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Groovers

Purpose: Used to tool control joints in plastic concrete (as an alternative to sawcutting).

What's available: Groovers are usually made of bronze or stainless steel and have a V-shaped bit that cuts the groove. Like edgers, they come with wood or comfort-grip handles. The most common groover size is 6 inches long and 4 1/2 inches wide, but many other sizes are available, ranging from 2 to 8 inches wide and 3 to 10 inches long. However, more important is the dimension of the bit, which can be anywhere from 1/2 inch to 2 inches deep and 1/8 to 1 inch wide. Bi-directional groovers are also available and have double-end bits that give you the flexibility to cut forward or backward.

Buying tips:

• As with edgers, bronze or heavy-gauge stainless steel groovers will often deliver the best durability and performance. Some stainless steel tools come with highly polished finishes so they glide more easily through the concrete.

• The bit depth of the groover should be at least one-fourth the slab thickness to create a sufficient plane of weakness along which the slab can crack. So if you plan to groove a 4-inch-thick sidewalk, be sure to buy a tool with a 1-inch bit depth.

• For stand-up use, walking groovers are available with features similar to those of walking edgers. Or you can simply buy a special groover attachment that secures to your metal bull float or fresno trowel with thumb screws. Using more than one of these attachments on a float or fresno lets you cut multiple grooves in one pass.

Average costs: For a 6x4 1/2-inch groover, you'll pay about $25 or more for bronze and as much as $35 for heavy-gauge stainless steel.

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