Malting and Kilning
Malting is controlled germination of barley, stopped by heat before the growing plant uses up its starch. Kilning is the drying stage, and peat can be burned during it: the Scotch Whisky Technical File describes peat being used to varying degrees alongside more modern fuels. Together, these stages explain the connection between barley, enzymes, kiln smoke and the distinctive pagoda-shaped chimneys of many Scotch whisky distilleries. [1][2]
Start here if you are new
- Read how malting works first. It explains why barley is encouraged to germinate, what happens inside the grain and why the process is stopped rather than allowed to continue.
- Follow with how peat is cut and burned for malting. It puts peat in its production setting, as a fuel used during the drying of malted barley, rather than treating smoke as a separate subject.
The other two guides approach the same process through its surroundings. Floor maltings explain the traditional working arrangement, while the pagoda article connects a familiar feature of distillery architecture with the movement of hot air and smoke through barley. Choose either next according to whether your interest is the work inside the maltings or the structure above the kiln.
From barley to dried malt
The useful starting distinction is between encouraging growth and stopping it. The Maltsters’ Association of Great Britain describes malting as controlled germination: after hydration, the embryo causes enzymes to be produced that break down cell walls in the endosperm, the grain’s starch-containing interior. Heat then stops germination before the young plant uses up the starch. [2]
That sequence gives the subject its shape. Water begins the process; germination brings changes inside the grain; drying brings that growth to a halt. In the traditional floor-malting process described by the Scotch Whisky Technical File, barley was steeped in tanks for two to three days before being spread across the malting-house floor to germinate, then dried in a kiln. [1]
| Stage | What the supplied sources describe | Guide to read |
|---|---|---|
| Steeping | Traditionally, barley stood in tanks of water for two to three days before floor germination. [1] | How Malting Works |
| Germination | Hydration prompts enzyme production and the breakdown of cell walls inside the grain. [2] | How Malting Works |
| Floor working | In traditional floor maltings, grain is turned by shovel on a germination floor. [2] | Floor Maltings: The Distilleries That Still Do It |
| Kilning | Heat stops germination; peat can be used among the fuels for drying malted barley. [1][2] | How Peat Is Cut and Burned for Malting |
The traditional steeping time belongs to that description of floor malting. It is not presented here as a timetable for every maltings. Likewise, the shovel and germination floor describe one working method, not a requirement that all barley used for Scotch must be malted that way. The Technical File says most distilleries buy malt from dedicated malting companies. [1]
The main guides to malting and kilning
How malting works
Read How Malting Works for the connection between the growing grain and the enzymes needed later in production. It is the foundation article for understanding why malting matters, rather than simply recognising it as an early stage.
For Scotch whisky, that connection has a specific legal context. The Technical File states that Scotch must be made from water and malted barley, to which only whole grains of other cereals may be added, and that conversion into a fermentable substrate must take place at the distillery using endogenous enzyme systems. These are the enzymes arising within the raw materials, rather than added enzymes. [1]
The Technical File explicitly says that the definition prohibits added enzymes and requires malted barley. Malting supplies the barley with enzymes that later turn starch into sugar; the germination process is therefore connected to what the distillery needs from its mash, not merely to the appearance of the grain. [1][2]
Keep the category in view when reading the article. The Technical File describes malt Scotch as being made from malted barley, water and yeast, with malting as the first production stage. Its broader Scotch definition also allows whole grains of other cereals. Those statements describe different levels of the definition and should not be collapsed into one rule for every whisky. [1]
Floor maltings
Read Floor Maltings: The Distilleries That Still Do It to understand the traditional arrangement of steeping tanks, germination floors and kilns. It is the place to explore the method behind the phrase “floor maltings”, rather than assuming that the term describes all malt production.
The physical work is central to the description. The Maltsters’ Association of Great Britain describes grain being turned by shovel on the germination floor, while the Technical File follows the barley from its water tanks to the floor and then to the kiln. These accounts help connect the working spaces with the sequence of malting. [1][2]
The Technical File says that some distilleries still use this traditional process, but that most buy malt from dedicated malting companies able to produce traditional malted barley on a larger scale. Buying malt and carrying out malting at the distillery are therefore distinct arrangements within the production account. [1]
A useful question to carry into the guide is: which part of the process is being described? A reference to barley germinating on a floor tells you about the malting method; a reference to malt being bought from a dedicated company tells you about its supply. Neither description, by itself, is a tasting assessment.
Peat cutting and burning
Read How Peat Is Cut and Burned for Malting for peat’s place in the drying process and the context behind the industry’s extraction figures. This guide keeps the fuel, the kiln and the peatland evidence together.
The Technical File describes peat as turf cut from Scotland’s moors and used to varying degrees to fire malt kilns alongside more modern fuels. It also records its historical use both for firing stills and for drying barley. The distinction matters when reading older accounts: a reference to peat as a distillery fuel does not necessarily describe only the malt kiln. [1]
The scale figures need their qualifications attached. Guidance published in 2026 by the Scotch Whisky Association, SRUC and SEFARI Gateway puts whisky’s peat use at roughly 300 hectares from which about 8,000 tonnes are harvested annually. The guidance calls this the best possible approximation because the moisture content of peat varies. [3]
That same guidance gives Scotland’s total peatland area as about 1.8 million hectares and describes 80%, about 1.44 million hectares, as degraded. Those are national peatland figures, not a measurement of degradation attributed to whisky. Read them as context alongside the industry extraction estimate, rather than treating the figures as interchangeable measures. [3]
Pagoda roofs and Charles Doig
Read Why Do Scottish Distilleries Have Pagoda Roofs? Charles Doig's Story to connect the familiar roof shape with the kiln beneath it. The useful starting point is its working purpose: drawing hot air and smoke through the barley.
The Scotch Whisky Technical File identifies the malt kiln by its distinctive pagoda-shaped chimney, a feature it describes as typical of many malt Scotch distilleries. Its account follows smoke upwards through a wire-mesh floor to dry the barley. The chimney therefore belongs to the drying arrangement, not simply to an architectural description of the site. [1]
Dave Broom’s contribution to The Oxford Companion to Spirits and Cocktails describes Doig’s ventilators as drawing hot air and smoke through the bed of barley. That gives a practical route into the article: begin with what the ventilator was intended to do, then read the account of the person associated with it. [4]
For this hub, the supported connection is between the kiln, the barley bed and the movement of air and smoke. The linked article is the dedicated destination for Charles Doig’s story; a familiar name or striking silhouette should not substitute for explaining the feature’s function.
How to read malting claims carefully
Malting brings together several kinds of statement that answer different questions. A production definition explains what Scotch must be made from and how conversion must happen. A maltster’s account explains germination. An architectural account explains a ventilator. Keeping those purposes separate makes the subject easier to follow without asking any one source to establish more than it actually says.
The distinction is especially useful with traditional equipment. The Technical File describes both floor malting and the purchase of malt from specialist companies. Its account supports a comparison of working arrangements, but it does not turn the choice between them into a ranking of whisky quality. Read descriptions of the process for what they establish about production. [1]
Peat figures require a different kind of care: check the unit, the area being discussed and the qualification attached to the estimate. Tonnes harvested annually, hectares used for extraction and hectares of degraded peatland are different measures. The 2026 guidance supplies all three kinds of information, but they do not answer the same question. [3]
Sources
- Scotch Whisky Association, Scotch Whisky Technical File, edition and year not supplied in the verified record.
- Maltsters’ Association of Great Britain, account of malting and traditional floor maltings, document title, edition and year not supplied in the verified record.
- Scotch Whisky Association, SRUC and SEFARI Gateway, industry guidance on peat, 2026; full document title not supplied in the verified record.
- The Oxford Companion to Spirits and Cocktails, contribution by Dave Broom on Doig’s ventilators; edition and year not supplied in the verified record.
This hub was prepared as desk research from the editor-supplied verified record, without independent document inspection.
Last checked: November 2026, against the supplied extracts only; the underlying documents were not independently checked.