Why is my crumb too open and holey?
An overly open, holey crumb is usually caused by over-proofing, weak shaping, or hydration that is too high for the flour's strength. Pull back final proof by 20–30%, build firmer tension during pre-shape and shape, and either reduce hydration or use a higher-protein hard wheat.
Key Takeaways
- Big tunnel holes mean too much gas escaped or pooled, not enough structure.
- Shaping tension determines how gas is distributed during oven spring.
- Fresh milled flour has lower effective gluten than commercial bread flour.
- Over-proofed dough produces both open holes and a flat top.
- Even open crumb is a sign of a healthy bake; tunnel holes are a defect.
Problem
Bread shows large, uneven holes instead of a balanced, even crumb structure.
Symptoms
- One or two huge tunnel holes near the crust.
- Crumb is very uneven — large holes next to dense patches.
- Loaf is wide and flat rather than tall and round.
- Slices fall apart at the holes.
- Crust separates from crumb in places.
Likely causes
Over-proofed dough
Late-stage fermentation produces large pockets that the weakened gluten cannot redistribute in the oven.
Weak or rushed shaping
Without tight surface tension, gas migrates and merges into a few large bubbles.
Hydration too high for the flour
Fresh milled hard white may handle 75%; soft wheat or einkorn may collapse at the same hydration.
Insufficient gluten development
Skipping stretch-and-folds or autolyse leaves dough unable to hold an even structure.
Aggressive degassing skipped
Not pre-shaping or pressing out large bubbles concentrates gas in pockets.
Solutions
- 1
Pull back final proof
Use the poke test — finger should spring back about halfway, not stay indented.
- 2
Pre-shape and bench rest
A firm pre-shape with 20–30 minute rest, then a tight final shape, builds even structure.
- 3
Lower hydration 3–5%
Go from 78% to 73–75% on whole-grain fresh milled until you find your flour's limit.
- 4
Add stretch-and-folds
3–4 sets in the first 2 hours of bulk strengthens gluten without overworking.
- 5
Switch to a stronger flour
Fresh milled hard red or hard white spring wheat has more gluten than soft or einkorn.
- 6
Degas gently during shaping
Press out the very largest bubbles by hand but preserve the smaller bubble structure.