What Does A Rim Joist Do. A deck rim joist is an important structural member and provides support when attaching railing posts or stairs. Rim joists are not to be confused with end joists which are the first and last joists at the ends of a row of joists that make up a floor or deck frame.
The rim joist additionally covers the ends of the joists to cap off the joist cavities the open areas between the joists. This project will help lower your heating costs and save you money. As seen in the photos below pull and mark the joist layout on the inside face of the rim joist and then extend the layout lines down the rim joists face and over the top.
Also known as band joists rim joists are pieces of lumbereither sawn lumber or engineered lumberthat are installed vertically above the mudsill.
The main function of the rim joist here is to keep the joists aligned. When it comes to framing a home or building joists are an integral aspect of carpentry because they distribute the weight of the building evenly across the entire expansion. A deck rim joist is an important structural member and provides support when attaching railing posts or stairs. Rim joists help keep floor joists level and upright.
