# What size concrete piers do I need?

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For sizing pier diameters for small foundations, the rule of thumb is “1 inch per foot of span.” Thus, a deck that spans 8 ft. will stand comfortably on 8-in. -diameter piers, while a deck that spans 10 ft. requires 10-in. -diameter piers.

Available in 6″, 8″, 10″ and 12″ diameters in standard lengths of 4′. Sonotube® Tube Base® footing forms are used in conjunction with Sonotube concrete forms for added strength, increased stability and greater bearing capacity.

Beside this, 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.

Likewise, How do I know what size sonotube to get?

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.

Also, How do you calculate concrete piers?

To determine the load of a deck pier, you must take half the length of the joist span multiplied by half the length of the beam span (measured from pier to pier). This number is then multiplied by 50, which is the 40 psf live load, 10 psf dead load mentioned earlier.

What sizes does sonotube come in?

Available in 6″, 8″, 10″ and 12″ diameters in standard lengths of 4′. Sonotube® Tube Base® footing forms are used in conjunction with Sonotube concrete forms for added strength, increased stability and greater bearing capacity.

## 17 Related Question Answers Found

### How deep should concrete piers be?

Thickness. The minimum thickness for a pier is 8 inches. The minimum thickness for pier footings is 8 inches or 1-1/2 times the length of the footing projection from the pier, whichever is greater.

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### What size sonotube for a deck?

A good size for a common backyard deck is a 10″ or 12″ diameter for the sonotube and a 20″ base diameter. Of course, you can get a 24″ base size and it will spread weight over an even greater surface area.

3-5 feet

### How deep should footings be for a shed?

A concrete footing should be 100mm deep by 300mm wide if the footing is for a free standing wall. The footing should be increased to 150mm deep and 450mm wide if the wall being built is a retaining wall.

### How deep should a concrete base be for a shed?

4-Inch Slab Is Good for Most Sheds A 4-inch slab is generally a good thickness for a typical shed. This concrete floor can be poured in most locales on a 4-inch base of compacted gravel. That requires an excavation of at least 6 inches to make a slab that will be 2 inches above the surrounding ground.

### How many foundation piers are needed?

How Many Interior Piers Are Needed To Make A Structure Even: The number of pilings you’ll require depends on how unlevel your slab foundation is. You may only need 1-2 interior piers, or you may require 10-15, and possibly even more.

### How deep should a column footing be?

A guideline for the depth is 12 inches, plus one additional inch for every three inches of the column. For example, the footing for a six-inch column should be at least 14 inches deep. More is always better.

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

To calculate how much concrete you need, you need to know the post size you are going to use and how many posts you are installing. Your post diameter and height determine how big each hole needs to be. As stated above, fence post holes should be 3 times the diameter of your post and 1⁄3 as deep as your post.

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### How many piers do I need?

An 8 ft x 12 ft shed will need 6 piers, 3 per long side. Typically, the span between two piers is based on the dimensions of the beams and the joists. A double 2×8 beam should be supported every 4 to 6 feet.

10″

### How do you calculate footings?

– Determine the width and length of the cement slab in inches.
– Divide the width by 12 to convert it to feet. …
– Divide the length by 12 to convert it to feet. …
– Determine the depth or thickness that is required for the footing in inches. …
– Multiply the width by the length and then by the depth.

### Can you pour a 2 inch concrete slab?

A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. … Four inches is most common for a slab. The thinner applications would include drives, walkways, slabs and footers, just to name a few.

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