Basic Floor Joist System

I joists have major advantages in high volume construction with standard layouts.

Basic floor joist system.

A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. 69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter. Rather the reader is referred to the aisi standard for cold formed steel framing prescriptive method for one and two family dwellings aisi 2001 for guidance. They wrap around the joists.

Subflooring is usually plywood. Joists are the horizontal members of the floor. The three main types of floor joists used in home construction are solid lumber i joists and open web floor trusses. This is because they are.

True floor joist span calculations can only be made by a structural engineer or contractor. Wood i joists with dimension lumber top and bottom chords and osb web. Sits on top of sill plate. Two types of engineered joists are most frequently used in floor systems today.

Tji joists are lightweight and come in long lengths which makes them faster and easier to install than traditional framing and saves you both. Framing a floor using i joists. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. Used to combat shear forces provides safe work environment and provides nail able surface for the finish floor.

Open web trusses with wood webbing held together with metal plates. Some newer homes have manufactured i beam shaped joists. Joist spans and spacing are determined by engineering that is published by the manufacturer. Header band joists connect the joists together.

Joists run perpendicular to the beam with a center point resting on the support. This article teaches you how to build a floor for a house on a concrete foundation. These include the subfloor joists and beam. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home.

Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s. This framing system can also be used for framing storage shed floors this floor framing system is typical over basements and crawl spaces. Like studs spaced out at equal distances. The beam provides added strength at the middle point and spans the distance between the two sides of the floor.

Trus joist tji joists are a key part of making a high performance floor. Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here. The dimensional stability of tji joists help them resist warping twisting and shrinking that can lead to squeaky floors.