![]() In the case of a floor joist, it is acting as a single girder and provides support to the floor above it. Girders are very strong, and are used to provide support over an unsupported span, like a bridge. Most people will think of a girder as a long piece of steel used to build skyscrapers. When you sister a joist, you are in effect building a double girder. To install a sister joist, you will make another joist exactly like the one in the floor and attach it with nails, screws, or bolts. If your floor joist measures 2” by 8” (approximately), you have 2” x 8” floor joist. For example, let’s say your joist is in the floor, making it a floor joist. What Does Sistering a Joist Mean?įor lack of a better analogy, you can think of sister joist as an identical, conjoined sister. Today we will discuss how a joist should be sistered using typical code requirements and general engineering principles as a guide. Most building codes, including the most used, the IRC, do not directly address sistering a joist, but they do address girders, which are similar. ![]() Sistering a joist describes adding another identical joist like a sandwich, which doubles the thickness of the joist.
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