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Round Concrete Form

Lightweight and easy to handle. Easily sawed to proper length on job site. Versatile and can be cut, drilled or scored for numerous construction applications. Available in a variety of types and sizes to meet different forming needs. Placing, bracing, pouring, stripping and finishing require less time and less labor. Skilled labor not required as with permanent forms. One-piece forms for a multitude of one-time uses. Concrete forms require no cleaning, reassembling or return shipping. And, you can set and pour multiple columns at one time.

 No. Diameter Length Wt/Lf   

Cubic Yards,
Concrete/ft of height 

 ST 6L  6"  12' Regular Wall  0.71  .0073
 ST 8L  8"  12' Regular Wall  095  .0129
 ST 10L  10"  12' Regular Wall  1.32  .0202
 ST 12L  12"  12' Regular Wall  1.70  .0291
 ST 14L  14"  12' Regular Wall  2.31  .0396
 ST 16L  16"  12' Regular Wall  2.69  .0517
 ST 18L  18"  12' Regular Wall  3.39  .0654
 ST 20L  20"  12' Regular Wall  3.76  .0808
 ST 24L  24"  12' Regular Wall  5.07  .1164
 ST 30L  30"  12' Regular Wall  8.44  .1818
 ST 36L  36"  12' Regular Wall 10.11  .2618
 ST 42L  42"  12' Regular Wall 12.50  .3563
 ST 18  18"  18' or 20" heavy Wall       4.67  .0654
 ST 20  20"  18' or 20" heavy Wall  5.18  .0808
 ST 24  24"  18' or 20" heavy Wall  7.34  .1164
 ST 30  30"  18' or 20" heavy Wall  11.26  .1818
 ST 36  36"  18' or 20" heavy Wall  13.51  .2618
 ST 48  48"  10' Heavy Wail  21.60  .4654
 ST 60  60"  10' Heavy Wall  27.30  .7269

Other Lengths available on request

Round Concrete Form


How to store

Store concrete forms in a dry place at the job site:

For best results, store forms vertically to maintain roundness.
Keep ends covered at all times.
If stored horizontally, elevate a minimum of 4 inches off the ground and support the full length of the forms.


Even the largest concrete forms are easier to place either manually with block and tackle, or by crane:
Position over a reinforcing bar cage if desired.
Avoid damaging the inside surface.
Place individually or in groups for continuous pouring.


Concrete forms require minimal bracing to be brought to plumb:

Use light lumber or scaffolding.
Secure the column foot with collars if necessary.
If pouring bents for bridges, consider tying the column form in with the beam form.

Concrete forms can also be tied into other forms or structural members.


Note: Use a release agent with all forms, especially when working with aggressive concrete formulations.

Concrete forms are engineered not to buckle, swell or lose shape, and have been successfully used with a continuous pour of column. Do not exceed ACI-recommended pour rates.


Strip the form as soon as possible after the concrete has set to prevent concrete from sticking to the form. Recommended time for the easiest and fastest stripping is 24 to 48 hours after the pour. Concrete forms should not be left on the column for more than 5 days.

Stripping options:

Use a circular power saw to make two vertical cuts on opposite sides of the form. To prevent marring, make sure the depth of cut is not set too deep. Remove the form.
Use a utility knife to cut the form from the top down at least 12 inches. Use a broad-bladed tool such as a shovel and short strokes to pry the form away from the column in a spiral motion. Stripped forms can be used to protect finished columns until completion of project.



Finish Free Round Concrete Form

Finish Free Round Concrete Forms

Coated to impart a smooth, finish-free surface. They easy to set up and brace. Rain-resistant and durable in all kinds of weather. Available in a variety of types to meet different forming needs. Easy to cut and drill at the job site. Designed with superior strength-to-weight properties to prevent blowouts. Easy to remove with the RipCord stripping filament. One-piece forms for one-time use. Sonotube concrete forms require no cleaning, reassembling or return shipping. And, you can set and pour multiple columns at one time.

Special handling instructions for Sonotube Finish Free forms:

♦ Do not dent or scratch interior coating.
♦ Do not drop; extreme physical shock may crack interior coating.
♦ Protect from extended rain and excess moisture.
♦ Punctures or excessive gouges in the form may cause blowouts. When cutouts are required, the opening should be waterproofed and reinforced to prevent blowouts.
♦ Vibrate the column using a regular vibrating needle. Do not touch the inside surface of the form with the vibrating needle; this may damage the finish.
♦ Never vibrate the concrete form from the outside.

Stripping procedure:

♦ Detach the RipCord stripping filament at the top of the form and wrap around a hammer or other tool handle.
♦ Pull strap straight down from the top of the form to tear through the form wall and remove the form.
♦ Stripped forms can be used to protect finished columns until completion of project.