Delaying final troweling until the surface sets is likely to reduce floor flatness.

Delaying final troweling until the surface sets is likely to reduce floor flatness.

• A. True
• B. False
• C. Not sure
• D. It depends

Answer: (A)

Finishing a concrete floor to achieve maximum flatness depends on working the surface while it’s still plastic. When the surface is plastic, the trowel can blend highs and lows and close the surface pores, creating a smooth, level plane as it compacts slightly and removes imperfections. If you wait until the surface starts to set, the paste stiffens and loses workability, so the final trowel can’t move the surface evenly. That fixes any existing waviness or low spots as the slab hardens, leading to a less flat floor with ridges or hollows. So timing the final trowel before full set is essential for maintaining good floor flatness.

Finishing a concrete floor to achieve maximum flatness depends on working the surface while it’s still plastic. When the surface is plastic, the trowel can blend highs and lows and close the surface pores, creating a smooth, level plane as it compacts slightly and removes imperfections. If you wait until the surface starts to set, the paste stiffens and loses workability, so the final trowel can’t move the surface evenly. That fixes any existing waviness or low spots as the slab hardens, leading to a less flat floor with ridges or hollows. So timing the final trowel before full set is essential for maintaining good floor flatness.