Beer Info FAQ

What Does 'Capping' Someone Mean in Homebrewing?

In the world of homebrewing, the term 'capping' refers to the process of sealing bottles after fermentation to create carbonation in the beer. Capping is a crucial step in the brewing process as it ensures that the beer remains carbonated and maintains its freshness over time. This article will delve into the various aspects of capping in homebrewing, including its significance, methods used, and the impact it has on the final product.

The Significance of Capping in Homebrewing

Capping plays a vital role in the fermentation process of homebrewed beer. During fermentation, yeast consumes the sugars present in the beer wort and produces carbon dioxide as a byproduct. This carbon dioxide needs to be trapped within the bottle to create the desired level of carbonation. Capping effectively seals the bottle, preventing the escape of carbon dioxide and allowing it to dissolve into the beer, resulting in the characteristic bubbles and effervescence.

Methods of Capping

There are several methods of capping used in homebrewing, each with its own advantages and considerations. The two primary methods are:

  1. Crown Capping: Crown capping is the most common method used by homebrewers. It involves using a crown cap, which is a metal cap with a plastic seal, and a capping tool to secure the cap onto the bottle. This method provides a reliable and airtight seal, ensuring proper carbonation. Crown caps are readily available and can be reused multiple times.

  2. Flip-Top Capping: Flip-top capping, also known as Grolsch-style capping, utilizes a hinged metal clamp and a rubber gasket to seal the bottle. This method offers convenience as the bottles can be easily opened and resealed. However, it is important to ensure that the rubber gasket is in good condition to maintain an airtight seal.

Impact on the Final Product

The capping process has a direct impact on the quality and longevity of the homebrewed beer. A properly sealed cap prevents oxygen from entering the bottle, which can lead to oxidation and off-flavors in the beer. It also helps maintain the desired level of carbonation, ensuring a pleasant mouthfeel and effervescence. Improper capping, such as loose caps or damaged seals, can result in flat beer or even potential contamination.


Capping is an essential step in the homebrewing process that ensures the carbonation and freshness of the beer. Whether using crown caps or flip-top caps, the goal is to create an airtight seal that traps carbon dioxide within the bottle. Proper capping techniques contribute to the overall quality and enjoyment of the final product.

Frequently Asked Questions

Q: Can I reuse crown caps for capping my homebrewed beer? A: Yes, crown caps can be reused multiple times as long as they are in good condition and properly sanitized before each use.

Q: How tight should I cap the bottles? A: It is important to cap the bottles securely, but avoid over-tightening as it may damage the cap or the bottle. A firm and snug fit is sufficient.

Q: Can I use other types of caps for homebrewing? A: While crown caps and flip-top caps are the most commonly used, there are other options available, such as oxygen-absorbing caps or cork closures. However, it is essential to ensure that the chosen caps are suitable for the intended purpose and provide an airtight seal.

Q: How long should I wait after capping before opening a bottle of homebrewed beer? A: The time required for proper carbonation varies depending on the beer style and fermentation conditions. It is generally recommended to wait at least two weeks after capping before opening a bottle to allow sufficient carbonation to develop.

Q: Can I use capping methods other than crown capping or flip-top capping? A: While crown capping and flip-top capping are the most commonly used methods, there are alternative options available, such as using a counter-pressure filler or kegging the beer. These methods are more advanced and may require additional equipment.

Remember, proper capping techniques are crucial for maintaining the quality and carbonation of your homebrewed beer.