Length - 04:22 Find Concrete Saws, Blades & Engraving Tools The cut-off concrete saw is used to cut contraction joints, sometimes called control joints, in a concrete slab. The joints are cut to encourage the concrete to crack where a joint has been pre-cut instead of in the middle of the slab. Cut-off saws are most often used on decorative stamped concrete patios, or driveways and pool decks where there are deep texture patterns. In this case, using a concrete groover is inappropriate. Additionally, a walk-behind saw on wheels does not work well either. The reason is that the saw will move up and down with the texture pattern creating an uneven saw cut. When cutting a contraction joint be sure to calculate the appropriate depth the saw cut needs to be. A true contraction joint, or control joint, is ΒΌ of the slabs overall thickness. For example, if your slab is 4 inches thick, the control joint needs to be cut 1 inch deep. To get the saw started, use the choke to prime the gas lines. Follow up by giving the saw a little gas before you start the engine. Be sure your control joints are cut straight by first snapping a line with talcum powder, and then use a 1 inch by 4 foot piece of lumber as a guide. For safety, use eye protection, ear plugs, and an OSHA approved respirator.
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