# What Is Floor Joists | 3 Types of Floor Joists | Floor Joist Spacing | Standard Floor Joist Size | Best Floor Joist Types

## What Is A Floor Joist?

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A Floor Joist is a timber beam that is perpendicular to the beam and parallel to the walls for providing a supportive framework for flooring.

This Floor Joist is play a very vital role in the subfloor structure, because they carry the dead load of the furniture, flooring load, vibration of people walking and impact load, etc.

For floor joists used high-quality timber which is help to give durability, evenness of floor, and strength.

This joist must be closely spaced and fixed in nature so that it sufficiently takes all loads like live load, dead load, impact load, and sagging of flooring, prevent bending, etc.

Floor Joist load capacities depend upon the following factors,

• Grade of timber or lumber.
• Species of Wood.
• Length of the joist span.
• The load was placed on the floor.
• Width of Timber Boards
• The thickness of Timber Boards.

Read More: Mezzanine Floors | Types of Mezzanine Floors | Mezzanine Flooring

## Floor Joist Spacing

Mostly, floor joist spacing is kept between 12″ to 24″ Inches apart from the center, but it depends on the size of the floor joist timber size, building codes, and requirements of the design.

The following table shows the standard floor joist spacing with different sizes.

## Calculation of Joist Size

For example, if you had a floor in a room that spans 16 feet, you would divide the room span and get 8 feet, and then ass two means 10.

That means you need a depth of joist that will be 10 inches.

The Standard Size of floor joists is 2×8, 2×10, and 2×12.

## Types of Floor Joists

Here most commonly used types of floor joists are given below,

• I Shaped Floor Joist:
• Solid Lumber
• Open Web Floor Joist

### I Shaped Joist

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I-Shaped floor joist is an engineering type wood joist, also it is known as a TJI Joist because they look like the capital letter I.

Different parts of the joist are made of different materials like Top and bottom parts of the joist are made with a laminated veneer or wood and the center part is made with an oriented strand board (OSB) or plywood.

Those have a long span and eco friendly in nature and carry higher loads than solid timber.

Another side joists cannot resist fire or water.

• This is having a longer span than solid wood joists.
• These joists are easy to place.

• I-Joists are failing quickly during the fire accident.
• These joists are costly.

### Solid Lumber Joist

Solid Lumber Joists are made up of old-growth trees and solid timber.

The cost of solid lumber joists depends on the various factor,

• Size of Boards.
• Quality of Wood.
• Life Span of Wood.

#### Advantages of Solid lumber joists

• It last longer during a Fire.
• It is less expensive as compared to engineer-type wood.

#### Disadvantages of Solid lumber Joists

• It is not environmentally friendly.
• It is designed for a Shorter Span.

### Open-Web Floor Trusses Joist

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If you are looking for a joist that offers a range of various longer spans, ranges of depth, and Load carrying capacity then go for this open web floor type.

Wood Trusses are a having a low moisture capacity and shrink less.

#### Advantages of Open web Floor Truss

• These joists are suitable for a longer span.
• These joists accommodate the passing plumbing, electrical, and water supply line without cutting.

#### Disadvantages of Open web Floor Truss

• This is Costly as compared to I-Joists.
• These joists are difficult to Trimmed.

Read More: What Is Flooring | 10 Types of Flooring | Best Flooring for House In India

The following advantages of Floor Joists are Common, which are not dependent upon the type of joist,

• Floor Joists are vertical members and work as a beam transferring a load to the ground.
• The Floor joists support the structure.
• Floor Joists are sufficient to carry the weight of whole new floors.
• The installation process of floor joists is affordable.

The following Disadvantages of Floor Joists are Common, which are not dependent upon the type of joist,

• Floor Joists are not suitable for large areas.
• Floor Joists are not placed without the support of walls, columns, and beams.
• Floor Joists have more weight as compared to other trusses.
• Floor joists have a limitation in design and model.

Read More: 28 Tiling Tools Used In Flooring Work | Tools for Tiling | Tools For Tile Work

## FAQs:

### What is a Floor Joist?

A Floor Joist is a timber beam that is perpendicular to the beam and parallel to the walls for providing a supportive framework for flooring.
This Floor Joist is play a very vital role in the subfloor structure, because they carry the dead load of the furniture, flooring load, vibration of people walking and impact load, etc.

### What are the types of Floor Joists?

Here most commonly used types of floor joists are given below,
I Shaped Floor Joist
Solid Lumber
Open Web Floor Joist

### What are the advantages of Floor Joist?

Floor Joists are vertical members and work as a beam that transfers a load to the ground.
The Floor joists support the structure.
Floor Joists are sufficient to carry the weight of whole new floors.
The installation process of the floor joist is affordable.

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