{"id":730,"date":"2026-01-07T16:02:03","date_gmt":"2026-01-07T16:02:03","guid":{"rendered":"https:\/\/www.malteuropmaltingco.com\/2025\/01\/29\/decoction-mashing-the-collision-of-tradition-and-craft\/"},"modified":"2026-02-20T14:53:44","modified_gmt":"2026-02-20T14:53:44","slug":"decoction-mashing-the-collision-of-tradition-and-craft","status":"publish","type":"post","link":"https:\/\/www.malteuropmaltingco.com\/en\/news\/decoction-mashing-the-collision-of-tradition-and-craft\/","title":{"rendered":"Decoction Mashing: the collision of tradition and craft"},"content":{"rendered":"

In the world of craft brewing, where tradition often collides with innovation, decoction mashing stands out as a time-honored technique that bridges centuries of craft with modern artistry. Originating from storied German and Czech brewing practices, decoction mashing involves boiling a portion of the mash and then reincorporating it to achieve optimal enzymatic activity and flavor complexity.<\/span><\/p>\n

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This labor-intensive process, which once defined the character of classic European lagers, has both its ardent advocates and skeptics. While proponents celebrate decoction mashing\u2019s ability to produce rich, nuanced brews with enhanced malt profiles, critics point to the process\u2019s time-consuming nature and lack of necessity due to today\u2019s well-modified malts.<\/span><\/p>\n

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Yet, in an era where craft brewers seek to connect with history while pushing boundaries, decoction mashing endures as a testament to the art of brewing, offering a link to the past and a unique signature to contemporary creations.<\/span><\/p>\n

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\u201cIt’s definitely more of a labor of love style of brewing. But I’m a hardcore brewer in terms of process. Older styles of brewing and techniques, that’s just kind of what I’m drawn to.\u201d \u2013 Andy Ruhland, Bad Weather Brewing Co.<\/span><\/p>\n<\/blockquote>\n

What is Decoction Mashing?<\/span><\/h3>\n

In its simplest form, decoction mashing is multi-step mashing. In step mashing, the mash temperature is increased to various stages of rest, where varying beneficial reactions take place. Decoction mashing is step mashing in which a decoction is used to increase the temperature of the mash to a specific rest point.<\/span><\/p>\n

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A decoction is removing a portion of the main mash (typically from the thickest portion of the mash), boiling it, and then returning it to the main mash. This raises the temperature of the main mash to its next desired rest threshold.<\/span><\/p>\n

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Modern decoction mashing can take the form of a limited number of rest steps combined with a single decoction to a complex combination of multiple rest steps and multiple decoctions.<\/span><\/p>\n

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Decoction Mashing History<\/span><\/h3>\n

Though the origin of decoction mashing is somewhat muddled, it became notable because of its use by German and Czech brewers in the late 1700s. It is widely believed that the process was born out of practicality more so than for the flavors and aromas it fostered.<\/span><\/p>\n

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Brewers of the late 18th and early 19th centuries employed decoctions to reliably raise the temperature of the mash to achieve desired results, whether or not they fully understood the exact reactions that were taking place in the mash.<\/span><\/p>\n

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With experience, brewers discovered which steps achieved the best results for what they were brewing. These steps and rests might be different for lighter ales and darker ales, for instance, as brewers uncovered the nuances of steps and decoctions. These various steps led to such discoveries as improved efficiency, increased extract volume, greater attenuation, and depth of character from malts that were less modified and less consistent than those produced by modern day malting practices.<\/span><\/p>\n

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As brewing equipment advanced, malting practices honed more highly modified malts, and large scale beer production became commonplace, the use of decoction mashing diminished. Even in Germany, often credited as decoction mashing\u2019s birthplace, it has been widely replaced by the more economically advantageous direct-heat step infusion mashing or even single infusion mashing.<\/span><\/p>\n

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There are a number of breweries that still employ decoction mashing, swearing by the results, insisting that the end character of the beer can\u2019t be matched by other methods. It is still common in southern Germany and Czechia.<\/span><\/p>\n

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Triple decoction mashing was so popular in the Bavarian region of southern Germany that it was often called the Bavarian Method of brewing. And in Czechia, the European Union has issued a legal seal of quality called a PGI (protected geographical indication) for Czech beer \u2013 \u201c\u010cesk\u00e9 pivo\u201d \u2013 that can only be obtained by employing decoction mashing, amongst other qualifications.<\/span><\/p>\n

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Pilsner Urquell, the world\u2019s first pale lager or Pilsner, is still brewed at mass scale using decoction mashing. There are also many renowned craft breweries in the United States and elsewhere that believe decoction mashing is necessary to achieve the finest results for many of their beers.<\/span><\/p>\n

Copper brewing tank in old brewhouse at Pilsner Urquell Brewery, Pilsen, Czech Republic<\/figcaption><\/figure>\n
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\u201cThe benefits [of decoction] that we’ve noticed with our sensory [analysis] is just a more malty beer, but without using some specialty malt. And it has more of a depth of flavor than you would get from a step mash.\u201d \u2013 Bradley Zimmerman, Badger Hill Brewing Co.<\/span><\/p>\n<\/blockquote>\n

How to do a decoction mash<\/span><\/h3>\n

There are different ways to perform a decoction mash, but they share a couple of common goals. One is to boil a portion of the mash to break down cell walls to allow for more complete conversion of starch to sugar. The other is to raise the temperature of the mash to a specified rest temperature to favor specific enzymatic activity.<\/span><\/p>\n

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For our purposes, we\u2019ll explain a few mash schedules to give an idea of the basic process. There are, however, numerous areas in which to alter these schedules to achieve various outcomes depending on the type of beer being made and the specific ingredients being used.<\/span><\/p>\n

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Most decoction mashes typically start with a higher liquid to grist ratio than a single infusion mash. A common ratio is 1.9 to 2.2 quarts of strike water per pound of grain (4 to 4.6 liters per kilogram). This is to account for evaporation when bringing the decoction to a boil.<\/span><\/p>\n

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The volume of the decoction is typically a quarter to a third of the total volume of the mash but can be calculated with the following basic formula:<\/span><\/p>\n

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decoction volume = total mash volume \u00d7 (target temp – start temp) \/ (boil temp – start temp)<\/span><\/p>\n

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(NOTE: Total mash volume includes liquid and grain. Target temp is the rest temperature being targeted. Start temp is the temperature of the mash prior to achieving the target temp. Boil temp is the temperature for boiling adjusted to whatever elevation brewing is taking place (i.e. 212\u00b0F [100\u00b0C] at sea level, but 203\u00b0F [95\u00b0C] at 5,000 feet [1,524 meters] of elevation).<\/i><\/span><\/p>\n

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There are more specific decoction volume formulas available via software calculators and books, such as <\/span>A Handbook of Basic Brewing Calculations<\/u><\/i><\/span><\/a> published by Master Brewers Association of the Americas.<\/span><\/p>\n

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Also note that it is important to heat the decoction gradually, so as not to scald the mash or denature the enzymes too quickly. The temperature should be raised at a rate of about 2-4\u00b0F (or 1-2\u00b0C) per minute.<\/i><\/span><\/p>\n

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Traditional Triple Decoction Mash<\/span><\/h4>\n
Sample Triple Decoction Mash Schedule<\/figcaption><\/figure>\n

The basis for all other decoction mash procedures is the grand-daddy of them all, the traditional triple decoction mash. This procedure begins with mashing in at a fairly low temperature that also serves as an acid rest, a decoction that then steps up to a protein rest, another decoction that steps up to a saccharification rest, and a final decoction that steps up to mash-out temperature.<\/span><\/p>\n

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Triple Decoction Mash Schedule<\/span><\/h4>\n