13 sources cited inline of 15 listed. Your dough is not misbehaving. It is doing exactly what that temperature demands, on a schedule written for a cooler room.
Starter, bulk and cold proof when the room will not cooperate
Because fermentation runs faster when it is warmer, so a recipe timed in a cooler kitchen reaches the same stage earlier than its clock says. Work from dough temperature and from what the dough is doing rather than from elapsed time, and note that a warm loaf keeps fermenting as it cools.
Written by Abdelmounim El Moussaddar · published by TopDigitalKnowledge · 32 pages · 14 tables
What everybody says
If the dough is running away in the heat, just use less starter and keep the same timings.
What the evidence says
That changes the prefermented flour percentage, which changes the timing as well — so you have altered two things and still have no reference point. The guide’s position is that a percentage endpoint borrowed from a cooler process should not be applied mechanically to a warmer one, because the point at which a dough should leave bulk depends on the whole process, including dough temperature and the intended final proof. A warm loaf also continues fermenting as it cools, which a schedule written for a cool kitchen never had to account for. Measure the dough, not the clock.
Count the flour and water inside the starter as flour and water. Most recipes quietly do not.
The guide works one example all the way through. A 100 g starter at 100% hydration contains 50 g flour and 50 g water. With 450 g flour and 290 g water added, the totals become 500 g flour and 340 g water — so hydration is 340 ÷ 500 × 100 = 68%, salt at 10 g is 2%, and prefermented flour is 50 ÷ 500 = 10%.
Those three numbers are what let you compare one bake to the next, and to someone else’s. A recipe quoting 64% hydration while ignoring its starter is describing a different dough from the one in your bowl.
It also explains a common frustration. Adding a large amount of water late in mixing changes hydration and tends to leave poorly incorporated patches, so the fix for a stiff dough is to decide on a lower starting hydration next time rather than to correct mid-mix. Use a scraper and lightly damp hands during bulk, and only enough surface flour at shaping to prevent sticking.
An insulated box with the cooling kept separate from the dough, and measured rather than assumed.
The arrangement is simple: the dough tub on a dry support inside an insulated box, the cold pack not touching the dough container, and both air and dough temperatures monitored. Start with modest cooling and adjust from what you measure.
The warning attached to this is the useful part. Do not assume a particular number of cold packs holds a particular temperature — a baker-documented cool-box approach supports the principle, but the setup has to be calibrated in your kitchen, with your box, in your weather. A method that holds 24°C in one room will not in another.
This is why the book treats temperature as something you read rather than something you arrange. The thermometer is the tool that makes every other instruction in it transferable.
A predictable rise after feeding, bubbles through the culture, and a surface near its observed peak — with the height and elapsed time recorded.
Recording is the part that converts a vague impression into a usable reference. Once you know your starter peaks in five hours at a given temperature and feed, a six-hour peak tells you something has changed.
The float test gets a qualification rather than a dismissal: it depends on trapped gas and on handling, so it is not the sole readiness test. It can confirm what the jar already showed; it should not be the only thing you look at.
Feeding ratios are written seed : fresh flour : fresh water by weight. Equal fresh flour and water maintain a 100% hydration starter when the seed is also at 100%. A larger feed dilutes the seed more and generally takes longer to peak under otherwise similar conditions — which is the lever to reach for when you want the starter ready later rather than sooner, though exact timing still depends on temperature, flour and the starter’s condition.
It is a route rather than a rule, and the transition is where it goes wrong in hot weather.
For a same-day loaf, keep it covered and inspect frequently while the oven heats. For a refrigerated proof, move it to the fridge promptly once the bulk and shaping observations support that route — and keep in mind that a warm mass does not reach refrigerator temperature instantly. The dough keeps fermenting while it cools, sometimes for a long time, which is exactly the effect a hot-kitchen baker is trying to escape.
Use a refrigerator thermometer rather than the dial number, keep the covered basket on a clear shelf away from raw foods, and note that a household refrigerator should be held at 4°C or below for general food storage. That is a food-safety target and does not establish any particular proof duration.
Covered, hot, then uncovered — and judged on crust and crumb rather than on one number.
For the 850 g practice loaf the guide uses a covered-vessel bake around 230°C as a reasonable starting approach, preheating the oven and vessel per the vessel maker, commonly 30–45 minutes for a substantial pot. Confirm the lid, handle and any liner are rated for the temperature. Roughly 20 minutes covered, then 20–30 uncovered, adjusted for your oven.
A probe reading can support the assessment, but temperature alone does not confirm the right crust or crumb, and bread style affects what reading is useful — so a single number is not a complete doneness test.
Then wait. At least two hours on a rack for this size, longer if the centre is still warm, because slicing early makes the crumb look gummy and will send you chasing a fault that is not there. When you do cut it, photograph the whole cross-section with the loaf profile.
And read the crumb carefully. The book is explicit that its crumb interpretations are hypotheses, not a diagnostic atlas: lighting, slice position, flour and baking all affect the picture, and a single large hole proves nothing either way.
Any room warm enough that recipe timings consistently overshoot — the guide does not fix a threshold, because the variable that matters is dough temperature rather than room temperature. What it gives you is the measuring and cooling method, so the same loaf can be made across a range of conditions.
A scale and a thermometer. The cooling arrangement uses an insulated box and cold packs you likely own. Everything else is ordinary baking equipment, and the printable pages are inside the PDF. Nothing physical is included with the download.
One loaf, worked all the way through with its percentages shown, plus the logs to repeat it. It is a method book rather than a recipe collection — the point is that once you can calculate hydration and prefermented flour, other recipes become comparable to each other.
It covers feeding ratios, readiness and recording, and cites King Arthur’s create guide for building one. The focus is managing an existing starter in heat rather than the first fourteen days of establishing one.
No. The guide carries the FDA guidance directly: do not eat raw flour, starter or dough; wash hands, tools and surfaces after handling flour; keep raw flour away from ready-to-eat foods. Fermentation is not a substitute for cooking.
No. The cover is the only image in the file, and it is an illustrative image. The book makes the point that crumb photographs are unreliable comparisons anyway, since lighting, slice position and flour all change the picture — which is why its crumb section is framed as hypotheses rather than as an atlas.
Fifteen are listed and thirteen are cited inline; this page prints both. The register is mostly King Arthur Baking’s technical pages, two FDA food-safety pages, two from The Sourdough Journey and one hot-weather baking article. These are baking-industry references rather than research literature.
Almost every sourdough recipe was timed in a kitchen cooler than yours. In a warm room the same dough reaches the same point sooner, so following the clock produces a slack, over-fermented mass and a flat loaf — and the common fixes, more flour or less starter, address the wrong variable. This guide replaces the schedule with two things that travel: dough temperature and baker’s percentages. It works one loaf through completely, including the arithmetic most books skip — a 100 g starter at 100% hydration contributes 50 g flour and 50 g water, which is what makes the hydration figure come out at 68% rather than the number on the recipe. 32 pages, 14 tables, 15 references, 13 cited inline.