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WTK cost to cast an 18 X 18 concrete floor

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jsr
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WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 23rd, 2021, 7:32 pm

Whst is the average price to pay to csst an 28 x 18 concrete floor using manual labour Thanks
Last edited by jsr on February 23rd, 2021, 7:46 pm, edited 1 time in total.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby pugboy » February 23rd, 2021, 7:39 pm

call amy ready mix company
they will send a sales guy to work it out

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby timelapse » February 23rd, 2021, 10:50 pm

How thick?

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby daring dragoon » February 24th, 2021, 4:41 am

i did a 20x20 area 4" thick slab to park the car recently so there is no foundation and it cost $2500 labour, almost 3/4 load gravel and 14 bag of cement and probably 3/4 roll brc. it would have been cheaper to get readymix vs hand mix.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 7:25 am

I was looking at it being 3 inches thick with brc .
Also what about the option of renting a concrete mixer and do it myself?

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby pugboy » February 24th, 2021, 8:03 am

still plenty labour to shovel material into the mixer, unload it into barrow, carry to dump onto area and then float off

readymix you only need labour to level and float off and getting a better quality mix

jsr wrote:I was looking at it being 3 inches thick with brc .
Also what about the option of renting a concrete mixer and do it myself?

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby carluva » February 24th, 2021, 8:21 am

The minimum thickness for a slab should be 4". A vehicle bearing by slab such as a garage floor or driveway should be further reinforced with steel rebar.

The upfront cost for a proper slab may be slightly greater than what you may have budgeted in terms of proper thickness, concrete quality etc. However, long term costs are far less given that a poorly constructed slab which is too thin and made with inferior hand mixed concrete is prone to cracking, damage and failure at points.

The readymix options are also possibly the same cost and also possibly cheaper when you factor labour into the mix. However, in terms of quality, a premixed design far exceeds any hand mixed or on site mixer design as premixed concrete is done in the correct ratios to achieve proper strength and slum. While one may argue that the ration is 4 barrow or gravel to one bag of cement, there is no accuracy in the size or fill of a barrow.

My advice is do it properly the first time, 4", with steel if necessary and readymix. Also consider setting conduit and pipe for future use as you never know if there will be a future need for these which saves from having to tear up your floor at points.

Cost wise, a 28 X 18 X 4" slab should be about 5 cubic metres which may run between $4000 - 6000 for a 3000psi compressive strength, depending on supplier and wastage of capacity in truck.

Assuming the area to be cast is currently earth, no trees and no existing concrete:

Grubbing area - 2 labourer, 1 mason, 3 days. $3000.

Prep area for casting - 2 labourer, 1 mason, 1 day. $1000.

Cast is half day but pay them for a day. Same crew $1000.

Remove formwork and clean up is a next day for same crew $1000.

Conservatively and roughly you are looking at about 10-12k.

.
jsr wrote:I was looking at it being 3 inches thick with brc .
Also what about the option of renting a concrete mixer and do it myself?

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 8:48 am

I alrrady have half load of sharp sand that i have to use up ..hence why i may have to forego the readymix option

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby SR » February 24th, 2021, 9:54 am

Will still cost you more than going readymix.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby timelapse » February 24th, 2021, 11:02 am

What stage of prep are you at?have you cleared out the area,boxing etc.?How much load is the area supposed to take? Post pic uf you can.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 12:32 pm

Here isthe area . I can quickly put down the polythene .brc and boxing by myself sharp sand is in the background

20210221_111954_compress80.jpg
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Re: WTK cost to cast an 18 X 18 concrete floor

Postby Rory Phoulorie » February 24th, 2021, 12:42 pm

jsr wrote:Here isthe area . I can quickly put down the polythene .brc and boxing by myself sharp sand is in the background

20210221_111954_compress80.jpg

If you are going readymix concrete, consider using fibremesh concrete instead of welded wire fabric (BRC) reinforced concrete. That welded wire fabric is not going to end up in the optimal position and will do nothing other than probably rust in the long term and damage the slab.

Ask the readymix concrete supplier for a cost for a 21 Mega Pascal cylinder strength (at 28 days) concrete mix with Adfil Durus fibres at 5kg/m3 and Adfil Fibrin fibres @ 0.91kg/m3 dosage. No need for steel reinforcement if the slab is on grade.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby timelapse » February 24th, 2021, 1:24 pm

If you not parking on that area, Id say you need some steel bars still and some brc.Tie the steel about 18 inches to 20 inches apart in a grid.You'd need some more gravel and cement.You have any labourers? If you working with them, I'd say get 3 of them.can easily be done in a day.By me thats about $500 per labourer if is concrete casting,Venes does charge less ask maxpower.Can be done readymix or not.Depends on your preference. Cost me about 10 k to do an area that size mixing by hand.But thats because the road wasn't good enough for a concrete truck.I have a contact for a reasonable mason if you want
Plenty of ways to cut costs, but readymix will still be cheaper

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby pugboy » February 24th, 2021, 2:13 pm

the fibremesh will work fine for non-car use there and go with 4" thick and 3/4" corrugated straight pieces of rebar.

brc is usually a waste of time because steel is mean as a form of tension reinforcement but the brc is never laid perfectly flat

if you insist on hand mixing then go find out about slump test to check concrete mix

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 3:12 pm

:its intended for parking 2 vehicles

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby timelapse » February 24th, 2021, 4:22 pm

Definitely more rebar and go readymix.unless your road cant take the weight of the truck
jsr wrote::its intended for parking 2 vehicles

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby pugboy » February 24th, 2021, 4:23 pm

forget brc and use rebar and 4”
the steel has to be closer to the bottom of the slab
not in the top half of the slab at all and straight as possible

jsr wrote::its intended for parking 2 vehicles

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 5:57 pm

What can i do with all that sharp sand if i go with readymix? Almost half load remaining

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby carluva » February 24th, 2021, 6:58 pm

OP, since the slab is for parking vehicles, I will recommend as a minimum a 4" thick slab, reinforced with 1/2" corrugated rebar lattice spaced 16" C-C. The mix should be readymix with a minimum compressive strength of 3000 psi.

Anything more as recommended by other posters is great, once budget permits. In fact, for added strength and for minimisation of shrinkage cracks over time, the addition of nylon fibers greatly helps.

If you do not intend to tile the surface over time, I would suggest a power float on the surface to properly seal the concrete and improve longevity. Power floated concrete will tend to be slick so you can broom finish when done floating for added grip and slip resistance. Also, a slight grade of the slab away from the house or towards any nearby drains will also help with runoff or surface water.

For the half load of sharp sand, you can consider grubbing your slab area a little deeper and spread the sharp sand as a sound base and compact the same. After this, spread your polythene and rebar with spacers and pour. Also, sharp sand when mixed with potting soil, manure mix or pure manure makes for an excellent growing medium for plants, especially potted plants, so that is an alternative use for some of the excess as well.

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Re: WTK cost to cast an 18 X 18 concrete floor

Postby jsr » February 24th, 2021, 7:48 pm

OP, since the slab is for parking vehicles, I will recommend as a minimum a 4" thick slab, reinforced with 1/2" corrugated rebar lattice spaced 16" C-C. The mix should be readymix with a minimum compressive strength of 3000 psi.

Anything more as recommended by other posters is great, once budget permits. In fact, for added strength and for minimisation of shrinkage cracks over time, the addition of nylon fibers greatly helps.

If you do not intend to tile the surface over time, I would suggest a power float on the surface to properly seal the concrete and improve longevity. Power floated concrete will tend to be slick so you can broom finish when done floating for added grip and slip resistance. Also, a slight grade of the slab away from the house or towards any nearby drains will also help with runoff or surface water.

For the half load of sharp sand, you can consider grubbing your slab area a little deeper and spread the sharp sand as a sound base and compact the same. After this, spread your polythene and rebar with spacers and pour. Also, sharp sand when mixed with potting soil, manure mix or pure manure makes for an excellent growing medium for plants, especially potted plants, so that is an alternative use for some of the excess as well.

Thanks
I may have to look for other uses for the sharp sand besides a planting mix

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