On slabs with many protruding pipes, a ______ works better than a ______ for smoothing the surface.

On slabs with many protruding pipes, a ______ works better than a ______ for smoothing the surface.

• A. Darby; Bull float
• B. Bull float; Darby
• C. Magnesium float; Bull float
• D. Hand float; Trowel

Answer: (A)

When a slab has many protruding pipes, you need a finishing tool that can work close to irregularities with precise control. A Darby fits that need because its narrow blade and maneuverable edge let you smooth right up to each pipe, feathering the surface around the protrusions and filling any small hollows without catching on the pipes. A bull float, by contrast, is wide and less able to navigate around obstacles, so it tends to skim over or push aside the protrusions and can create rough spots or gouges. Other floats can finish surfaces, but they don’t offer the same fine control around multiple protrusions as a Darby, making it the better tool for this situation.

When a slab has many protruding pipes, you need a finishing tool that can work close to irregularities with precise control. A Darby fits that need because its narrow blade and maneuverable edge let you smooth right up to each pipe, feathering the surface around the protrusions and filling any small hollows without catching on the pipes. A bull float, by contrast, is wide and less able to navigate around obstacles, so it tends to skim over or push aside the protrusions and can create rough spots or gouges. Other floats can finish surfaces, but they don’t offer the same fine control around multiple protrusions as a Darby, making it the better tool for this situation.