To fill a 10-inch diameter sonotube that is 4 feet deep, you'll need to calculate the volume of the tube. The formula for the volume of a cylinder is V = πr²h. The radius is 5 inches (0.417 feet), so the volume is approximately 0.544 cubic feet. A typical bag of concrete (60 lbs) yields about 0.45 cubic feet, meaning you'll need about 1.2 bags of concrete to fill the sonotube completely. Therefore, you should plan on purchasing 2 bags to ensure you have enough material.
50lb bags 3.7 60lb bags 3.1 80lb bags 2.3 90lb bags 2.1 These amounts are for using the redi-mix bags.
To many!
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
I use one bag to 1 1/2 bags per hole and fill the rest of the way back with tamped topsoil... whatever came out of the hole.
You will need 0.56 cubic yards of concrete.
50lb bags 3.7 60lb bags 3.1 80lb bags 2.3 90lb bags 2.1 These amounts are for using the redi-mix bags.
There is no way to answer that without knowing how deep the concrete will be.
To many!
The number of bags of concrete needed for setting a fence post depends on the size and depth of the hole. Typically, one bag of concrete is enough for a 4-inch diameter post hole that is 2 feet deep. For larger or deeper holes, you may need more bags of concrete. It is recommended to consult a professional or follow the instructions on the concrete packaging for specific guidance.
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
9.72 Cubic Yards of Concrete is required, if you are going to order by cement truck. 874.8 bags of 40# (40 lbs) bags, or 583.2 bags of 60# 437.4 bags of 80#
I use one bag to 1 1/2 bags per hole and fill the rest of the way back with tamped topsoil... whatever came out of the hole.
Your patio is (8x8)/6in = 10.66 cubic foot. The sand comes in 50 lb bags that cover 0.5 cubic foot so you will need 21.33 bags (round up to 22 or down to 21)
4.4 bags for each 1-foot deep. 2.2 bags for each 6-inches deep. Each 5-ft3 bag will cover the area to 2.72 inches deep.
You will need 0.56 cubic yards of concrete.
How deep do you want the concrete to be?
96 cubic feet of concrete