Floor Joist Are Usually What Size In Residential Construction

Some newer homes have manufactured i beam shaped joists.

Floor joist are usually what size in residential construction.

While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. While joists can be made from many materials those used for residential construction are usually solid or engineered wood. Types of floor joists the three main types of floor joists used in home construction are solid lumber i joists and open web floor trusses. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home.

Joist span and spacing is set by your local building code. A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. You should also check your local building codes before starting construction and consult a structural engineer in unusual or extreme situations. 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.

In many countries the fabrication and installation of all framing members including joists must meet building code standards. Joists must exhibit the strength to support the anticipated load over a long period of time. Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.