How to Cut Sonotube

Concrete form tube cutting has gotten messy with all the diameter variations, cut techniques, and accuracy requirements flying around. As someone who has used sonotubes for every foundation type, I got hands-on with getting clean cuts. Today, I will share it all with you.

What Sonotubes Are

Probably should have led with this issue, to be candid—sonotubes are cardboard forming tubes for round concrete columns and footings.

Cutting Methods

That’s what makes technique selection endearing to us concrete workers:

• Hand Saw: Works for all sizes, slower but controlled
• Circular Saw: Faster for larger tubes
• Reciprocating Saw: Good for field cuts

Steps for Clean Cuts

1. Mark cut line around entire circumference
2. Use tape as guide for straight line
3. Support tube to prevent rolling
4. Cut slowly for clean edge
5. Remove any ragged edges

Tips

• Keep blade perpendicular for square cuts
• Rotate tube while cutting for even depth
• Use fine-tooth blade for cleaner edge
• Wear dust mask—cardboard dust is irritating