Beer Info FAQ

How to Pasteurize Wood Chips for Homebrewing

Wood aging is a popular technique used in homebrewing to impart unique flavors and aromas to beer. However, using untreated wood chips can introduce unwanted bacteria and spoilage organisms into your brew. To ensure the quality and safety of your beer, it is essential to pasteurize wood chips before adding them to your brewing process. This article will guide you through the process of pasteurizing wood chips, explaining its importance and providing helpful tips for homebrewers.


Wood aging has been a traditional method of enhancing beer flavors for centuries. The porous nature of wood allows it to interact with the beer, adding complexity and depth to the final product. However, untreated wood can harbor harmful microorganisms that can spoil the beer and lead to off-flavors. Pasteurizing wood chips is a crucial step in the brewing process to eliminate these potential risks and ensure the desired flavor profile.

The Pasteurization Process

  1. Selection of Wood Chips: Choose high-quality wood chips suitable for brewing, such as oak, cherry, or maple. Avoid using wood chips treated with chemicals or varnishes, as they can contaminate the beer.

  2. Cleaning and Soaking: Thoroughly clean the wood chips by rinsing them with water to remove any dirt or debris. Then, soak the chips in water for at least 24 hours to hydrate them and remove any excess tannins.

  3. Boiling: Transfer the soaked wood chips to a large pot and cover them with water. Bring the water to a boil and maintain a rolling boil for 15-20 minutes. Boiling kills any potential bacteria or wild yeast present on the wood chips.

  4. Cooling and Drying: After boiling, remove the pot from heat and allow the wood chips to cool naturally. Once cooled, spread them out on a clean surface or baking sheet to dry completely. Ensure they are completely dry before adding them to your beer.

Benefits of Pasteurizing Wood Chips

  1. Safety: Pasteurizing wood chips eliminates harmful bacteria and wild yeast that can spoil the beer and pose health risks.

  2. Consistency: By pasteurizing wood chips, you can ensure a consistent flavor profile in your beer, as unwanted microorganisms are eliminated.

  3. Control: Pasteurization gives you control over the wood aging process, allowing you to achieve the desired flavor intensity without the risk of off-flavors.

Frequently Asked Questions

Q: Can I skip the pasteurization step and use untreated wood chips? A: It is not recommended to use untreated wood chips in homebrewing, as they can introduce unwanted bacteria and spoilage organisms into your beer.

Q: How long can pasteurized wood chips be stored? A: Once pasteurized and properly dried, wood chips can be stored in an airtight container for several months. However, it is best to use them as soon as possible for optimal flavor contribution.

Q: Can I reuse pasteurized wood chips? A: Reusing pasteurized wood chips is not recommended, as they may have already imparted most of their desired flavors to the previous batch of beer.

Q: Are there any alternatives to wood chips for wood aging in beer? A: Yes, alternatives to wood chips include wood staves, spirals, or cubes. These alternatives are often pre-treated and do not require pasteurization.


Pasteurizing wood chips is a crucial step in the homebrewing process, ensuring the safety and quality of your beer. By following the proper pasteurization techniques, you can eliminate harmful microorganisms and achieve consistent and desirable flavors in your wood-aged beers. Remember to always prioritize cleanliness and hygiene throughout the brewing process to produce the best possible brews.