What You’ll Learn
- Why fermentation affects crumb openness.
- How hydration changes structure.
- How flour strength matters.
- How shaping can tighten crumb.
- When a tight crumb is actually desirable.
Quick Answer
A tight sourdough crumb is commonly caused by under-fermentation, low hydration, weak starter or strong degassing during shaping. First improve fermentation before increasing hydration.
This lesson is part of our Troubleshooting section: “Fix the most common sourdough problems.”
Fermentation
Without enough gas development, crumb remains compact.
Hydration
Lower hydration generally creates a tighter structure.
Flour
Strong flour can support openness; wholegrain often creates a more compact crumb.
Shaping
Very firm degassing can remove too much gas.
Baking
Poor oven spring can reduce final openness.
Is Tight Crumb Bad?
No. Sandwich-friendly sourdough often benefits from a more even, closed crumb.
From Our Workshop
The best crumb is the one that suits how you eat the bread. Butter does not care about Instagram.
Bake Slower Tip
Decide whether you actually want a more open crumb before changing the recipe.
Common Mistake
Do not assume tight crumb automatically means failure.
Today You Learned
- Under-fermentation is a common cause.
- Hydration affects openness.
- Wholegrain tends to tighten crumb.
- Shaping can remove gas.
- Tight crumb can be useful and delicious.
Frequently Asked Questions
How do I get more open crumb?
Improve fermentation first, then adjust hydration and handling.
Is 65% hydration too low?
No.
Does wholemeal make crumb tighter?
Often.
Can overproofing create tight crumb?
Yes, through lost structure.
Should sourdough always have huge holes?
No.
Make the Next Bake Easier
Crumb structure is a result of the whole process, not one magic hydration number.
Continue Learning
Next lesson: Why Is My Sourdough Bread Too Sour?
Troubleshoot one variable at a time
Diagnose from the whole loaf, not one symptom. Compare dough strength, fermentation, proofing, scoring and bake together. Changing several stages at once can hide the real cause and make the next result harder to interpret.