Can you cut through concrete with rebar in it?
Yes. Diamond blades and core bits cut straight through rebar reinforced concrete; it is the normal condition of nearly every commercial slab in the Jackson metro. Steel slows the cut and wears the blade, so heavy reinforcement moves a job toward the top of the published per-foot or per-hole band. The one thing never cut blind is a post-tension cable.
Can you cut through concrete with rebar in it, or does the steel stop the saw?
The steel does not stop the saw. A diamond blade does not chop concrete the way a wood blade chops a board; it grinds, with industrial diamonds set in a metal segment that wears away at a controlled rate. When the segment reaches a #4 bar it grinds through the bar the same way, just slower, and a blade bonded for reinforced concrete is made so the steel keeps the diamonds exposed instead of glazing them over. Core bits work the same way in a circle. What you hear on site is the pitch of the saw dropping for a few seconds at every bar, then picking back up.
Where callers get surprised is the cost side, and only because nobody told them up front. Steel content is one of the two things that moves a slab sawing price inside its band, the other being depth. A six inch slab with light mesh cuts near the bottom of the band. The same six inches with #5 bars both ways and dowels at every joint cuts near the top, because the crew is grinding steel for a good part of every foot. Neither is a change order; both are on the sheet.
How do you know where the rebar is before you cut?
Three ways, in order of cost: the drawings, the age of the slab, and a ground penetrating radar scan. Structural drawings show bar size and spacing outright. The slab’s age and use predict the rest: a 1960s shop floor on Highway 49 is likely heavy mesh or #4 bars at wide spacing, a modern loading dock is a tight mat of #5s, and a parking deck or elevated office floor built after the 1980s may be post-tensioned. When none of that is certain, or the slab is suspended, a GPR scan maps every bar, cable and conduit before the blade touches concrete. It sits on the published rate sheet as a pass-through, and on suspect slabs it goes on the quote by default.
Rebar itself is not the danger. The danger is what sits near it: a tensioned cable, an electrical conduit, a radiant loop. A cut rebar end is a cut rebar end. A cut post-tension cable can release with enough force to hurt someone and crack the slab edge, which is why no serious crew cuts a post-tensioned deck without a scan and marked cables.
What each kind of steel does to the cut and the price
| What is in the slab | Effect on the cut | Where it lands on the sheet |
|---|---|---|
| Welded wire mesh (6x6 sheets, light gauge) | Barely noticed; cuts at nearly plain-concrete speed | Bottom of the per-foot band |
| #3 or #4 rebar on a 12 to 18 inch grid | Routine; blade segments grind through each bar in seconds | Middle of the band |
| #5 and larger bars, double mats, dowels at joints | Slows every foot and wears blades faster | Top of the band, called out on the quote |
| Post-tension cables (parking decks, some office slabs) | Never cut blind; GPR locate and mark first | Scan pass-through added, cut priced after the scan |
| Embedded conduit, radiant tubing, drains | Not steel reinforcement, but the costliest thing to hit | Scan pass-through on suspect slabs |
What does cutting rebar reinforced concrete cost in Jackson?
The same per-foot and per-hole rates as any other slab, with the steel deciding where in the band the job lands. Slab sawing on a four to six inch slab runs $6 to $12 per linear foot on the published sheet, and the sheet says in plain words that heavy rebar slows every foot. A single core up to six inches runs $300 to $500, with cores through dense steel at the top. A GPR scan adds $400 to $800 as a pass-through where it is needed. Depth, access and the amount of steel together set the number for your slab, and every slab is different, so send photos and thickness and you get a written number the same day instead of a guess from a page.
One more cost that is not on the cutting side: dust. Grinding steel and concrete together throws silica, and the federal silica rule for construction sets exposure limits and names wet cutting and shrouded vacuums as the standard controls. The OSHA construction silica standard is the reference, and NIOSH explains why it exists. A crew that cuts a reinforced slab dry in an occupied shop is cutting corners that cost more than the job.
What to have ready when you call about a reinforced slab
- 1
Slab age and what the building was built for
A 1960s truck shop, a 1990s strip retail slab and a new dock slab each carry predictable steel. The age narrows it before anyone scans.
- 2
Thickness, if you can get it
Drill a small test hole or measure at an existing opening. Four inches with mesh and eight inches with #5 bars are different jobs by the foot.
- 3
Drawings or as-builts, if they exist
A structural sheet shows the bar size, spacing and whether the slab is post-tensioned. It can replace a scan on a slab on grade.
- 4
Where the cut goes, marked on the floor
Photos of the marked layout let us count feet and judge whether the opening crosses anything structural.
- 5
Anything unusual under the slab
Radiant heat, floor drains, old pits, trench drains that were filled in. Anyone who worked in the building usually knows.
Rebar cutting near Richland and the rest of the metro
The heaviest steel we cut sits in the equipment dealer and truck shop slabs along Highway 49, which is why the rebar cutting near Richland page goes into shop floors, wash bay trenches and lift anchor cores in detail. The same crew and the same sheet cover Pearl, Flowood, Ridgeland and the rest of the service area, with no travel charge. For the questions to ask any cutting contractor about scanning, slurry and insurance before they mobilize, the hiring questions article has the list.
Rebar questions, answered straight
Does cutting through rebar weaken my slab?
Cutting the bar at the edge of an opening does not weaken the slab around it. The concrete carries its load through the steel that remains. What matters is where the opening goes: a trench across the middle of a structural suspended slab is an engineering question, a trench in a slab on grade is not.
Can you core drill through rebar?
Yes. A diamond core bit drills straight through #4 and #5 bar and welded wire mesh. It slows the hole and wears the bit faster, which is why cores through heavy steel sit at the top of the per-hole band rather than the bottom.
What if the slab has post-tension cables instead of rebar?
Then nothing gets cut until the cables are located and marked with ground penetrating radar. A tensioned cable holds thousands of pounds of force, and cutting one can injure a worker and damage the slab. Post-tensioned slabs are common in Jackson metro parking decks and some office floors; look for a stamped warning near the slab edge or ask for the drawings.
Do you need to see the slab before quoting a reinforced cut?
Photos, thickness and the slab age usually do it. A cut in a 1970s shop floor with heavy mesh prices the same way a cut in a 2015 dock slab with #5 bars does: by the foot, with the steel noted. Send what you have and the written number comes back off the public sheet.
Price a cut through a reinforced slab
Send the address, photos of the marked cut, the slab thickness and age if you know them. The written number comes back off the public sheet with the steel accounted for.