# How deep should a footer be for a room addition?

Table of Contents

## How deep should a footer be for a room addition?

Depth of Footings Footings should extend to a minimum depth of 12 inches below previously undisturbed soil. Footings also must extend at least 12 inches below the frost line (the depth to which the ground freezes in winter) or must be frost-protected.

## How big do footers need to be?

Footers must be a minimum of 24 inches deep. There must be a minimum of 6 inches of concrete in the footer, 2 story home-8 inches deep. wide).

## How do you create a footer for an addition?

Add a standard or customized header or footer

- Go to Insert > Header or Footer.
- Choose from a list of standard headers or footers, go to the list of Header or Footer options, and select the header or footer that you want.
- When you’re done, select Close Header and Footer or press Esc.

## What is the width of a footing?

The minimum width of footings shall be 12 inches (305 mm).

## How big of an area do I need for footing?

At a minimum, the required footing size is 2’-6” squared or 2’-6”x2’-6” which will yield 6.25 square foot area of footing. Normal weight concrete weighs about 150 pcf (pounds per cubic foot).

## How to calculate the footing size of a post?

You can determine the footing size needed to support the load by using this formula: A = B/C Where A = Surface area of the footing B = Load on the footing in pounds C = Load carrying capacity of the soil in pounds per square foot (psf) Please Note: Because each post is sitting on an individual footing, we use

## How to calculate the footing size of a deck?

If you multiply the area of this section 5’ x 5’, you will get 25 square feet. You can multiply this area by 55 lbs per square foot loading to come up with 1,375 lbs total load. Once you know the total load, you can use the chart below to determine the footing size for your soil conditions.

## How are the dimensions of a concrete footing determined?

These numbers come from assumptions about the weights of building materials and the live and dead loads on roofs and floors. The allowable bearing capacity of the soil under the footing has to equal the load imposed by the structure.

You can determine the footing size needed to support the load by using this formula: A = B/C Where A = Surface area of the footing B = Load on the footing in pounds C = Load carrying capacity of the soil in pounds per square foot (psf) Please Note: Because each post is sitting on an individual footing, we use

At a minimum, the required footing size is 2’-6” squared or 2’-6”x2’-6” which will yield 6.25 square foot area of footing. Normal weight concrete weighs about 150 pcf (pounds per cubic foot).

These numbers come from assumptions about the weights of building materials and the live and dead loads on roofs and floors. The allowable bearing capacity of the soil under the footing has to equal the load imposed by the structure.

## What’s the difference between Footing depth and width?

Footing depth can be confused with the thickness of a footing. Eight inches is the minimum thickness for a footing. Ten inches is better and twelve inches is highly desirable. The depth of the footing in the ground depends on: the local frost depth; how deep you need to go to be in solid strong soil