The number of footings you need for a deck depends on various factors, including the size of the deck, the type of soil, and local building codes. Generally, you will need a footing for each corner of the deck and additional footings along the perimeter and under support beams. Here’s a general guideline for the number of footing:

For a 10×10 deck, you would typically need 4 corner footings and additional footings along the perimeter, usually spaced about 6 to 8 feet apart.

For a 12×12 deck, you would also start with 4 corner footings and add more along the perimeter, typically spaced about 6 to 8 feet apart.

For a 16×20 deck, you would need 4 corner footings and additional footings along the perimeter and under support beams, spaced about 6 to 8 feet apart.

For a 16×16 deck, the footing requirements would be similar to the 16×20 deck, with 4 corner footings and additional footings along the perimeter and under support beams.

Deck is the outdoor construction. It may be attached to your house, or floating deck in your yard. It is good looking and increases the aesthetic space and beauty of your house. Adding a deck to a house or yard is a great way to create an outdoor living space. Building a deck requires plenty of planning as well as the right materials footings joists, posts, footing, subfloor, and methods, but it’s worth the effort.

One of the common and most important structure required is footings for deck that transfer all incoming loads from subfloor to soil. How many footings do i need for my deck will depend on size and shape of your deck, local building code, size of beams, distance between two post, loads of subfloor, attached or floating deck and design of your deck.

Deck footing are many types as concrete deck footing which are very much popular that can be easily made by using Sonotubes concrete. You can also use reinforcement bars or rebar to increase the tensile strength. Another second choice is use of precast concrete deck blocks or piers. It comes in standard size.

There are many factors that affect the number of footings you will need. The size or dimensions of your deck is most important factors. The bigger size of your deck will require more footings while smaller require fewer footings. Another factors is size of beam and shape of your deck. If you have square deck, you can make easily lay- out. Number of footings also depends on floating and attached footings.

A floating deck is a structure that is not attached to your house or another existing building. It is self-supporting structure and are not connected to your home’s existing foundation. This will require more footings for design structure. An attached deck is connected to some existing structure, such as your house, garage, or other building which will require fewer footings.

Size of posts which are used for deck is 4×4, or 6×6. If you use 4 inches by 4 inches posts, you will need more posts while using 6″×6″ will require fewer number of posts. Diameter of footing should be range between 8 to 24 inches for round footing. Most builders use 12-inch round footing. If you use square footing, then best size are 16″×16″ as well as 18″×18″ and 20″×20″.

What will be best distance between two footings for my deck. Even if your deck is simple, footing should be always placed at a distance of not more than 8 foot center to center apart. More load on subfloor and other heavy objects will require additional footing and larger deck beams. After completing the design of the deck, you can calculate how many footings you will need.

**How to figure how many footings do i need**

To figure the number of footings you will need for any deck, count the footings that installed at each of the corners, and a line footings needs to be placed between each pair of corner footings at distance less than an 8 foot apart. That makes a total of 8 footings that need to be installed on this average size deck and plus atleast 2 footings more if you are planning on building stairs.

How many deck footings do I need for our deck will depend on size and shape your deck, size of posts, floating deck, attached deck, size of beams. The larger the beam and posts size, the fewer footings are required.

**How many footings do i need for a 8×12 deck**

If your floating deck is 8×12 foot with footings which spaced 4 feet apart in shorter side (8-foot side) and 6 feet apart in longer side (12-foot side) on center will require 8 footings, plus at least 2 footings more if you are planning on building stairs. The attached 8’×12′ deck will need 3 footings plus at least 2 more for stairs.

A deck that is 8×12 or 8′ by 12′ will need a footing installed at each of the corners. This makes total 4 footings placed at corner. The shorter side the 8-foot side—will have 4-feet of distance between deck footing. The larger 12-foot side will have a footing spacing of 6 feet at a minimum code requirement. This makes total 4 footings placed at line side. Add both figure that makes a total of eight footings that need to be installed on 8×12 size deck.

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**How many footing do i need for a 10×10 deck**

If your floating deck is 10×10 foot with footings which spaced 5 feet apart each side on center will require 8 footings, plus at least 2 footings more if you are planning on building stairs. The attached 10’×10′ deck will need 3 footings plus at least 2 more for stairs.

A deck that is 10×10 or 10′ by 10′ will need a footing installed at each of the corners. This makes total 4 footings placed at corner. The each side the 10-foot side—will have 5-feet of distance between deck footing. This makes total 4 footings placed at line post. Add both figure that makes a total of eight footings that need to be installed on 10×10 size deck.

**How many footings do i need for a 12×16 deck**

If your floating deck is 12×16 foot with footings which spaced 6 feet apart in shorter side (12-foot side) and 5 or 6 feet apart in longer side (16-foot side) on center will require 10 footings, plus at least 2 footings more if you are planning on building stairs. The attached 12’×16′ deck will need 4 footings plus at least 2 more for stairs.

**How many footings do i need for a 10×20 deck**

If your floating deck is 10×20 foot with footings which spaced 5 feet apart in shorter side (10-foot side) and 5 feet apart in longer side (20-foot side) on center will require 12 footings, plus at least 2 footings more if you are planning on building stairs. The attached 10’×20′ deck will need 5 footings plus at least 4 more for two stairs.

**How many footings do i need for a 10×12 deck**

If your floating deck is 10×12 foot with footings which spaced 5 feet apart in shorter side (10-foot side) and 6 feet apart in longer side (12-foot side) on center will require 8 footings, plus at least 2 footings more if you are planning on building stairs. The attached 10’×12′ deck will need 3 footings plus at least 2 more for stairs.

**How many footings do i need for a 12×12 deck**

If your floating deck is 12×12 foot with footings which spaced 6 feet apart each side on center will require 8 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 12’×12′ deck will need 3 footings plus atleast 2 more for stairs.

**How many footings do i need for a 16×16 deck**

If your floating deck is 16×16 foot with footings which spaced 4 feet apart each side on center will require 12 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 16’×16′ deck will need 5 footings plus atleast 2 more for stairs.

**How many footings do i need for a 16×20 deck**

If your floating deck is 16×20 foot with footings which spaced 4 feet apart in shorter side (16-foot side) and 5 feet apart in longer side (20-foot side) on center will require 16 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 16’×20′ deck will need 5 footings plus atleast 4 more for two stairs.

**How many footings do i need for a 20×20 deck**

If your floating deck is 20×20 foot with footings which spaced 5 feet apart each side on center will require 16 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 20’×20′ deck will need 5 footings plus atleast 2 more for stairs.

**How many footings do i need for a 12×24 deck**

If your floating deck is 12×24 foot with footings which spaced 6 feet apart in shorter side (12-foot side) and 6 feet apart in longer side (24-foot side) on center will require 12 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 12’×24′ deck will need 5 footings plus atleast 4 more for two stairs.

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**How many footings do i need for a 12×14 deck**

If your floating deck is 12×14 foot with footings which spaced 6 feet apart in shorter side (12-foot side) and 5 feet apart in longer side (14-foot side) on center will require 10 footings, plus atleast 2 footings more if you are planning on building stairs. The attached 12’×14′ deck will need 3 footings plus atleast 4 more for two stairs.

A deck block is precast concrete used for foundation and footing. They’re subject to all of the same requirements as a typical footing, regardless of not being cast-in-place. Space the deck blocks at 4′ to 6′ intervals to offer the frame good support.

**How many deck blocks do i need for a 10×12 deck**

If your floating deck is 10×12 foot with deck blocks which spaced 5 feet apart in shorter side (10-foot side) and 6 feet apart in longer side (12-foot side) on center will require 8 deck blocks, plus atleast 2 deck blocks more if you are planning on building stairs.

**How many deck blocks do i need for a 12×16 deck**

If your floating deck is 12×16 foot with deck blocks which spaced 4 feet apart in shorter side (12-foot side) and 4 feet apart in longer side (16-foot side) on center will require 14 deck blocks, plus atleast 2 deck blocks more if you are planning on building stairs.

**How many deck blocks do i need for a 12×12 deck**

If your floating deck is 12×12 foot with deck blocks which spaced 4 feet apart each side on center will require 12 deck blocks, plus atleast 2 deck blocks more if you are planning on building stairs. The attached 12’×12′ deck will need 4 deck blocks plus atleast 2 more for stairs.

**How many deck blocks do i need for a 10×10 deck**

If your floating deck is 10×10 foot with deck blocks which spaced 5 feet apart each side on center will require 8 deck blocks, plus atleast 2 deck blocks more if you are planning on building stairs. The attached 10’×10′ deck will need 4 deck blocks plus atleast 2 more for stairs.

**How many deck blocks do i need for a 16×16 deck**

If your floating deck is 16×16 foot with deck blocks which spaced 4 feet apart each side on center will require 16 deck blocks, plus atleast 2 deck blocks more if you are planning on building stairs. The attached 16’×16′ deck will need 5 deck blocks plus atleast 2 more for stairs.

**Conclusions:**

If your floating deck is 10×10 foot with footings which spaced 5 feet apart each side on center will require 8 footings, plus atleast 2 footings more if you are planning on building stairs.