Enter the number of bricks (8" x 2" x 4") or blocks (8" x 8" x16") in the box below that you plan to use for your project. bag would cover an area approx. Enter the number of bricks or blocks below to calculate how many bags of mortar will be needed, or how much materials will be needed to mix on-site. How many 80lb bags of concrete for so many cubic yards of concrete. (based on 50lbs bag) Mesh Mosaics: Mesh Mosaics: 3/16 inch V-Notch: 90 - 100 Sq Ft: 4 inch - 12 inch Tile ... 1/2 inch Square or V-Notch: 40 - 50 Sq Ft: Cement Board Installation : 1/4 inch Square: 75 - 85 Sq Ft . ... How many 80lb bags of concrete needed for a slab. Sq Ft COVERAGE (based on 25lb sanded) Ceramic Mosaic RECOMMENDED SPACING . Cubic Feet of Concrete in a 40lb bag. Unit volume: 0.444 cubic yards (12 ft 3): Total volume: 0.444 cubic yards (12 ft 3): Concrete needed: 0.80 tons (1,596 lbs) Concrete needed (bags) 19.95 bags of 80 lbs each, or 26.59 bags of 60 lbs each, or 39.89 bags of 40 lbs each Assuming the mix ratio of the floor is 1:3:6 and the thickness of the floor is 150mm (1m by 1m by 0.15m). The yield of most concrete mix is roughly 0.15 cubic feet for every 20 pounds of mix. bag contains less than 1/2 a sq. ft. This is the bag’s “yield,” and this number will act as the proper coverage for your home project. That's only approx 6 cubic ft. That would only cover an area 6' x 12' x 1" The calculator will then tell you the number of bags you need based on the different size of bags we carry. The coverage should be written somewhere on the front or back of the bag. Cubic Feet of Concrete in a 60lb bag. If you are talking about ready-mix (the kind you only add water to), a bag will cover 2 sq ft at 4" depth (1' x 2' x 4"). So, use 10 bags to help secure the backerboard down to the subfloor, with the screws. If using the standard 1:2:3 proportion of cement to sand to gravel, each 94-pound bag of cement can be used for 6 cubic feet of concrete. Your 1' x 1' x 6" example equals 1/2 cubic foot. On a standard bag of concrete, you will find the cubic feet the bag will fill. You omitted the thickness of the floor. Sanded. Cubic Feet of Concrete in a 80lb bag. Calculated results will reflect how many bags are needed for Block and Brick. A 50 lb. You didn't state the mix ratio of the concrete; 2. Cubic Yards of Concrete in a Circular Slab. Per Sakrete a 50# bag will contain 1/2 cubic foot of concrete. A 4’ by 8’ pour at 4” thick will require 10-2/3 cubic feet of concrete… The amount of Portland cement necessary will depend on the mix design you use. The guy could easy use 12 1/2 bags. Using 60# bags it would take 50/60 x 1 = 0.833 bags Answer: One 50# bag per 1' x 1' x 6" area. 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