Contents

- 1 How many bags of concrete does it take to fill a sonotube?
- 2 How deep should Sonotubes be?
- 3 How do you calculate concrete for a round hole?
- 4 How many bags of concrete do I need for a 4×4 post?
- 5 How many 80lb bags of concrete makes a yard?
- 6 Do you need rebar in sonotube?
- 7 Do you leave sonotube in ground?
- 8 How many 60 pound bags of concrete make a yard?
- 9 Should deck posts be set in concrete?
- 10 How many posts do I need for a 12×16 deck?
- 11 How deep should concrete piers be?
- 12 How many bags of concrete do I need for a 10×20 slab?
- 13 How much concrete do I need for a post hole?
- 14 How many 20kg bags of premixed concrete do you need?

## How many bags of concrete does it take to fill a sonotube?

16 cubic feet / 0.6 cubic feet / **per bag** = 27 (80#) **bags of concrete** mix.

## How deep should Sonotubes be?

Brace securely at top, middle and bottom of tube. There is no pour rate restriction below the joint, but you CANNOT pour a full liquid head up to 20 feet when using a “Joined” Finish Free Tube if the joint is below the 20 foot level.

## How do you calculate concrete for a round hole?

The **formula** for the **volume** of a **round hole** is pi r2 x depth. Or 3.14 x radius x radius x depth. The radius is half the width of the **hole**.

## How many bags of concrete do I need for a 4×4 post?

Mix two 50lb bags of concrete with water in a mixing tub or 5-gallon bucket. Add concrete into the hole and around the 4” x 4”. Depending on your climate, let concrete set up for **24 – 48** hours.

## How many 80lb bags of concrete makes a yard?

If you’re using **80lb bags of concrete**, you’ll need 45 **bags** to **make a yard**.

## Do you need rebar in sonotube?

To support a beam for a residential deck, **does** a **Sonotube** pier **need** any **rebar**? A. **We** usually recommend that a minimum of two pieces of #4 **rebar** be placed vertically in an 8-inch-diameter concrete pier supporting a structure. A larger-diameter pier **should** have four or more pieces of vertical **rebar**.

## Do you leave sonotube in ground?

No, it’s not a problem to **leave** the **Sonotube** and its plastic “Square Foot” (like these) in the **ground** forever.

## How many 60 pound bags of concrete make a yard?

60 pound bag yields.**017** cubic yards.

## Should deck posts be set in concrete?

There are several ways to **set deck posts**; we recommend attaching the **posts** to **concrete** footers above the ground. This helps to prevent wooden **posts** from rotting. **Set** footers a minimum of 6” below the frost line for your area to prevent movement during freezing temperatures.

## How many posts do I need for a 12×16 deck?

A standard **deck** will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch **posts**.

## How deep should concrete piers be?

By code, the bottom of a **footing must** be at least 12 inches **deep** and below the local frostline—whichever is **deeper**—and bear on stable, undisturbed soil that is free of organic matter. And the code requires a minimum compressive strength of 2,500 psi for the **concrete**.

## How many bags of concrete do I need for a 10×20 slab?

A 60-pound **bag** yields. 017 cubic yards, and an 80-pound **bag** yields. 022 cubic yards. For a 10 x 10 **slab**, you **would need** 77 60-pound **bags** or 60 80-pound **bags**.

## How much concrete do I need for a post hole?

Most fence **post holes** will need between 1 – 4 bags of **concrete** to securely hold the **post** in place. The best way to determine the size of the **hole** is: Diameter of the **hole** is 3 times the width of the fence **post**. Depth of the **hole** is one-third to half the above ground height of the fence **post**.

## How many 20kg bags of premixed concrete do you need?

For jobs where a stronger rated concrete is needed, youmay consider our High Strength Concrete Mix for your concreting purposes. Yield: One 20kg bag will cover an area of 1.1m2 to a depth of approximately 10mm. Or **108** x 20kg bags equates to one cubic metre of mixed concrete.