volume just before this, and collapses during or immediately after loading into the oven.

What to change

  • Judge proofing by the dough, not the clock

    Press a floured fingertip about a centimetre into the dough. If the indentation springs back fully and quickly it needs longer. If it springs back slowly and partly, it is ready. If it does not spring back at all and the surface may sag, it has gone too far.

    Any yeasted or naturally leavened dough at final proof. Less informative during bulk fermentation, where volume and surface condition are better guides.

    Trade-off: Requires handling the dough, which slightly disturbs the surface. This is immaterial compared with baking at the wrong point.

Gluten was not developed enough

Common

Gas retention depends on a continuous, elastic gluten network. An underdeveloped network has weak points that tear as cells expand, so gas escapes rather than inflating the loaf. The dough may still rise in the bowl and then fail to hold that rise once shaped and loaded.

What to change

  • Develop the dough further

    Continue kneading until the dough is smooth and springy and passes a windowpane test, or add two or three stretch-and-fold sets spaced through bulk fermentation. For wet doughs the folds are the more practical route.

    Any bread dough that tears easily or spreads rather than holding shape. The windowpane test is unreliable on wholemeal and very wet doughs.

    Trade-off: Over-development is possible in a powerful mixer, though rarely by hand.

Too much water for the blend

Common

Gluten-free formulations need considerably more water than wheat ones, which makes over-shooting easy and its signature confusing. Excess free water keeps the starch gel soft, so the crumb reads as gummy and under-set even after a full bake, and the extra water has to leave during baking or it stays in the middle as a damp, close band.

The variable underneath

  • Hydration

    How to tell after the fact: A tight, close crumb from a dough that was stiff throughout indicates hydration too low — most commonly when wholemeal or rye flour was used with a recipe written for white.

What to change

  • Use less liquid

    Cut the liquid back, and check what the flours in your blend actually absorb — a starch-heavy blend takes considerably less water than a wholegrain one, so the same figure suits neither.

    Applies where the crumb is damp and gummy and the bake reached temperature. It does not apply where the bake was simply short of time, which produces a similar-looking crumb for an entirely different reason.

    Trade-off: Gluten-free bakes go dry quickly, and reducing water accelerates it. This is the fix most likely to trade one fault for another.

It came out of the oven too early

Very common

Gummy crumb is most often simply raw crumb. Starch needs both sufficient temperature and sufficient time at it to gelatinise fully and then set; a loaf pulled when the crust looks right can still be short of that at the centre. Dark crusts mislead here, because crust colour is a surface reaction and says nothing about the middle.

The variable underneath

  • Oven temperature

    How to tell after the fact: A bake that consistently needs longer than stated and comes out pale is the signature of an oven running cool. One that browns before the centre sets is running hot. Several unrelated recipes failing the same way is the strongest single indicator.

What to change

  • Bake it longer, and judge doneness inside rather than by the crust

    Give the loaf longer, covering the top if it is colouring faster than the inside is setting. Judge it by internal temperature rather than by appearance — a lean loaf is done at a temperature close to boiling point at its centre, and a thermometer answers in seconds a question that guessing gets wrong repeatedly.

    Applies where the crumb is dense and damp throughout. It does not apply where only a band near the cut is gummy and the rest is fine, which points to cutting too early.

    Trade-off: A longer bake means a thicker, darker crust. Covering the loaf mitigates this at the cost of some crust crispness.

Enzyme activity broke down too much starch

Occasional

Amylase enzymes break starch into sugars. A degree of this is wanted — it feeds fermentation and aids browning — but where activity is high, too much of the starch that should have gelatinised and set is degraded instead, and the crumb cannot firm. Rye is markedly more prone to this than wheat, which is why rye breads are traditionally acidified heavily: the low pH restrains the enzymes.

What to change

  • Restrain the enzymes, or use less of the flour causing it

    Where a high proportion of rye or sprouted grain is involved, either reduce that proportion or ensure the dough is properly acidified by a mature sour — the low pH restrains the amylase activity that is degrading the starch. Both routes address the same mechanism.

    Applies to rye-heavy and sprouted-grain breads. It is not the answer for a straightforward wheat loaf, where underbaking is far more likely.

    Trade-off: Reducing the rye changes the bread into a different bread. Acidifying takes longer and produces a more sour result.

Preventing it next time

  • Judge the final proof by how the dough responds rather than by the clock, and err on the early side — under-proofing is the cheaper mistake.
  • Check the internal temperature rather than the colour of the crust, because a loaf can look finished several minutes before it is.
  • Treat a rye or high-rye dough as a different problem rather than as a wheat dough that misbehaved.
  • Let it cool completely before cutting, because a warm loaf is still setting.

“It collapsed, so it was over-proved” is right about half the time

Over-proving is the commonest cause and it is not the only one, and the three are easy to tell apart because they collapse at different moments.\n\nAN OVER-PROVED LOAF collapses when it is disturbed — as it is turned out, as it is scored, or in the first minute of heat. The gluten has been stretched past the point where it can hold what fermentation has produced, and the trigger is mechanical.\n\nAN UNDERBAKED LOAF collapses on cooling, because the starch structure had not finished setting and the crumb cannot support itself once the steam pressure inside it drops. It looks fine coming out of the oven, which is what makes this one frustrating.\n\nA WEAK LOAF never got there in the first place. It flowed outwards during proving rather than upwards, and what looks like collapse is really a shape that was never established.\n\nThe timing tells you which, which is why it is the first question asked.

Related

Possible causes

  • Overproofed

    The commonest cause, and it collapses on being disturbed — turning out, scoring, or the first minute of heat.

  • Gluten was not developed enough

    A network too weak to hold the gas it was given. The loaf flowed outwards during proving rather than losing height suddenly.

  • Too much water for the blend

    Past a point the dough behaves as a viscous liquid rather than an elastic solid, and it spreads rather than standing up.

  • It came out of the oven too early

    The distinguishing case: it collapses on COOLING, because the starch structure never finished setting and cannot support itself once the internal steam pressure drops.

  • Enzyme activity broke down too much starch

    Rye, sprouted grain and added malt carry enzyme activity that degrades starch during the bake, leaving a crumb that cannot set. Scoped to those grains rather than treated as a general risk.

Where this happens

  • White bread

    Recorded because the demand data asks about this fault under this product’s name, not because the fault is peculiar to it.

  • Sourdough bread

    Recorded because the demand data asks about this fault under this product’s name, not because the fault is peculiar to it.

  • Brioche

    Recorded because the demand data asks about this fault under this product’s name, not because the fault is peculiar to it.

  • Challah

    A braided enriched loaf carries its own weight poorly once over-proved.

  • Baguette

    Collapse shows as spreading rather than sinking, and the timing question still separates the causes.

  • Ciabatta

    Overfermentation at high hydration is the classic route to a ciabatta that spreads.

  • Rye bread

    Enzyme activity breaking down starch is one of this model’s causes and is rye’s characteristic failure.

  • Milk bread

    A tall tin loaf with a soft crumb has somewhere to fall.

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