how much does a 40' x 24' x 6 inch concrete slab cost?

how much does a 40x24x6 slab costWatch Us Pour This 40' x 24' x 6" Concrete Slab

This page will tell you what a 40 foot by 24 foot by 6 inch thick concrete slab cost.

The 40 x 24 slab cost will include:

  1. Concrete Yardage Costs
  2. Wire Mesh Costs
  3. Rebar Costs
  4. Labor To Form and Prep
  5. Labor To Pour and Finish the Concrete
  6. Other Costs to consider

I get hired to install a lot of concrete slabs in Maine. I install concrete slabs for houses, garages, and sheds.

My estimates and prices for concrete slabs include concrete, labor, reinforcement, poly vapor barrier (if needed), styrofoam (if needed), and anchor bolts (if needed).

The excavation, which includes digging out the original soil, installing gravel, compacting, and leveling the gravel is done by another contractor (an excavator). Their price is separate from mine.

I will estimate the cost of excavation so you can get an idea of what that will cost, but keep in mind, excavation and gravel costs will vary depending on your specific scenario.

40' x 24' x 6" concrete slab cost

The total cost of a 40' x 24' x 6" concrete slab is $11,520.00 or $12 per square foot.

  1. Total Concrete Yards = 20 @ $200.00 per yard ($4000)
  2. Wire Mesh - 20 sheets ($500)
  3. Rebar - 16 bars twenty feet long ($350.00)
  4. 6 Mil Poly Vapor Barrier ($200.00)
  5. Anchor Bolts ($50.00)
  6. Labor to set up forms, install wire, rebar, poly, place & finish concrete, saw contraction joints, remove forms ($6420.00

what is the average cost of excavation for a 40 x 24 x 6 concrete slab

The average cost for excavation for a 40' x 24' x 6" concrete slab is $5 per square foot or $4800.

That price includes: 

  • Excavating existing soil 12" to 24" deep
  • Installing base gravel and top gravel
  • compacting gravel in lifts (every 8" or so)
  • Leveling top gravel with a self leveling laser level

NOTE: Excavation costs will vary greatly depending on where you live and the location of where your slab is being installed. 

For example: If you're installing a concrete slab on the side of a hill, it will be much more expensive because of the added fill required, possibly a retaining wall needed, plus extra grading after the slab is installed.

what are some other concrete slab costs to consider?

Local codes may require you to install your concrete slab a specific way. The thickness of the slab may be different than 6". The thickness of the edges may have to be 12, 16, 18, or 24 inches thick. 

It really depends on what your state and local codes require. Our state, Maine, requires 2" of styrofoam under a slab thats 600 square feet or larger. An 8' x 4' sheet of 2" styrofoam costs about $50 dollars per sheet. 

When I estimate installing 2" styrofoam in a slab, I charge an extra $3.50 per square foot for labor and materials. (That's almost $3500 extra for a slab 40 x 24)

If you have to thicken the edges as I said above, that will raise the concrete slab cost by $1 to $2 dollars per square foot for the added concrete and labor it requires to make the edges thicker.

can you install a 40' x 24' x 6" concrete slab yourself

If you don't have any experience working with concrete, you may be better off trying to find a good concrete slab contractor to get the slab installed correctly.

But, if you can't find a good one, and / or the cost is too high, you can learn how to install concrete slabs by taking my concrete slab course. 

After going through all my training videos in the concrete slab course, you'll be much more educated as to how much work is involved and what it takes to install a concrete slab.

Then, you can make a decision if you want to attempt to try and install a concrete slab yourself.

in conclusion:

Keep in mind, what I charge to install a 40' x 24' x 6" concrete slab may be very different than what a contractor in your area might charge you.

I'm just giving you a basic idea of what this size concrete slab could cost. 

Some contractors will do both the excavation and concrete slab install.

If you're looking for a good concrete contractor, call your local concrete ready-mix company. Ask the concrete dispatcher for a few good concrete guys to get quotes from.

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