Do You Need Rim Joists With Floor Trusses

Since the rim joist is on its edge the builder uses an angled nailing technique to attach the bottom of the joist to the first floor wall plate.

Do you need rim joists with floor trusses.

The third step is attaching the floor joists to the rim joists again generally spaced at 16 inches on center. Floor joists once the rim joist is in place which creates a frame around the perimeter of the second story floor you ll install the floor joists which are the same dimension as the rim joist. Most often floor joists need to be sistered because of two problems either water damage which leads to rot or termite damage that crumbled the joist. Triforce experts are regularly invited as speakers for continuing education webinars one participant recently asked if open web floor joists still require rim board.

The place where you ll be most tempted to create oversize holes and notches under the bathtub is the part of a floor you can least afford to weaken. If there was water damage make sure that whatever leaky pipe or condensation issue caused the rot is fixed. The floor joists attach to the rim joist in even spacing. If you need to cut through a joist firm up the floor as shown in fig.

The framer uses a tape measure to make sure these are installed properly. Toe nailing is accomplished by nailing through the face of the rim board diagonally. When the rim board is in place you can manually drive a few nails into the wood i beam joists to hold it in place. We chose 2 in thick r 10 extruded polystyrene don t use expanded polystyrene which is a less effective air and moisture barrier.

I thought that was an interesting question because once you understand everything rim board does you adopt it. The rim joist should be toe nailed into the top plate below using the appropriate nail size likely 12d or 16d nails depending on the material. You can insulate second floor rim joists following the same steps shown here if you happen to tear out a ceiling during remodeling. These problems must be addressed firsthand prior to implementing any restoration steps.

When needed beams or load bearing framed walls are added to help the lumber span large distances that will need additional support to meet code. A cast iron tub with water and occupant can weigh in at more than 800 lbs. Rigid foam is the best insulation for rim joists.