## How do you calculate lumber for a porch?

The first step for answering “how to calculate how much decking I need” is to determine your deck’s square footage, or area, by taking the length of your deck times the width (L x W). EXAMPLE: For a deck that is 16 feet long and 12 feet wide, multiply 16 by 12. This gives you 192 square feet, your deck’s total area.

### What do I need to build a 12×12 porch?

For example, a 12-foot x 12-foot deck of 5/4 x 6 pressure treated wood decking on 16 inches on center spacing of joists will require: A 12-foot long deck with joists 16 inches on center will require 10 joists. 20 fasteners x 26 (number of rows of decking) = 520 fasteners. Add 10 percent to be safe.

**What materials do I need to build a 12×16 deck?**

Your deck can be built with cedar or redwood, ipe or jarrah woods, as well as pressure-treated pine or fir. Composite materials, such as vinyl, are also an option.

**How much does it cost to build a 20×20 deck?**

The average homeowner spends $2,200 to build a 10×10 foot deck, $6,160 to build a 14×20 deck, and $8,800 to build a 20×20 deck. The cost to build a deck with pressure-treated wood, hardwood, or composite is about $25 per square foot, for both materials and installation.

## How much material do I need to build a 12×12 deck?

A 12 -by-12-foot deck will need 144 lineal feet of decking.

### How much does it cost to build a 16×20 deck?

On average, you can expect to pay about $20,000 for a 16 x 20 foot composite board deck.

**How much does it cost to build a 12×12 porch?**

A 12 x12 deck can range in cost from $2 200 to $13 000, but the average will be $6 000. Costing $40 a square foot but can be as little as $15 or as high as $85, depending on the deck’s features.

**How much do porches cost?**

Average Cost to Build a Porch by Type

Covered Porch | $4,600 – $22,000 |
---|---|

Front Porch | $1,900 – $8,800 |

Back Porch | $1,900 – $5,300 |

Wrap-Around Porch | $9,350 – $39,900 |

Farmers Porch | $7,900 – $52,000 |

## What material do I need for a 12×12 deck?

You will need 18 boards of 2-by-6-inch lumber or nine 2-by-10 inch boards to build the joists, also known as the beams. You should purchase an additional 25 percent wood to allow for framing pieces and waste.

### How do I calculate deck boards?

How Many Deck Boards Do I Need?

- Size of your deck, which can be determined in either: Total square footage. Length x Width in feet and inches (total length of your deck’s perimeter)
- Board size.
- The angle of your decking. 90° to the joist (giving a horizontal, straight-across look)

**What is the cheapest material to build a deck?**

Pressure-treated wood

Pressure-treated wood is generally the cheapest material to build decks from.

**How many 2×6 Do I need to build a 12×12 deck?**