Allotment Gardening Advice Help Chat
Chatting => Design and Construction => Topic started by: noshed on February 06, 2008, 16:02
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I have to build a concrete slab 10'x8'2", 3-4" thick. How do I calculate how many bags of cement, gravel whatever to buy. (It's for the base for our famed allotment trading hut, which is now becoming a reality).
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think I googled for the concretecalculator
try this one
http://www.practicaldiy.com/general_building/concrete_calculators/concrete_calculator_2_m.php#paving
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As a quantity surveyor this is my dream question, sad I know;
you'll need total of 0.66m3 concrete (for slab 3.5inches thick), the amount of bags of material you will need depends on the mix you want; coarse, fine etc.
I'm sure the builders merchant or the info on the bag will tell you how many you need to make up the quant with the mix you require :wink: Hope that helps
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Ruth, it sort of shows you've been waiting since the 5th Oct 2007 for that one to come up :lol:
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OHHH YESSSSSSSSSS :lol: :lol: :lol:
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As a retired Quantity Surveyor, the above estimate is correct if the concrete is being spread on a dpm or sand/etc. fully blinded hardcore base, but more would be required if poured onto an open hardcore base.
I always used the guides in the front of commercial pricing handbooks , such as 'Spons' & 'Laxtons' from the office library, rather than info. from builders merchants.
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think I googled for the concretecalculator
try this one
http://www.practicaldiy.com/general_building/concrete_calculators/concrete_calculator_2_m.php#paving
I used this site for material calcs when I laid some strip foundations recently and it was pretty accurate. I've got 2 bags of ballast left over.
Best of luck with the slab.
Rob
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Thanks chaps, much appreciated
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I think my head has just exploded. The shed co reckon a base 305x247cm, say 10cm deep = 753350cm3 = .75m3?
My decimal points may have gone awry.
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This seems to need 8 50kg bags of cement and a cubic meter of ballast - any idea how much this would cost (very roughly). Sorry about this I have to speak to some old Italians tomorrow.
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Using Wickes prices it's about £3/bag for a bulk order of 25kg bags.
Might get a better deal delivered from a builders merchant.
Jumbo bag of ballast which is, I think, about 700 or 800kgs about £35-£40 delivered.
Might be worth hiring a small mixer for the day/weekend.
Speeds the job up no end.
Best of luck.
Rob
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Excellent, thanks a lot
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I think my head has just exploded. The shed co reckon a base 305x247cm, say 10cm deep = 753350cm3 = .75m3?
My decimal points may have gone awry.
Ten foot is more or less 3 metres (3050mm more precisely) and 8 foot is more or less 2.5 metres, so that's 7.5 metres squared. Four inches is 100mm (ie a tenth of a metre) so the answer is 7.5 times 1/10 = 0.75 cubic metres.
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I am a mathematical genius after all. thanks
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It has all gone well - £66! And a lovely flat thingy
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Well done !!
Now you're an expert you can come and re-lay my drive !
:) :wink:
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The shed arrived this morning. May be pics by the weekend
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The joint Italian-Turkish-East End building team have now put the shed up but not the doors apparently. Won't be able to see it until the weekend though.
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Here(http://i241.photobucket.com/albums/ff100/noshed/100_2170.jpg) it is...
Much multi-lingual swearing went into this - and that was only the instructions
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That's a beautiful sight....the shed, not the team.
Our local kebab shop owner taught me some Turkish swear words but I've forgotten them all now.
Give them a hearty pat on the back. You must be very proud ! :D
From noshed to oneshed.
Rob