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How to Use Builders Tube®

For your DIY projects 

The easy-to handle Sonotube® Builder’s Tube® concrete form is just the right tool for professionally forming round concrete supports for dozens of projects around the home.

Estimate your needs

The Sonotube Builder’s Tube concrete form requires no assembly. They are ready to use the moment they are needed. The only preparation you may need is to cut the easy-to-handle lengths to fit the exact size of the project. Consult the following chart to estimate the amount of concrete you will need.

Sonotube Builder's Tube concrete form diameter 6" 8" 10" 12"
Cubic feet of concrete per foot of height 0.20 0.35 0.55 0.80
(80 lb.) Bags of concrete mix per foot of height 1/3 3/5 1 1.33
(60 lb.) Bags of concrete mix per foot of height 1/2 4/5 1.25 2

Easy steps for professional results

Place: Dig a hole to the desired depth. Place the tube in the hole, filling around the outside to secure. If the tube extends more than 2 feet above the ground line, provide additional support with a collar or wooden frame and side braces.

Fill: Be sure the Sonotube® Builder’s Tube® concrete form is dry before filling it with concrete. Sonotube Builder’s Tube concrete forms are single-use forms. It is recommended that you erect all the tubes for your job in advance in order to pour all at once and to save time. This reduces total construction time and lets you enjoy your handiwork more quickly.

Caution: Do not use a mechanical vibration technique when placing concrete in the Sonotube Builder’s Tube concrete form. To maintain the desired placement of your concrete column, it is important that your Sonotube Builder’s Tube concrete form remain stationary until the concrete sets.

Strip: Sonotube Builder’s Tube concrete forms are designed to be left in place. Should you desire to strip the forms, be sure to use a reliable release agent before pouring the concrete. Remove the forms as soon as possible after a24-hour curing period. Cut the forms vertically, using a knife or power saw. (Note: no warranty is extended on the finished concrete surface.)

Storage: If temporary storage is necessary, place tubes on an elevated platform at least 4 inches off the ground and cover, allowing circulation of air through the tubes.

Depend on Sonotube quality 

Sonotube concrete forms, the industry standard for more than 70 years, are respected for their superior strength-to-weight quality and durability. They are recognized as the most economical way to create columns for buildings, and to provide structural support and footings. 

Working with Sonotube Builder’s Tube 

Our concrete forms are built strong to withstand the heavy pressure of wet concrete. The one-of-a-kind Sonotube Builder’s Tube concrete form is designed for below ground-line concrete placement, but can be used up to 3 feet above ground line for extra support. Minimal bracing is required above 2 feet of ground line.


  • Decks 
  • Fence and lamp posts 
  • Swing sets 
  • Mailbox posts 
  • Basketball goals 

Features and benefits 

  • Professional results 
  • Conforms to building codes
  • Economical 


Available in 6", 8", 10" and 12"diameters in standard lengths of 4', 8' and 12'.