How to Finish Concrete: Bull Float, Edging & Brooming

Concrete finishing is an unforgiving process driven by chemical hydration timing: 1. **Screeding (Strike-off):** Immediately level wet concrete flush with form tops using a straightedge. 2. **Initial Bull Floating:** Float the surface within minutes of screeding to embed large gravel aggregate and bring creamy cement paste to the top. 3. **The Bleed Water Waiting Period:** As concrete settles, excess water rises to the surface. **Do not touch the concrete while bleed water is visible.** 4. **Edging & Grooving:** Tool rounded border corners and cut control joints once the slab can support knee boards with less than 1/4-inch indentation. 5. **Final Troweling or Brooming:** Float with magnesium, finish-trowel with steel (interior) or pull a broom (exterior non-slip).

Review the purpose and application window of each masonry finishing tool:

1. **Bull Floating Pitch:** Push the bull float across the slab with the front edge tilted slightly up. Pull it back across the slab flat with the rear edge tilted up. Keep blade angle shallow (less than 1 inch of lift) to avoid gouging. 2. **Evaporate Bleed Sheen:** Watch the surface carefully. In dry warm weather, bleed water clears in 30 to 60 minutes; in cool humid weather, it may take 2 hours. 3. **Knee Board Edging:** Place 2x2 ft plywood knee boards on the slab. Run the edger along perimeter forms using long, continuous back-and-forth strokes until edges are mirror-smooth. 4. **Hand Floating:** Float the surface with a 16-inch magnesium hand float in wide sweeping arcs to erase edger lines and consolidate the cream. 5. **Apply Broom Finish:** Dip a concrete finish broom into clean water and shake off excess. Pull the broom lightly in one continuous, straight stroke toward you. Overlap each stroke by 1 inch for uniform texture.