# Readers ask: How Much Concrete For 12 Sonotube?

## How much concrete is needed for a sonotube?

For example, a sono tube with a 10″ diameter and a 4′ depth requires 0.08 cubic yards of concrete.

## 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 post hole?

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 bags of concrete do I need calculator?

For concrete, the formula for volume is as follows: length x width x thickness. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: 40 pound bag yields.011 cubic yards.

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## 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.

## What size sonotube for a 4×4 post?

What size Sonotube do I need for a 4×4 ” fence post? The rule-of-thumb is to use a tube diameter 3 times the post width, therefore use a 12” diameter Sonotube for a 4×4 ” post.

## 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 many bags of concrete do I need for a 6×6 post?

As I recall, a 60 # bag of concrete is about. 5cf, so you’d need 3 bags per hole.

## How many bags of concrete makes a yard?

On average, it will take 90 40lb bags, 60 60lb bags, or 45 80lb bags to fill one cubic yard of concrete.

## Is 2 feet deep enough for fence posts?

Dig post hole so diameter of the hole is 3 times the width of the post (i.e., the hole for a 4” wood post should be about 12 inches wide). The depth of the hole should be 1/3-1/ 2 the post height above ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet ).

## Should I use concrete for fence posts?

Concrete is the most secure material for setting fence posts, especially if you have sandy soil. Using premixed concrete rather than dry concrete will ensure ultimate security. While concrete is sturdy, it lacks the drainage of gravel and can trap moisture, ultimately leading to rot.

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## Do you need gravel under concrete?

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

## How much does a 25kg bag of concrete cover?

As a rule of thumb 1 of our 25kg bags will cover an area of 0.25m to a recommended depth of 50mm.

## How many 20kg bags of concrete are in a cubic meter?

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.

## How much volume does a bag of concrete make?

bag provides 0.45 cubic feet of cured concrete. A 80 lb. bag provides 0.6 cubic feet of cured concrete. If you have concrete delivered it is sold by the yard (which is a cubic yard = 27 cubic feet).