How to Install Romex Wiring in Wood Trusses


A wood truss is a series of wooden triangles which have been assembled into a frame. They are used to build roofs in situations where the roof must span a long distance without any interior support.
When you install wiring in a house, you can do a certain amount of drilling or cutting through wooden joists, studs and plates without compromising their structural integrity, but if you drill or cut trusses you will weaken them and void any manufacturer warranty.

Things You'll Need

  • Heavy-duty stapler
  • 2" by 6" wooden boards
  • 2" by 4" wooden boards
  • Hammer
  • Nails
  • Lay the wiring over the trusses without protection if your attic is not permanently accessible. Run the cables near the truss edge and staple them to the top of a truss every 3 or 4 feet. Any cables that come within 6 feet of the attic access hole must be protected by a guard strip that is at least as high as the cable.

  • Install a 2" by 6" running board over the trusses if your attic is accessible by a permanent set of stairs. Nail a 2" by 4" on edge along each side of the running board to make guard strips. Position the running board as close to the outer edge of the trusses as possible.

  • Run the cables along the top of the running board and staple them down every three feet.

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  • Wiring a House; Rex Cauldwell; 2002
  • Photo Credit Karl Weatherly/Digital Vision/Getty Images
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