What is a deck rim joist?

Asked By: Zahya Oms | Last Updated: 1st July, 2020
Category: business and finance construction industry
4.3/5 (61 Views . 34 Votes)
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.

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Similarly one may ask, how do you attach rim joists to a deck?

Once all of the joists, and rim joists, are cut and measured to length, attach one end of the rim joist to the ledger with a joist hanger. The rim joists should be about 1 ½ shorter than the front to back measurement of the deck. Use a nail to temporary attach the rim joist to the beam.

Subsequently, question is, do rim joists need to be doubled? 5 that says the RIM joist has to be doubled. The reason for doubling up a regular, non-rim joist under a bearing partition is obviously to carry the bearing load, but a rim joist doesn''t span any distance, only transfer the load directly to the plate. No doubling of rim joists is required anywhere I''ve been.

Also know, are rim joists load bearing?

The main job of a rim joist, also called a band joist, is to provide lateral support for the joists, to prevent the joists from leaning under the weight of the load-bearing walls resting on them. The rim joist also covers the ends of the joists to cap off the joist cavities, the open spaces between the joists.

How do you nail a rim joist?

Whether the plans call for blocking or a rim joist, nailing the joists to the sill plate is the first step.

  1. Align one edge of a standing joist with the appropriate layout mark on the sill plate.
  2. Start an 8-penny nail as a toenail, 1 inch from the end of the joist and 1 inch from the bottom of the joist.

34 Related Question Answers Found

How far can a deck overhang the beam?

According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. This means that joists, such as southern pine 2x10s at 16 inches on-center, spanning 12 feet are allowed to cantilever up to an additional 3 feet (see illustration, below).

What is the purpose of a rim joist?

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. A rim joist's relationship to the joists is similar to what the top or bottom wall plate is to the studs.

Can I use a 6x6 as a deck beam?

Triple beams for decks (3-2x's) should be supported with 6x6 posts using a post beam connector bracket. 4x4 posts will not provide adequate bearing for a triple beam. Do not notch the top of the post and through bolt the beam because the width of the triple beam will limit the notched section of the post down to 1".

How do you reinforce deck joists?

Cut a reinforcing joist from pressure-treated lumber. Treat all sides of the reinforcing joist with a clear sealer and let it dry. Position the reinforcing joist tightly against the damaged joist, and attach it with 16d (3.5") galvanized nails driven every two feet or fasten it with 3 1/2-inch galvanized deck screws.

How do you level deck joists?


  1. Check the installed beams and ledger boards on which you'll set the joist.
  2. Crouch down so you're eye level with the ledger board and beams, and look at the top edge.
  3. Don safety gear.
  4. Lay out one joist on the far right and far left of the deck; the outside joist should be as straight as possible.

How big is a rim joist?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet.

What screws to use for decking joists?

Most decking screws are 8-gauge and, while 2 1/2 inches is the minimum length needed to hold decking boards to the joists, 3-inch screws are commonly used to provide extra holding power against the upward pressure of shrinking or warping boards. Specialty decking materials have different requirements.

Does insulating rim joist help?

In just a couple of hours, you can seal and insulate your rim joists, which are major sources of heat loss in many homes. This project will help lower your heating costs and save you money. Insulating the rim joists is one of the best things you can do to make your home more energy efficient.

What is the space between floor joists called?

Normally, floor joists are spaced 16 inches apart on center. This means from the center of one upright joist to the center of the next. Given that 2x8s are actually 1-¾ inches wide, it works out to be 14-¼ inches between each joist. With some structures, floor joists are required to be 12 or 24 inches apart on center.

What do floor joist sit on?


Floor joists, spaced on regular intervals, span the areas between supports such as walls, foundations, girders, and beams. Normal spacing is 16 inches “on center" (from center to center), though some floors may have joists on 12-inch or 24-inch centers.

How much does it cost to fix a sill plate?

Foundation / Basement / Structural
1. Add fill dirt/regrade @ foundation $500 & up
16. Repair/replace rotted or damaged joist $100 - $250 ea.
17 Repair/replace rotted or damaged sill plate $75 - $100 plf & up
18. Underpin corner of building $1,100 – $1,300 ea.
19. Underpin/replace foundation $500 plf & up

What is a sill joist?

Band Joist and Sill Plate – Defined. The band joist and sill plate are the set of boards (in wood frame houses), or blocks (in a brick house) that sit on top of the foundation wall and run in a band around the house. Great video explaing band / sill and why you need to air seal this area.

How do rim joists attach to top plate?

The answer ultimately depends upon your local climate/weather (heavy wind loading?), but generally the way to handle that situation is to span the joists at the top plate with a "rim joist", then toenail all the joists to the top plate.

What is a double joist?

Double floor joists are two joists side by side that are usually nailed or screwed together along the length.

What is a deck band?


Band/Rim Joist: Band joists, also sometimes called rim joists, are just joists at either the side or end of the deck. There's nothing special about them. In fact, unless you've got stairs attached to one of them, band/rim joists only have to carry a fraction of the load that the regular floor joists do.

What is a band joist in construction?

Band Joist Insulation. The outside ends of these joists and the space between them are covered with a band joist or "header." This band joist is usually the same size as the floor joists and runs around the entire perimeter of the building.

How many nails are in a 2x10?

A 2x10 Beam should use a minimum of (4) - 3” nails fastened in a vertical pattern from both sides of the beam every 16” on center.