Concrete cutting and coring jobs carry real consequences—poor execution can compromise structural integrity, create safety hazards, and lead to costly repairs. After your contractor finishes the work, a systematic inspection protects your investment and ensures the job meets specifications. Here's what you need to verify before signing off.
Visual Surface Inspection
Start with the obvious: examine the cut or cored section under good lighting. Look for clean, straight edges on linear cuts and round, centered holes on cored sections. Jagged edges, chipping at corners, or uneven depth indicate sloppy work or dull blades. Run your hand along the cut (carefully—edges are sharp) to feel for rough patches or deviations from the planned line.
Check that the cut stays within tolerance. Most concrete cutting specifications allow ±1/8 inch deviation from the marked line for precision work, though some projects require tighter tolerances of ±1/16 inch. If your contract specifies a tolerance, measure the cut at multiple points with a straightedge or measuring tape to confirm compliance.
Depth and Dimension Verification
Measure the depth of cuts and the diameter of cores using a tape measure or calipers. A common mistake is under-cutting—where the blade doesn't go as deep as specified. For saw cuts, depths typically range from 1 inch for shallow control joints to 12+ inches for structural cuts. Cores range from 2 inches to 48 inches in diameter depending on the application.
Mark the measurement points on your inspection checklist so you can document specifics. If the work is shallow by 1/4 inch, the contractor should be able to tell you why—legitimate reasons include hitting reinforcing steel or obstacles. Unacceptable answers include "didn't think it mattered" or guesses about depth.
Check for Damage to Surrounding Areas
Concrete cutting generates significant vibration and dust. Inspect areas adjacent to the cut or core for cracks that weren't there before the work. Hairline fractures radiating from the cut site within 6–12 inches are relatively common but should be documented. Larger cracks or damage to distant concrete sections suggest the contractor used excessive force or improper techniques.
Look at the concrete surface for:
- Spalling or pop-outs (small chunks missing from the surface)
- Crushed edges where the blade pressed into corners
- Radial cracking extending outward from the cut
- Dust and residue that should have been cleaned up
The contractor should have controlled dust with wet-cutting methods or dust collection systems. If the work site is covered in fine concrete powder and nearby surfaces are coated, that's a sign corners were cut.
Reinforcing Steel Exposure
If your cut or core intersected reinforcing steel (rebar, post-tensioning cables, or welded wire fabric), verify it wasn't damaged. Bent or severed rebar compromises structural capacity and requires immediate repair. The contractor should have exposed steel cleanly without deep gouges.
For post-tensioned concrete, damage to cables is a serious structural issue. If the contractor hit cables during the work, they must stop immediately and notify the structural engineer. This is non-negotiable—do not allow the work to continue until a professional assesses the damage.
Water and Dust Management Documentation
Ask the contractor for evidence of wet-cutting or dust suppression. Modern concrete cutting uses water to control dust and cool the blade—it's standard practice for jobs in occupied spaces or near HVAC systems. If the job was performed dry with no dust mitigation, that's a red flag, especially in areas with sensitive equipment or occupied zones.
Request photos or documentation showing the dust control measures used during the work. Reputable contractors include this in their completion reports.
Final Measurements and Sign-Off
Before paying in full, get the contractor to provide written documentation of final dimensions, depths, and any obstacles encountered (like rebar locations). This protects both parties and serves as proof if disputes arise later. Typical concrete cutting costs range from $2–$8 per linear foot for standard cuts and $150–$400+ per core depending on size and depth—making documentation of work quality essential.
If you're comparing cutting contractors, platforms like Mercoly let you review multiple providers' past work and customer feedback in one place, helping you choose contractors with strong inspection records.
Frequently Asked Questions
Q: What should I do if the cut is shallower than specified? Contact the contractor immediately with measurements and photos. Shallow cuts often fail their intended purpose (controlling cracks or exposing utilities), so this requires correction before paying final invoices.
Q: Is it normal to see small cracks near a concrete cut? Minor hairline cracks within 6 inches of a cut are common, but large cracks or cracks in distant sections suggest improper cutting technique and should be documented and addressed.
Q: How long does a concrete cutting job typically take to inspect? A thorough inspection takes 30–60 minutes depending on the scope—expect to measure multiple points, document damage, and verify dust control.
Get multiple contractor quotes and ask about their inspection protocols before hiring.