Concrete Finisher how-to
How to Cut Control Joints
Concrete cracks. Joints decide where.
Quick answer
Concrete cracks. Joints decide where. In short: plan; tool; cut, then complete the remaining steps below.
Step by step
Plan joint spacing; a common rule is two to three times the slab thickness in feet.
Tool joints in fresh concrete with a groover, or saw-cut once it can support the saw.
Cut to about one quarter of the slab depth.
Use early-entry saws or cut as soon as the surface won’t ravel.
Keep panels roughly square.
Safety reminders for concrete finishers
- Wear waterproof boots, gloves and long sleeves to prevent concrete burns
- Wash wet concrete off skin immediately
- Control silica dust when saw-cutting and grinding
- Stay clear of chutes, pumps and backing trucks
Key terms
Screed · Bull float · Bleed water · Troweling · Power trowel · Edger: see the full concrete finisher glossary.