A concrete chainsaw exists to do the one thing a disc cannot: plunge straight in and finish a square corner at full depth. Yards hire the saw at roughly $120 to $220 a day, and on hydraulic models the power pack is a separate line beside it. Water and a diamond chain are the other two things the job needs before anything is cut.
Depth and the square corner
A diamond chain on a 15 inch bar cuts about a foot in a single pass and leaves the corner clean, which is why door openings, sump pits and window cuts go to this tool. A disc saw of matching depth leaves an overcut at every corner that then has to be finished by hand or left on show.
The power pack is half the hire
Hydraulic saws need a power unit sized to their flow and pressure, and it arrives with hoses, couplers and its own fuel. High cycle electric saws need the matching converter and a supply that will carry it. Confirm what drives the saw when you reserve, because it is the pairing the branch has to have free.
Water is not optional on this tool
The chain is cooled and flushed with water, and running dry ruins a chain in minutes and throws dust everywhere. Plan the supply, whether that is a tap, a pressure tank or a bowser, and plan where the slurry ends up. Federal rules on respirable crystalline silica treat wet cutting as the control for work like this.
Rebar, and what the chain is billed for
The chain will cut reinforcement, more slowly and at a price, because every bar wears diamond away. Yards measure the chain out and back and bill the wear, so the return ticket carries a line the rate card never showed. Say up front if the slab is heavily reinforced and ask which chain is fitted.
Questions people ask about concrete chainsaw rental
Is a concrete chainsaw handled like a wood chainsaw?
The grip is similar and the risks are not. The bar can kick with far more force behind it, the cut is heavy and wet, and federal rules on concrete equipment expect guards and controls intact. Do not run one alone above ground level or over a void you cannot see into.
How deep can a hired saw actually cut?
About a foot on the common 15 inch bar and more on larger machines, working from one face. Where the wall is thicker than the bar you cut from both sides and line the two cuts up, which takes marking through and patience. Ask which bar lengths the branch keeps.
Do I need one, or will a ring saw do?
A ring saw cuts deeper than a standard disc and is faster along a straight run. It cannot plunge cleanly into a corner. If the cut is a straight line in a slab, take the ring saw or a walk behind. If the opening has corners that must be square, take the chain.