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8 in. x 48 in. Concrete Form Tube

  • Makes pouring concrete footings and posts easy
  • Can be used for foundations, round columns and piers
  • Affordable time-saver for a professional finish
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Product Details

The SAKRETE 8 in. x 48 in. Form Tube is designed for one-time applications to reduce the cost of pouring footings, round columns and piers. Pour concrete directly into the tube for a neat and easy form. This product is a cylindrical cardboard concrete form used for posts and pillars in above- or below-grade applications.
  • Single-use form is used when pouring concrete footings, columns, deck supports, fence posts and piers
  • Designed to allow the concrete to cure for 24 hours before stripping
  • Saves time and creates professional-looking finish
  • Easy to cut, place and secure
  • Moisture resistant to ensure weather or ground conditions will not affect your pour
  • Note: product availability may vary by store
  • Number of concrete bags required:


  • Return Policy

Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

78Questions
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Q:How much weight would a 8? x 48? sleeve support?
by|Sep 10, 2022
2 Answers
Answer This Question

A:  I assume your question refers to an application for which it was not intended, i.e. the sleeve being a post ... no concrete used. If that's the case, and a generous portion of the sleeve is exposed, I would say that it couldn't support much for very long because these tubes are wildly irregular in shape and construction and deteriorate when exposed to the weather. For example. ... if I placed a 50-lb disc across the top of one of these tubes, and the tube stood unsupported, in a matter of weeks if not days, I would expect there to be sufficient asymmetric loading on the sidewalls to cause the load to topple.

by|Sep 13, 2022

    A:  We do not have any information to how much weight a concrete form tube would support

    by|Sep 12, 2022
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      Q:Can you tape or attach two Sonotubes together to create a form? For instance if I have an 18" piece and 12" piece left over, can I join these together instead of purchasing a new tube?
      by|Jul 20, 2022
      3 Answers
      Answer This Question

      A:  It's difficult to say if this would be a viable way of creating one form tube for the purpose of pouring concrete into. It would likely be best to use one tube at the desired length for pouring concrete.

      by|Jul 20, 2022

        A:  Yes, if the tape is waterproof. Else, the joint is going to break as soon as it gets wet.

        by|Jul 25, 2022

          A:  If Being used in ground yes. If your using it above grade then no. 

          by|Jul 22, 2022
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            Q:How many bag for an 8" x 48" tube with a 4x4 in it?
            by|Jul 13, 2022
            2 Answers
            Answer This Question

            A:  Here's the theoretical answer: One 60-lb bag of concrete mix will fill a volume of 0.45 cubic feet One 80-lb bag of concrete mix will fill a volume of 0.60 cubic feet The volume of an 8" diam x 4 ft long tube is 1.39 cubic feet A 4x4" is actually 3.5"x3.5". If the 4x4 extends the full length of the tube, its volume will occupy 0.34 cubic feet of the tube's 1.39 cubic feet; thus, you only need enough concrete mix to fill the remaining 1.05 cubic feet. And that can be done 140 lbs of concrete mix [in this case one 60-lb bag plus one 80-lb bag]. And that can be done with

            by|Nov 28, 2022
              4 found this answer helpful

              A:  To pour an 8" x 48" form tube including the 4 x 4 post will take approximately 3/80lbs. bags of concrete mix.

              by|Dec 10, 2022
                1 found this answer helpful
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                Q:what if I hit solid rock 32" deep for a 12" tube?
                by|Jul 2, 2022
                1 Answer
                Answer This Question

                A:  We are not aware of depth required for your project. With that said. The Form Tubes can be cut to a specific length.

                by|Jul 4, 2022
                  Showing 1-4 of 78
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                  Customer Reviews

                  4.7 out of 5
                  (295)
                  • 4.7
                    out of 295 reviews
                  • 96%recommend this product
                  Filter by:
                  Showing 1-10 of 295 reviews
                  Awesome product! Used for cat post housing & very easy to cut with razor knife!
                  Awesome product! Used for cat post housing & very easy to cut with razor knife!
                  by
                  • Verified Purchase
                  • Recommended
                  10 found this review helpful
                  diy project
                  Needed to make a smoke stack for my sons train bed. This worked out great for the diy project.
                  by
                    • Recommended
                    5 found this review helpful
                    Ideal Form Tube For Setting 4x4 Posts
                    This form tube is easy to use and helps to simplify the process of setting concrete for posts or columns. The manufacturer provides printed instructions on the outside of the tube form. Most important is that this form tube which is made of treated cardboard must be completely dry prior to concrete being poured into it for the tube form to maintain maximum strength and integrity. The manufacturer also specifies the amount of concrete mix required per foot on the outside of the form tube to fill the length of the form tube. The diameter of the form tube is +/- 0.5 inch to make it cheaper and easier to ship several form tubes by nesting them inside of each other. I used three 80 pound bags of concrete mix to fill all of the 48" length of this 8" diameter tube form and had some concrete left over. It is always better to have some concrete left over then it is to not have enough concrete because concrete must be mixed properly and poured all at once for all of the concrete to bond correctly as one solid mass before the concrete sets. The 8" diameter of this form tube is an ideal size for setting 4x4 posts since the Strong Tie post bases recommend 2" of concrete on all sides of their bases. 8" diameter is also just large enough to be able to use a spade shovel to compact the concrete as it is poured into the tube form.
                    by
                    • Recommended
                    43 found this review helpful
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                    • Verified Purchase
                    by
                    • Verified Purchase
                    Works great for postholes; our soil is composed of small...
                    Works great for postholes; our soil is composed of small and large rocks, some dirt, and packed like concrete.!
                    by
                    • Verified Purchase
                    Rating provided by a verified purchaser...
                    Rating provided by a verified purchaser
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                    • Verified Purchase
                    Rating provided by a verified purchaser...
                    Rating provided by a verified purchaser
                    by
                    • Verified Purchase
                    easy to use and prevent any undo concrete to get...
                    easy to use and prevent any undo concrete to get onto unwanted areas.
                    by
                    • Verified Purchase
                    For more then pouring concrete.
                    I used this tube as a form for wire mesh that I put inside 12" tubes as reinforcement. I have used them in the past as concrete forms and they have worked well. I will keep this one around and I am sure I will end up using it in the future.
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                    • Verified Purchase
                    • Recommended
                    Showing 1-10 of 295 reviews

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