When the dough just keeps tearing
You stretch a little piece of dough between your fingers, hoping to see that beautiful, translucent, see-through membrane that every sourdough YouTuber promises. Instead it rips. You try again. It rips. You knead for another 10 minutes. Still rips.
First: take a breath. The windowpane test is useful, but it’s not the final word on whether your dough is ready. Plenty of great sourdough is baked from dough that never technically passes the windowpane. Here’s what’s actually happening and what to do about it.
Failing the windowpane test and failing bulk fermentation are two different problems. The windowpane measures gluten strength only — the bulk fermentation chart is what tells you whether fermentation itself is complete.
What the windowpane test actually tells you
The windowpane test checks gluten development. Take a small piece of dough, stretch it gently, and look for:
- A thin, translucent film you can see light through
- Stretch without tearing
- Smooth, elastic resistance
If you see that, gluten is well-developed. If the dough tears before it thins out, gluten isn’t there yet.
But here’s the thing the purists don’t tell you: sourdough doesn’t usually need to pass a full windowpane test, because the long bulk fermentation continues to develop gluten all on its own.
👉 Related: Sourdough folding techniques guide · Sourdough autolyse guide
Cause #1: You’re testing too early (most common mistake)
For yeasted bread with a 1-hour rise, you want near-full gluten development before the rise. For sourdough with a 4-8 hour bulk, that’s the opposite of what you want. Fully developed gluten + 8 hours of fermentation = over-fermented dough with degraded gluten.
What to do:
- Target 60–80% gluten development before bulk fermentation
- Your dough should feel cohesive, smooth on top, elastic but still slightly tearable when stretched
- The stretch-and-folds during bulk will finish the gluten network
- Don’t chase a perfect windowpane after mixing — that’s for pizza dough, not sourdough
Cause #2: You’re testing a piece that’s too big
The windowpane test works on a golf-ball-sized piece, not a handful. Too much dough and surface tension prevents the stretch from thinning out evenly — it tears before you get a real read.
How to fix it:
- Pinch off a piece about the size of a walnut
- Flatten gently between your fingers first
- Stretch slowly, moving from edges to center
- Let it rest 30 seconds first if it’s resisting
Cause #3: Hydration is too low
Low-hydration dough (under 65%) is stiff and dry. The gluten is there, but without enough water it can’t stretch thin. It’ll tear before windowpaning even if it’s well-developed.
How to fix it:
- Check the hydration of your recipe — aim for 70–75% for easier windowpaning
- If dough feels stiff and rubbery, add water next time
- Consider a bassinage: mix at lower hydration, then gradually add water
👉 Related: Sourdough hydration explained · Sourdough hydration percentage explained
Cause #4: Your flour can’t windowpane (low protein or whole grain)
Not every flour can windowpane. It’s a gluten test, and gluten depends on protein.
Flours that often won’t windowpane:
- All-purpose flour (9–11% protein)
- Any 100% whole wheat or rye
- Ancient grains (einkorn, spelt, emmer)
- Gluten-free flours — impossible by definition
Flours that windowpane easily:
- Bread flour (12%+ protein)
- High-gluten flour
- Blends with vital wheat gluten added
How to fix it:
- Use bread flour for most of the flour weight (at least 70%)
- Let whole grain dough rest overnight — bran softens and becomes more extensible
- For 100% whole wheat, just skip the test entirely
👉 Related: Best flour for sourdough beginners · Can you use all-purpose flour for sourdough
Cause #5: The dough hasn’t rested enough
Gluten gets tense during mixing and kneading — like a stretched rubber band. If you test right after working it, it’ll tear because it’s still under tension, not because it’s underdeveloped.
How to fix it:
- Let the dough rest 10–15 minutes before testing
- Or tear off a test piece and let just that piece rest for 60 seconds while you continue working
- Then try the windowpane test on the rested piece
Most “failed” windowpane tests are actually successful gluten that was just tested at the wrong moment.
The sourdough truth: you might not need to windowpane at all
Here’s what most sourdough bakers eventually learn: time and folds do the work that kneading does for yeast breads. If you’re doing 4 sets of stretch-and-folds over 2 hours, followed by 4+ hours of bulk fermentation, your gluten will reach 100% development by the time you shape.
You don’t need a windowpane right after mixing. You need:
- A cohesive, smooth dough
- Enough folds to build structure
- A proper bulk ferment where the folds can do their work
Test the windowpane just before shaping (at the end of bulk), not after mixing. That’s when it matters.
👉 Related: Stretch and fold schedule for beginners · Bulk fermentation for beginners
Better indicators than the windowpane test
- Dough pulls away from the bowl cleanly
- Smooth, satiny surface with no rough patches
- Bubbles along the sides of the bulk container
- Dome shape on top — dough is alive
- Poke test springs back slowly, halfway
- Jiggle test — dough wobbles like Jell-O when you shake the bowl
If you’ve got these signs, your gluten is fine. Don’t sweat the windowpane.
👉 Related: Sourdough poke test visual guide
FAQs
Should every sourdough dough pass the windowpane test? No. Stiff, whole grain, or long-fermented doughs often don’t windowpane perfectly. That’s fine.
If my dough tears during stretch-and-folds, is it a gluten problem? Usually it just needs more rest between folds. Wait 30–60 minutes between sets, especially for lower-hydration doughs.
Can I still bake if the windowpane test fails? Absolutely. If the dough feels cohesive and has risen properly during bulk, bake it. The windowpane test is a tool, not a pass/fail gate.
Will weak gluten ruin my bread? It can lead to spreading, dense crumb, or poor oven spring — but only if gluten is significantly underdeveloped. Borderline cases bake fine.
Should I add vital wheat gluten to help? You can. 1 tablespoon per cup of flour boosts gluten significantly. Useful for all-purpose flour or heavy whole wheat blends. Not needed for bread flour.
Still troubleshooting?
- Dough tearing during folds? → Needs more rest — try 45-minute intervals between sets
- Dough feels slack and weak? → Sourdough dough spreading not rising
- Dough tight and bouncy? → Sourdough dough shrinking back when shaping
- Full fermentation walkthrough: Fermentation guide
The windowpane test is a helpful check, not a requirement. Rest the dough, use the right flour, and trust your folds — your sourdough will turn out great even if the windowpane never quite cooperates.