Concrete cost? 20x40 garage

DSM Turbos

DSM Turbos

Well-Known Member
Joined
Feb 25, 2006
Location
Raleigh, NC
Looked at a house today and it turned out the pole barn garage that is 20x40 (maybe 24x40) has a gravel floor. Any guess from anybody on what it would cost to concrete the floor on it?
 
The gravel is pretty large pieces and already fairly compact, not sure if they could pour right over. Just trying to figure out a round about number to even figure if the house is worth it
 
DSM Turbos said:
The gravel is pretty large pieces and already fairly compact, not sure if they could pour right over. Just trying to figure out a round about number to even figure if the house is worth it
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If its the way I'm think it is. (Gavel to ground level) could form around it with a 2x4 or 2x6 all the way around and pour to that level. I'd personally dig back a foot all the way around and dig down an extra 6in around the edges but not totally needed
 
Finished concrete is about $3-4 per square foot , so $2400-3200 total depending cost in your area, prep required, etc.


If you wanna do it yourself like the guy's neighbor in Durham, getting a truck to deliver concrete is about $120 -150 per square yard depending on load size and what's in the mix. That works out to about $1200-1500 for a 20x40 with a 4" thick slab.
 
Also they typically will put gravel down before concrete so it should be fine unless there's a height/transition issue caused by the extra 4".
 
If I had to guess..... $4/ft?? Plus minus .50?
 
Had some done last year...got several quotes...going rate is $200 a (cubic) yard finished (Lee County). At 4" thick, that works out to $2.47 per square foot.

20x40 should be around $1975.

How I do it....simple math:
20x40=800 sq. ft
800/3=266.67 cu.ft. required (think if you did a 12" pour at 1' thick, that is 800cuft of concrete...4" is 1/3 of 12", so divide by 3 -- divide by 2 for a 6" slab)
266.67/27=9.877 cubic yards required (there are 27 cu.ft. in a cu.yd. so divide by 27)
9.877*200=1975.30 cu.yd. times 200 (going rate per yard finished) is total cost

whatever your actual numbers are, just substitute (24x40, etc)
 
Not nearly as bad as I thought, I think I am going to pass on the house though, its over priced and the lot is big but its an awkward shape that really you can't use a lot of it.

Saw something else I like on the other side of town on the wake forrest boarder that I may go look at.
 
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