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Broom Finish

A textured concrete surface created by dragging a broom across wet concrete for slip resistance

A broom finish is a textured concrete surface created by dragging a broom across wet concrete after troweling. The resulting pattern of fine lines provides slip resistance for exterior horizontal surfaces like driveways, sidewalks, and pool decks. Broom finishing is the most common texture for residential flatwork.

Why It Matters

Smooth troweled concrete becomes dangerously slippery when wet. A light rain or morning dew makes smooth driveways, patios, and sidewalks into skating rinks. Broom finishing solves this by creating thousands of tiny grooves that channel water and provide grip. The texture is subtle enough not to be uncomfortable underfoot but pronounced enough to significantly improve traction.

The technique is simple but requires good timing. Broom too early and grooves fill in or smear. Broom too late and the surface is too hard to texture. The sweet spot is when concrete has lost its sheen but still accepts the broom without tearing. Most DIYers get decent results on their first try—it's a forgiving technique.

Technical Details

Broom types:

Soft bristle brooms:

  • Fine texture, light lines
  • Comfortable walking surface
  • Moderate slip resistance
  • Best for patios, walkways

Stiff bristle brooms:

  • Coarse texture, deep lines
  • Maximum slip resistance
  • Can be uncomfortable barefoot
  • Best for driveways, steep slopes

Specialty concrete brooms:

  • 24-48 inches wide for efficiency
  • Adjustable handles
  • Designed for concrete (standard house brooms work but wear quickly)

Broom finish technique:

  1. Timing:

    • After final troweling
    • When surface has lost water sheen
    • Concrete should hold texture without filling in
    • Typically 30-90 minutes after troweling

  2. Direction:

    • Perpendicular to drainage slope (water flows across lines)
    • Parallel to traffic direction for patios (more comfortable)
    • Consistent direction across entire surface

  3. Method:

    • Overlap each stroke slightly
    • Maintain consistent pressure
    • Long, smooth strokes (don't stop mid-stroke)
    • Rinse broom frequently

  4. Pattern options:

    • Straight lines: Classic, easiest
    • Wavy lines: Decorative, requires skill
    • Arc pattern: Architectural, difficult to execute
    • Checkerboard: Alternating directions

Texture depth:

  • Light: Soft broom, light pressure, fine texture
  • Medium: Standard pressure and broom
  • Heavy: Stiff broom, firm pressure, coarse texture

Common broom finishing mistakes:

  • Too early: Lines fill in, surface tears
  • Too late: Can't create texture, broom skips
  • Inconsistent pressure: Uneven texture
  • Stopping mid-stroke: Visible marks
  • Changing direction: Pattern looks erratic
  • Not rinsing broom: Paste buildup creates smooth spots

Curing after brooming:

  • Wait for bleed water to evaporate completely
  • Apply curing compound or plastic sheeting
  • Misting concrete is ideal (maintains moisture without washing texture)
  • Avoid spraying directly on fresh texture (can wash out lines)

Slip resistance ratings:

  • Smooth troweled: COF 0.4-0.5 (slippery)
  • Light broom: COF 0.5-0.6 (adequate)
  • Medium broom: COF 0.6-0.7 (good)
  • Heavy broom: COF 0.7-0.8 (excellent)
  • COF = Coefficient of Friction (higher = more slip resistant)

Alternatives to broom finish:

  • Exposed aggregate: More texture, decorative
  • Salt finish: Fine texture, architectural
  • Stamp texture: Decorative patterns
  • Trowel finish with sealer: Indoor applications

For most residential exterior concrete, a medium broom finish provides the ideal balance of slip resistance, appearance, and comfort. It's economical, durable, and easy to maintain. Save smooth finishes for indoor applications and heavy textures for steep slopes or high-traffic commercial areas.

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