Deck Rim Joists
Start the first screw near the top of a middle joist based on the.
Deck rim joists. A 2x8 up to 12 feet. Depending on construction methods the deck could even be constructed without an outside rim joist. 6 02 28 13 03 20 pm. Trim any joists that don t match up to fit.
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. This can be accomplished in a couple of ways. Use a square to extend the layout marks across the face and top of the joist. This style is common and best suited for ones installed near ground level.
2x10 to 15 feet and 2x12 to 18 feet. Building inspectors often cite improper fasteners such as deck screws and ungalvanized nails as a leading deck code violation. Measure and mark the joist layout on the rim joist remembering to indicate which side of the mark the joist will. In this configuration doubled rim joists act as the beams.
Once the joists are in place and the rim joists are attached don t secure the joists to the beams just yet. Joists that are longer or shorter will cause the rim joist to be out of line. You may want to install double rim joists across long sections to respond to the flexibility of the material. The larger the deck the larger the joists.
When installing rim joists use a string stretched between the outside corners of the deck to ensure that the ends of all joists are cut flush with each other in a straight line. In the case where they run parallel to the other floor joists like the one you clicked on in the diagram there s nothing special about them. Reinforcing deck rim band joists. I prefer to double the outside joists as do some deck builders which adds 2 joists for a total of 11.
Install the floor or deck joists directly to the beams and ledger board with hangers rather than sitting them on top of the beams. In the framing of a deck or floor system a rim joist is attached perpendicular to the joists and provides lateral support for the ends of the joists while capping off the end of the floor or deck system. That means these joists can span the 12 foot depth of the deck and the beam can be located at the perimeter. If the deck is built with a cantilever there is nearly no load on the rim joist as the rim joist is actually held up by the floor joists and can easily be nailed on.
This eliminates the width of the beams anywhere from 6 12 inches. However rim joists placed at the ends of the floor joists at the far edge of the deck frequently rest on posts and carry the weight of the deck on that end. It is advisable to increase the rigidity and strength of your deck s rim or perimeter in order to reduce bounce and provide a solid foundation for your rail system. Nine joists will be needed for the 16 foot width.