Sourdough Crust Too Thick or Too Thin: A Diagnosis Guide for Both Problems

Here’s a claim that ruffles feathers in every sourdough forum I’ve ever lurked in: a thick crust is almost never a “too hot oven” problem, and a thin, floppy crust is almost never a “not enough steam” problem. Most of the time it’s the opposite of whatever everyone assumes. I learned this the hard way after pulling a loaf from my Dutch oven, setting it triumphantly on the cooling rack, doing a ridiculous little happy-dance around my kitchen — and then knocking the whole thing straight off the rack. It hit my tile floor with a thud that sounded uncomfortably like a bowling ball landing, bounced twice, and skidded clean under the stove. “Thick” doesn’t even cover it. That crust was closer to armor plating. So if you’ve ever wrestled with a sourdough crust that’s either too thick or too thin, stick around — the explanation might surprise you, and yes, my floor survived.

Crust trouble ranks near the top of my list of infuriating sourdough moments, mostly because it shows up right at the finish line. By that point you’ve already sat through a full day of bulk fermentation, babied your folds, shaped the dough with a steady hand — and then the oven hands you a loaf that either cracks like glass under a knife or sags like damp cardboard the second you glance at it. Neither outcome feels good. The reassuring part is that both are entirely solvable once you trace the actual cause, and that’s the whole point of what follows.

How a Cheap Thermometer Cleared My Dutch Oven of All Blame

A helmet-thick crust usually has nothing to do with your Dutch oven at all — the real culprit is the actual air temperature inside your oven, which can be shockingly different from the number on the dial. I fiddled with steam levels and scoring patterns for months without realizing my oven was quietly running 50°F cooler than I’d set it, effectively poaching my crust instead of blasting it with the heat needed to sear.

Where this earns its keep

• Gives an honest enough readout to expose genuine temperature drift — mine revealed my oven was falling well short of the 500°F setting, which suddenly made sense of every crust issue I’d been having.
• Sits securely on the oven rack instead of swaying around, so once you’ve preheated for about 10 minutes, you can actually trust the number instead of watching it drift.
• Has a dial big enough to check right through the Dutch oven lid, meaning you’re not cracking it open mid-bake and letting all your hard-earned steam vanish.

Where it falls short

• It stays silent on hot spots elsewhere in the oven — it only reports on the exact spot where it’s clipped, so uneven browning can still sneak in even when your overall temp checks out.
• That hanging clip isn’t the sturdiest — get careless with placement and it can slide, and suddenly you’re reading the Dutch oven’s own heat rather than the true air temperature around it.

I almost returned it after my first bake because the temperature reading seemed wrong—until I had my oven professionally calibrated and realized the thermometer was right and my oven dial was a liar. Rubbermaid Commercial Stainless Steel Oven Thermometer

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