Micro-Climatic Draft in Kitchen Identified as Primary Variable in Unforeseen Boule Collapse

"Before anyone says the word underproofed, I want four millimetres on the record," said Dorian Iverson, tapping a steel rule against the gap beneath the back door, where a thin seam of daylight had been doing quiet work all winter.

The boule in question sat between them on the bench: 78.0% hydration, mixed to a dough temperature of 25.5°C, bulked four hours twenty at 24°C, retarded overnight, scored with a curved blade and loaded with a confident grigne. It reached an internal 96°C (204°F) at fifty-one minutes, carried a proud ear out of the oven, and folded flat across the top rack within twenty minutes of cooling. The bloom opened, then kept opening in the wrong direction.

Underfermented bulk was the first accusation, and the third-generation baker behind the deck rejected it with the weariness of a man who has been right about this before. The dough had domed, jiggled, and held a clean windowpane at the end of bulk. He had the photographs. He has photographs of everything.

Before the draft story was accepted, the mill invoice was pulled: lot 4417 of a 12.4% protein straight-grade white, two sacks, delivered on the same run as the previous Tuesday's miche, which had come out of the same oven with a textbook ear and no complaints from anyone. Flour exonerated by the ledger. Water out, same scale, same liter. Levain feeding unchanged at 1:5:5 on a twelve-hour cycle. That left the room, and the room was happy to be left.

Harold Nix, who has logged oven-spring height at crumb level for six years without anyone asking him to, retrained his sheet to measure draught velocity at four heights: 0.4 metres per second at the skirting, 1.1 at bench height, and 2.6 whenever the extractor fan cycled on. The gap under the back door measures four millimetres and widens to nearly seven under load. Nix now considers this civic infrastructure.

Iverson issued a ruling the same afternoon, filing the incident under Class II intermittent kitchen draught, ankle-height, with an aggravating note about the extractor fan's cycle interval. Weatherstripping was applied that evening. The next bake came out clean.

It also ran a bulk forty minutes longer and came from a levain fed two hours earlier than schedule, which means the bakery now has two variables changed at once and no way to tell which one carried the loaf. The draft has been promoted from excuse to documented cause; the hour of doubt in the bulk has gone unlogged, because doubt does not appear on an invoice.

The corrective action on file is nine metres of self-adhesive foam tape. Laleh's Purchase Order records it at £4.20, against a boule whose flour and levain cost less than half that. It is the only intervention this bake has produced a receipt for, and it is the one everyone now cites.

Two readers have already written to say they will not accept the ruling until the crumb is shown.