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Finishing

The process of smoothing and texturing the concrete surface after placement

Finishing is the process of smoothing, texturing, and preparing the concrete surface after placement. Proper finishing creates the desired surface texture and appearance while ensuring durability and preventing surface defects.

Why It Matters

Finishing makes or breaks the final appearance and performance of concrete. Poor finishing leaves a rough, uneven surface that's difficult to use and prone to scaling. Over-finishing brings excess water to the surface, creating a weak layer that spalls within months.

For DIY projects, rushing or skipping finishing steps is the most common mistake. Working concrete too early (while bleed water is present) or too late (after it's too stiff) produces poor results that can't be corrected without removing and replacing the concrete.

Technical Details

Standard finishing sequence:

1. Screeding (immediately after placement): Strike off excess concrete using a straight board, creating a level surface slightly above final grade.

2. Bull floating (5-30 minutes after screeding): Smooth the surface with a large float, embedding aggregate and removing high/low spots. Work in sweeping arcs, keeping the leading edge slightly raised.

3. Edging (after bleed water disappears): Round edges along forms using an edger tool. Prevents chipping and creates clean, finished edges.

4. Jointing (after edging): Cut control joints using a groover tool or saw. Controls where cracks occur.

5. Hand floating (when surface supports finger pressure): Further smooth the surface with a wood or magnesium float. Prepares for final troweling or creates a slip-resistant texture.

6. Troweling (for smooth finishes): Steel trowel creates a hard, smooth surface. Multiple passes increase smoothness and density. Not recommended for outdoor surfaces (too slippery when wet).

7. Brooming (for textured finish): Drag a broom across the surface creating texture for slip resistance. Standard for driveways, walkways, and pool decks.

Timing is critical—working too early causes scaling; working too late is difficult and causes trowel marks.

  • Floating - Early finishing step using a float
  • Troweling - Final finishing with steel trowel
  • Screeding - Initial leveling process

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