How many square yards in a 20x18 feet 3 inches thick
4.074 cubic yards for every foot the slab is thick.
1 cubic yard = 27 cubic feet700 square feet x 1/2 foot = 350 cubic feet = 1226/27 cubic yards(12.963 cubic yards, rounded)
Total coverage area 314.16 sq. feet. depth of 2 inches = 1.94 cu yards answer ... around 2 cu yards
Our area is 250 ft2 so 250 ft3 would cover the area with cement a foot deep. We only need 3 inches (1/4 of a foot) so we divide 250ft3 by 4 to get our answer: 62.5 cubic feet.However, the question asks for "yards of concrete" so we need to convert cubic feet into cubic yards as follows:One cubic yard = 3ft x 3ft x 3ft = 27 ft3Dividing our cubic foot answer of 62.5 by 27 we get our answer in cubic yards:62.5/27 =2.3148148 yd3 (the 148 repeats)
15 yards 1 foot 6 inches is the same as 14 yards 3 feet 18 inches. If you subtract 4 yards 2 feet 8 inches from that measure, you get 10 yards, 1 foot, 10 inches.
18x32 feet by 4 inches thick: 7.1 cubic yards. For a 6-inch slab, 10.7 cubic yards.
A 9x9 foot slab 4 inches thick requires a minimum of 1 cubic yard. If you go to 6 inches thick you will need 1.5 cubic yards.
4.074 cubic yards for every foot the slab is thick.
A minimum of 1.3 cubic yards.
It depends on the concrete company you're working with. You need 33 yards of concrete. Concrete companies deliver the stuff in full truckloads - and no, this is NOT a job for Sakrete. If you can find a company that has Oshkosh front-load mixers, you'll need three truckloads because those trucks hold 11 yards. If you can only find companies with rear-load mixers, you need 36 yards because a rear-load mixer holds 6 yards of concrete.
18 inches
Is the concrete filled with pebble or lightweight foam? This is really an impossible question. Not enough data.
1 cubic yard = 27 cubic feet700 square feet x 1/2 foot = 350 cubic feet = 1226/27 cubic yards(12.963 cubic yards, rounded)
A 12 foot by 12 foot slab would be 3.5 inches thick. It would total 1.555555 yards mathematically. It is recommended to add 5% error to the mix and round up to the nearest half yard. If you order this then order 2 yards and expect overage.
You will need a minimum of 2.42 cubic yards of cement.
A cubic foot is 12" thick 12" wide and 12" deep. .45 cubic feet per 60# bag of concrete
10.00 dollars per square foot plus permit cost.