You've noticed wine dripping from your barrel, a dark wet patch on the wood, or a puddle forming under the stand. Before you do anything else, stay calm. Most barrel leaks are straightforward to fix, and many will resolve on their own with the right intervention. Here's how to diagnose exactly what's happening and stop it.
Step 1: Find the source
Don't assume you know where the leak is coming from. Wine can run along the outside of the barrel and pool in a misleading spot. Dry the outside of the barrel completely with a cloth, then watch closely for a minute to see where the wine is actually seeping from.
The most common sources are:
- The bung: the most frequent culprit, and the easiest fix.
- The tap or spigot: if your barrel has one, the seal around it can fail.
- Between staves: a seam leak, often seen in newer or recently dried-out barrels.
- Around the hoops: a hoop that has loosened can allow staves to separate slightly.
- A crack in a stave: less common, but more serious.
Leaking from the bung: the most common cause
If the leak is coming from or around the bung, the fix is usually simple:
- Remove the bung completely.
- Dry the bung hole thoroughly with a clean cloth.
- Inspect the bung. If it's cracked, dried out, or visibly damaged, replace it.
- If the bung looks fine, try re-seating it firmly. Many 'leaks' are just a bung that isn't fully seated.
- If it continues to leak after re-seating, wrap the bung with a single layer of food-grade silicon tape or food-safe plumber's tape before re-inserting. This creates a slightly wider seal.
Contact us for a replacement bung if yours is damaged. Using the wrong size or material can introduce off-flavours.
Leaking from between the staves: the dry barrel fix
This type of leak is especially common in barrels that are new or that have been stored empty or in dry conditions. Oak staves shrink when they dry out, creating small gaps between them. The fix is to swell the wood back up by getting moisture back into it.
For a small seam leak:
- Do not empty the barrel. Keep it as full as possible. The weight and moisture of the wine itself is your best tool.
- If the leak is minor, simply top the barrel up to the bung hole and keep it full. In most cases the staves will swell within 12 to 48 hours and the leak will stop.
- Position the leaking seam facing upward if possible. This keeps the wine in contact with the gap and encourages swelling.
- If it hasn't sealed after 48 hours of being kept full, contact us.
For a barrel stored empty that is now leaking:
- Fill the barrel completely with cold water.
- Leave for 24 to 48 hours, checking regularly and topping up as the wood swells and absorbs water.
- Once the water leak has stopped, drain the barrel fully and fill with your fortified wine.
Do not use hot water. Hot water can force resinous compounds out of new oak that will taint your wine.
If the leak has got you thinking about evaporation more broadly, our guide to the angel's share explains what's normal to lose and when to be concerned. And if your barrel has been sitting low for a while alongside the leak, our post on what to do if you haven't topped up in months walks through how to get things back on track.
Leaking from the tap or spigot
If your barrel has a tap and it's leaking from the fitting (not from the tap itself when open), the seal around the tap may need replacing. This typically requires emptying the barrel or drawing down the wine level below the tap before you can work on it safely. Contact us for guidance on the right seal type for your barrel. Using the wrong fitting material can affect your wine.
Loose or shifted hoops
The metal hoops that hold the barrel staves together can shift slightly in transit or over time, particularly if the barrel has dried out. A loose hoop allows the staves to flex and separate. If you can see that a hoop has moved from its original position, or if it moves when you push it, it needs to be tapped back into place.
This is a job for a rubber mallet, not a metal hammer. Work around the hoop gradually, tapping evenly to drive it back toward the belly of the barrel. If you're not confident doing this yourself, contact us. Forcing a hoop incorrectly can crack a stave.
A crack in a stave: when to call for help
A visibly cracked stave is the most serious type of leak and not a home repair job. If you can see a crack in the wood itself (not just a seam gap), contact us immediately. Continuing to use a barrel with a cracked stave risks further splitting, a sudden larger leak, and potential contamination of your wine.
After you've fixed the leak
Once the leak is resolved, take the opportunity to:
- Top the barrel back up to the bung hole with the appropriate topping wine. If you're unsure which wine to use, our guide to choosing the right topping wine covers the full range.
- Check your SO2 levels. A recent leak and any associated stress on the barrel is a good reminder to ensure your sulphur protection is current. Our guide to SO2 and your home barrel explains what to check and how much to add.
- Make a note of the date and the fix for your barrel records.
Frequently asked questions
My barrel leaks a little when I first fill it — is that normal?
Yes, for a new or recently emptied barrel, a small amount of weeping when first filled is completely normal. The staves are swelling back up. Keep it full and it should seal within a day or two.
I've tried topping up and the stave leak isn't sealing — what now?
If a stave leak hasn't resolved after 48 hours of keeping the barrel full, contact us. There may be an issue with the coopering that requires attention, or we may be able to advise on a food-safe sealant for external use in specific cases.
Can I use wax or candle wax to seal a leaking stave?
We'd advise against it without guidance. Some sealants are safe for external use on oak barrels; others can taint wine or create further problems. Contact us before applying anything to the outside of your barrel.
My barrel was stored empty and is leaking badly when I refilled it — help
This is very common. The staves have dried and shrunk significantly. Empty it, fill with cold water, wait 24 to 48 hours for the wood to swell, drain, then refill with wine. If it's still leaking after the water soak, contact us. The barrel may need professional attention before it's ready for wine.
