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homecanned green beans in jar on counter

What Causes Canning Lids to Buckle? (+ Proper Tightening)

Food Preservation, Food Preservation - Canning, Pressure Canning, Water Bath

Some of the links below are affiliate links, which means I will earn a commission at no additional cost to you, if you click through and make a purchase. Regardless, I only link to products we use on our homestead or believe in.

What causes canning lids to buckle when water bath or pressure canning food? And how can you prevent this from happening in the first place? I'm showing you how to properly tighten your canning lids to practice the safest canning methods for the best home food preservation.

A woman pulling out home canned foods from a pantry.

Knowing how to properly can food is a skill, and many tips and tricks that have been handed down from great-grandma over the years may not be the best or safest canning methods.

Thankfully, we have tested and approved canning methods to help us know how to safely and confidently can food at home to preserve the garden harvest. In this post, learn how to prevent lid buckling, how to properly tighten canning lids, know whether improperly canned food is safe to eat, and what the red flags to watch for.

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Canning supplies and jars sitting on a kitchen counter.

What causes lids to bulge or buckle when canning?

There are several reasons canning lids will bulge or buckle and even not seal during the canning process. The three main reasons are overtightening or under-tightening of the band, incorrect use of headspace, and faulty lids. For more information, see my article on The Science of Home Food Preservation.

  • Overtightening or under-tightening of the band will inhibit the oxygen process while canning. Oxygen needs to be exhausted out of the jar during the canning process for it to be safe to eat and effectively canned.
    • Overtightening can cause the lid to buckle during the canning process.
    • Under tightening can cause the band to work its way loose and cause the lid to come off altogether during the canning process.
  • Incorrect use of headspace can cause the liquid and food to push the lid off entirely because there may not be enough space in the jar to allow the oxygen to exhaust. Each canning recipe will tell you whether to use 1/4 inch, 1/2 inch, 1 inch, etc. of headspace. This will vary from recipe to recipe, so always check your approved recipe for specifications.
  • Faulty lids may cause the lids to buckle, seal improperly, or not seal at all. Ball and Kerr lids work well, as do ForJars (coupon code “Modern10”)and Denali lids (“SPENDNSAVE” discount code to get a 15% discount for every $75 order).

Pro Tip: My favorite lids, however, are Superb Lids. I get mine through Azure Standard (Coupon Code “MKN10” – $50 minimum, for first-time customers only). Superb lids are made in the USA (Ohio) with a thicker seal compound and improved lid due to the increased pounds of pressure needed to seal (greatly reducing false seals). Better yet, they're in 60 or 300 packs, so you don't go through a box in one day's worth of canning.

A headspace measuring tool measuring a jar of pears.

How do you keep canning lids from buckling?

There is a general process food goes through when being canned. This is why we have specific recommendations for canning. These recommendations ensure a safe and successful canning process. Read below for precise instructions on the proper canning process for your lids.

  1. Place food in a clean glass canning jar.
  2. Remove air bubbles and add more food if needed to maintain headspace.
  3. Wipe the rim of the jar with a clean, damp paper towel to make sure there are no leftover food or dirt particles (a cloth dipped in vinegar helps cut through any greasy foods on the rim of the jar, such as bone broth).
  4. Place the lid on the jar.
  5. Use the “Fingertip Tightening Process” (see instructions below) to correctly tighten the band over the lid and onto the jar.

How tight should lids be when canning?

You have spent so much time preparing your food, preparing your jars and lids, and are now looking forward to shelves and pantries full of preserved food. Knowing how to tighten a lid and band correctly is very important.

Can you over-tighten canning lids? What if you under-tighten your lids? It is easy to know how to avoid both of these tightening problems if you use the following process below.

A woman tightening the lid onto a jar of home canned pears.

Fingertip Tightening Process

This fingertip-tightening process will help ensure you don't over or under-tighten your lids. You will successfully can more jars using this method as well.

  1. Using only your thumb, index and middle fingers (three fingers total), equally hold your band.
  2. Place the band over the lid and onto the jar.
  3. Twist just until you meet some resistance.
  4. Then simply twist 1/4 turn more.

If you find this confusing, refer to the video tutorial accompanying this blog post.

homecanned green beans in jar on counter

If buckling happens, is the food still safe to eat?

In most cases, the lid, despite being buckled, will still seal on the jar. The food is still safe to eat; however, don't store it on the shelf.

To safely be able to eat this jar of food, either freeze it or put it in the fridge. Be sure to use it within a few days if you put it in the refrigerator.

Now that you know how to properly tighten your canning lids, you should be able to avoid and prevent unnecessary lid buckling.

Everything Worth Preserving Book Cover.

Everything Worth Preserving

Looking for more fermented recipes? Discover the nine home food preservation methods to safely store delicious food for year-round eating with all of my step-by-step tutorials, recipes, and easy-to-use charts.

Learn everything you need to know about cold storage (aka freezer), water bath/steam canning, pressure canning, dehydrating, fermenting, freeze-drying, root cellar, infusion, and salt/curing in the new book, Everything Worth Preserving.

Jars of home canned tomato sauce on counter with ripe paste tomatoes and wicker basket

More Articles You May Enjoy

  • What You Don’t Know About the USDA & Canning Safety Rules
  • Tips for Home Food Preservation – Seasonal Preserving Each Month
  • Home Food Preservation- Preserving Plan for a Year’s Worth of Food
  • 9 Ways to Preserve Food at Home
  • Botulism Prevention and Preservation Safety Tips
  • Does Pressure Canning Ruin Bone Broth
  • How to Store Home Canned Food Safely – Jar Stacking & Canning Rings
  • 129+ Best Canning Recipes to Put Up This Year
  • How to Preserve Meat, Eggs, & Dairy
  • How Do You Know if a Canning Recipe is Safe
  • How to Pick the Best Preserving Methods
  • How to Convert Recipes for Canning + Safety Tips
  • Planning and Preserving Q&A with Melissa

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Melissa Norris

Melissa K. Norris inspires people's faith and pioneer roots with her books, podcast, and blog. Melissa lives with her husband and two children in their own little house in the big woods in the foothills of the North Cascade Mountains. When she's not wrangling chickens and cattle, you can find her stuffing Mason jars with homegrown food and playing with flour and sugar in the kitchen.

Read more about Melissa

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Comments:

  1. Lyn Instefjord

    October 26, 2022 at 8:41 am

    Not sure what buckling is… I did have some tomatoes leak in the water before sealing, but they did seal. Will those be okay?

    Reply
    • April

      October 26, 2022 at 1:17 pm

      Google a pic.

      Reply
    • Mary Ellen

      October 26, 2022 at 2:23 pm

      Lyn – buckling is when the lid bends, creases, and…well…buckles. The metal of the lid fails to stand up to the pressures of the canning process.
      If you use Ball/Kerr lids, you have probably never seen a buckled lid. I bought some unbranded lids on the internet out of desperation during the pandemic, and the lids buckled when I water bath canned with them. I now only use branded lids or lids that Melissa recommends. I googled “buckled canning lid photos” and got some pretty good examples of what this looks like. Some of the buckled lids were Ball/Kerr, so I suspect that they may have been over-tightened as Melissa said. Is it the jar? Is it the lid? Is it the technique? Dunno…but if you follow Melissa’s recommendations you should not ever have to deal with BUCKLED LIDS! 🙂

      Reply
  2. George Craig

    October 26, 2022 at 2:30 pm

    I checked out the website for Azure you mentioned in your article and ordered Superb canning lids. Even with shipping charges the price is better than I can find for Kerr or Ball. The article mentioned a coupon code MKN10. I could not find any way to use it on the website. What is the purpose of that code?

    Reply
  3. Nancy

    5 months ago

    I did not find a link to the video you referred to about tightening the lids on the jars before putting them in the canner.

    Reply
    • I couldn’t find the video either

      5 months ago

      Where is the link for the video you mentioned?

      Reply
  4. Debby Jordan

    October 27, 2022 at 2:02 am

    Can you print this out

    Reply
  5. P. Visser

    October 27, 2022 at 11:59 am

    Can those Superb canning lids be re-used?

    Reply

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