Double Hydration Sourdough Method, Demystified

Double hydration is a professional bakery technique that's surprisingly easy to do at home. It's used to produce strong, extensible doughs — the kind that handle 80%+ hydration without falling apart.

The principle

Instead of mixing all the water in at once, you withhold a portion (usually 5–10%) until the dough has formed a strong base. Then you mix in the reserved water, called the bassinage, after gluten has started to develop.

The dough builds structure first, then absorbs the additional water without becoming a slack mess.

Why it works

When you mix flour and water, gluten formation begins at moderate hydration (around 65%). Above 80%, the gluten network is harder to develop because the proteins are too dispersed.

Double hydration solves this:

• First mix at 70% creates a strong, tight dough
• After autolyse + folds, that gluten can absorb another 10% water without losing structure

The end dough is at 80% hydration but handles like 75%.

Step by step

1. Initial mix

For a 500g flour recipe at final 80% hydration:

• 500g flour
• 350g water (70%)
• (Hold back 50g water)

Mix until just combined. No starter, no salt yet.

2. Autolyse 1 hour

Cover and rest. The flour fully hydrates. Gluten begins developing.

3. Add starter

Mix in 100g active starter. Use the rubaud method (squish through your fingers) until incorporated.

4. Add salt and reserved water

Sprinkle 10g salt over the dough. Pour in the reserved 50g water. Pinch and squeeze through your fingers — the salt and water will eventually disappear into the dough.

This step takes about 5 minutes. The dough will look broken at first, then suddenly comes back together.

5. Bulk and fold

Standard bulk fermentation with 4 sets of folds.

What it accomplishes

• Higher final hydration with same handleability
• Stronger oven spring
• More open crumb
• Easier shaping at high hydration
• Less sticking to hands and surfaces

When to use it

• Whenever you want hydration above 78%
• For high-protein bread flour
• For lower-protein flours that struggle with high hydration
• For Tartine-style or country loaves with open crumb goals

When not to bother

• Hydration below 75% — single mix works fine
• Sandwich loaves and enriched doughs — different goals
• Whole wheat or rye-heavy doughs — water absorption is high but gluten is different

The bassinage as a flavor lever

Some bakers add other liquids in the bassinage:

• Cold water (slows fermentation)
• Whey from yogurt (more flavor and acidity)
• A few grams of olive oil (richer crumb)

The dough has formed enough structure to absorb these without disrupting fermentation.

Common mistakes

Adding too much water at the bassinage — sticking to less than 10% of total water gives consistent results. More than that risks losing the structure.

Bassinage too early — adding water before gluten has formed defeats the purpose. Wait until after autolyse and starter incorporation.

Bassinage too aggressively — squeeze and pinch, don't beat. You're working water in, not building structure.

How to know it worked

After bassinage, the dough should:

• Look slick but not soupy
• Pull back when you stretch it
• Hold a window pane after the second fold
• Have enough strength to release cleanly from the bowl

A test bake

Try the same recipe two ways: once with all water mixed at start, once with double hydration. Compare:

• How easy was shaping?
• How tall was the oven spring?
• How open was the crumb?

For most bakers, double hydration is noticeably better. For some, the simpler method is good enough. Try it once and decide.

The professional context

Double hydration is standard at high-end bakeries because it scales. Professional mixers can incorporate water gradually. At home, you're doing the same thing by hand — and the results are real.

Once you've used double hydration on a few bakes, you'll find it as easy as a standard mix and the upgrade in dough quality is hard to ignore.