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-   -   Concrete slab for an rv. (http://www.diychatroom.com/f105/concrete-slab-rv-138918/)

ZONKER22 04-01-2012 12:05 PM

Concrete slab for an rv.
 
I need the formul for figuring out how many yards of concrete i need for a slab thats 12 feet wide, 30 feet long and 4 inches thick.

joecaption 04-01-2012 12:13 PM

http://www.colemanconcrete.com/concrete-calculator.html

TarheelTerp 04-01-2012 04:37 PM

Quote:

Originally Posted by ZONKER22 (Post 889671)
...12 feet wide, 30 feet long and 4 inches thick.

27 cubic feet per cubic yard (3x3x3)

12 feet x 30 feet = 360 square feet
360 SF x .333 (1/3 of a foot or 4") = 119.88 cubic feet
120 CF /27 = 4.44 Cubic Yards

stadry 04-02-2012 09:11 PM

or you could ask a 5th grader to figure the volume - plan on 5% waste when ordering the mud

sublime2 04-02-2012 09:23 PM

Quote:

Originally Posted by itsreallyconc
or you could ask a 5th grader to figure the volume - plan on 5% waste when ordering the mud

Or you could come to a website like this one and ask that question to possibly thousands of people who have had that experience and could also suggest things you may not have thought of.

I'd choose the latter over a 5th grader.That's just me though.......

stadry 04-03-2012 06:52 AM

thinking further, you might need a more educated source as public schools rarely do the thorough collective job for which we hire teachers these days,,, then again, its not difficult to be a teacher - so few wrong answers to check off & be sure little johnnie's self-esteem is well stroked :whistling2: seems education is often the death knell of common sense

jomama45 04-03-2012 02:57 PM

Here's the easiest answer I can give for this, and future similar questions:
(Not that there's anything wrong with asking....)

4" thick covers 81 sq. feet per yard.

4.5" thick covers 72 sq. feet per yard.

5" thick covers 65 sq. feet per yard.

6" thick covers 54 sq. feet per yard.

8" thick covers 40 sq. feet per yard.

Of course, as IRC mentioned, add at least 5% additional on smaller jobs especially.


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