Rebar, Mesh, Thickness and Joints: What to Ask Before Anyone Pours Concrete on Your Property

Concrete is the hardest trade for a homeowner to evaluate, for one reason: the entire quality of the work is decided before and during a single day, and most of it is invisible the moment the finishers leave.

You cannot inspect a finished slab and tell whether it has the right reinforcement, whether the subgrade was compacted, or whether it was cured. You can only tell years later, by whether it failed.

So the evaluation has to happen before. These are the six questions, and what a good answer sounds like.

1. What is the subgrade preparation?

What you want to hear: that the organics are being stripped, that the soil is being compacted at proper moisture content, and what depth of aggregate base is going in and in how many lifts.

What should worry you: any version of "we will grade it out and pour." On clay soil in this valley, that is the answer that produces a cracked slab in two winters.

2. What thickness, and where is it thicker?

What you want to hear: a specific number, and a thickened section wherever a concentrated load lands — an edge that a vehicle crosses, the footprint of a spa, the line where a post will land.

What should worry you: a single thickness for a slab that has a vehicle on part of it and foot traffic on the rest.

3. What reinforcement, and how is it held in position?

This is the question that separates crews, because the answer to the second half is where the shortcut lives.

What you want to hear: rebar at a stated size and spacing, on chairs. Or mesh, supported so it sits in the upper portion of the slab.

What should worry you: "we pull the mesh up as we pour." It sounds plausible and it is done constantly, and the result is mesh sitting on the bottom of the slab doing nothing. If you are going to be on site for one hour of the job, be on site for this one.

Reinforcement at the bottom of a slab is decoration. It only works where the concrete is trying to pull apart, which is not the bottom.

4. What is the control joint spacing, and when are they cut?

What you want to hear: joints spaced so the panels are not oversized and are roughly square, cut to the right depth, and cut soon after the pour rather than the next week.

What should worry you: no mention of joints at all, or a joint layout that leaves long narrow panels. Long narrow panels crack across the middle every time.

5. How is it being cured?

Concrete does not dry. It hydrates, and it needs water to do it. A slab that loses its water in the first days never reaches the strength it was ordered at.

What you want to hear: a specific curing method and a duration. Covering, wet curing, or a curing compound — and in a Temecula summer, a plan for pouring early and protecting the surface.

What should worry you: silence. Curing is the most commonly skipped step in residential concrete because nothing appears to go wrong when you skip it.

6. Which way does it drain, and to where?

What you want to hear: a direction, a slope, and a destination for the water that is not the house and not the neighbor.

What should worry you: "it will be level." Level flatwork against a structure is a design error, not a precision achievement.

Three more that are worth asking

• What mix are you ordering, and will there be a delivery ticket I can see? The ticket states what was actually delivered.

• Is anything being added to the mix on site? Adding water at the truck to make concrete easier to place reduces strength. It is common and it is invisible afterward.

• What is going under the slab before you pour — conduit, sleeves, gas, drain? This is the last cheap moment for all of it.

The license question, which is not optional

Concrete work at any meaningful scale in California requires a licensed contractor. You can verify a license in a couple of minutes on the Contractors State License Board site — the license number, the classification, the expiration, whether the bond is in place, and whether workers' compensation is on file.

Workers' compensation is the one people skip and the one that can cost the most. If an uninsured worker is injured on your property, the exposure can land on you.

The Ultimate Pro, Inc. holds California license number 831700, Class B general building, and has been building in Southern California since 1996.

What a fair quote actually contains

Not a square-foot price with a line for concrete. It should state the preparation, the thickness, the reinforcement, the joint plan, the finish, the curing, and the drainage. Six lines. If two quotes differ substantially, those six lines are where the difference lives — not in the concrete itself, which costs everyone roughly the same.

And if a contractor will not put those in writing, that is the answer to your question.

The right questions take five minutes and they change what you get for the same money. Book a free 15-minute call or call (323) 651-0635 and we will go through your specific project, including what a fair scope looks like.

There is usually a video for this. X Plan Nation is our construction channel on YouTube, built to explain the trades to the person paying for them, not to other contractors.