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30x40 shop concrete advice

V

vandal

New member
Joined
Aug 15, 2012
Messages
1
Good day been here for some time but this is my first post and I need some advice.

After many years of delays I have started building my shop. It is a slab on grade 30x40x12 the biggest my township will allow. Currently site prep is done concrete forms are in place and the concrete trucks are booked for next week.

This will be my 4th slab that I have poured so I am not worried about the work involved. However since prices of everything have gone through the roof I do not want to order too much concrete.
Right now concrete is over $300 a yard in my area.

Slab is a 18"x12" thickened edge tapered up at 45 to 6" floor. I calculated the amount need just under 30 yards.

Now I have always order some extra to insure I has the right amount to finish the job, but I have never had the amount of rebar, wire mesh and pex in the slab that I have in this one.

So my question is should I take these items into account when ordering the concrete and not order extra or even order less then the 30 yards?

If ordering less then the 30 yards what is the best way to calculate the volume of the mesh.

600 feet of 5/8" rebar
1160 sq feet of 6x6x6 mesh
1250 feet of 1/2 pex

Thank you
 
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J

jack stand

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Joined
Feb 29, 2012
Messages
3,345
Location
Lakes Region Maine
What's the (legal weight) yardage for a maximum load in your state?
Often you can hold the last truck for adjustment after a little jobsite math but 9 yds is the maximum in a lot of areas.
(so you might be into 4 trucks)
A lot of drivers are VERY good at their jobs and once the 3rd truck is placed you and the driver estimate the last load. They never ding me for a short load at the end of several full loads. It's the 2 yd job that gets the minimum charge in my experience.
Have a great pour👍
 
C

ConCretin

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Joined
Jan 20, 2011
Messages
3,379
Location
Central Maine
With all due respect, you are overthinking this. Slight variations in finish and sub grade elevations will make far more difference than the items imbedded in the slab. For example, your rebar will displace .05 cy but a variance of 1/4" in depth results in a difference of 1 cy.

Assuming the slab depth is 12" at the perimeter, I came up with 27 cy for your slab. If my sub grade was decent, I'd order 28 cy and carry on. The consequences of being short are far worse than eating an extra yard of concrete.

Congrats and good luck!
 
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R

River Runner

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Sep 17, 2018
Messages
80
Location
Cascade Idaho
Dang, I thought our $225 a yard was astronomical!

I’ve found that rebar or pex makes so little difference it can’t really be factored as volume removed.

Good luck!
 
D

Dreamshop

Well-known member
Joined
Feb 7, 2022
Messages
71
luvtheheat said:
Can you explain this? "tapered up at 45"....

Any benefit to so thick at the edges? Seems a bit overkill.

What PSI you using? Planning a lift?

Thanks
Click to expand...
In my area I had to have an engineered slab drawing. They did it exactly like that
 

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E

eegger

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May 31, 2020
Messages
137
Location
WI
It’s a floating slab, very standard. thicker at the edge supports the weight of the building and locks the slab in place
 
L

luvtheheat

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Joined
Jan 28, 2017
Messages
489
Location
Tucson AZ
eegger said:
It’s a floating slab, very standard. thicker at the edge supports the weight of the building and locks the slab in place
Click to expand...
Eegger, I see you are in Wisconsin. Is this design due to deep frostline in cold climates?

Where I live I've never seen that style.

Following is very common in Southwest. Zero frostline :)

stemwall.png
 
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