Floor Joists Spacing

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

What Is A Floor Joists?

A Floor Joist is a timber beam that is perpendicular to the beam and parallel to the walls for providing a supportive framework to 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 Is Floor Joists | 3 Types of Floor Joists | Floor Joist Spacing | Standard Floor Joist Size | Best Floor Joist Types
Floor Joists

For floor joist used high-quality timber which is help to gives 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 the timber or lumber.
  • Species of Wood.
  • Length of the joist span.
  • Load placed on the floor.
  • Width of Timber Boards
  • 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 centre, 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.

12″16″24″
2 x 610 – 109 – 108 – 7
2 x 813 – 1 12 – 411 – 3
2 x 1015 – 314 – 413 – 6
2 x 1217 – 216 – 2 15 – 3

Calculation of Joist Size

For example, if you had a floor in a room that span is 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

What Is Floor Joists | 3 Types of Floor Joists | Floor Joist Spacing | Standard Floor Joist Size | Best Floor Joist Types
I-Shaped Floor Joist

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 of I.

Different parts of the joist are made of different materials like Top and bottom part joist are made with a laminated veneer or wood and the centre 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 be resists fire or water.

Advantages of I-Joists

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

Disadvantages of I-Joists

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

Read More: What Is a Mud Flooring? How to Prepare Mud Floor, Advantages & Disadvantages


Solid Lumber Joist

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

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

Advantage of Solid lumber joists

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

Disadvantages of Solid lumber Joists

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

Open- Web Floor Trusses Joist

What Is Floor Joists | 3 Types of Floor Joists | Floor Joist Spacing | Standard Floor Joist Size | Best Floor Joist Types
Open Web Floor Truss Joist

If you are looking towards a joist that offer a range of various longer span, Range of depth, 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 longer span.
  • These joists are accommodating the passing plumbing, electrical, water supply line without cutting.

Disadvantages of Open web Floor Truss

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

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


Advantages of Floor Joist

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

  • Floor Joists are vertical members and work as a beam so that transferring a load to the ground.
  • The Floor joists are support the structure.
  • Floor Joists are bearing the live load, Dead load and impact load.
  • Floor Joists are sufficient to carry a weight of whole new floors.
  • Installation process of floor joist is an affordable.

Disadvantages of Floor Joist

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

  • A Floor Joists are not suitable for large area.
  • Floor Joists are not placed without support of walls, column and Beam.
  • Floor Joists have a more weight as compare to other truss.
  • 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 the supportive framework to 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 bearing the live load, Dead load, and impact load.
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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