How to install roofing soffit board

Written by cameron easey
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Finishing a roof or siding project may involve installing soffit boards or panels on the underside of eaves or roof overhangs. Soffit typically connects roofing with siding; a properly installed soffit system helps ventilate the exterior of your home. You can install soffit boards or panels depending on how you want to match your existing home's siding.

Skill level:

Things you need

  • Aluminium soffit panels or wood soffit boards
  • Soffit vents
  • Fascia panel
  • F-channel strips
  • Pry bar
  • Hammer
  • Nails
  • Nail gun
  • Tape measure
  • Circular saw
  • Cordless drill

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  1. 1

    Determine whether you need to replace a small portion or entire sections of your soffit system. If you find old or discoloured soffit, you probably need to replace the entire soffit.

  2. 2

    Demo or remove the old soffit panels, F-channels (small strips that support one end of the soffit panel) and fascia cover from your old soffit system. Use a pry bar to remove the fascia cover and the F-channel from the eave or roof overhang.

  3. 3

    Install new F-channel strips on the underside of your eave or roof overhang. Using a hammer and nails or a nail gun, attach the F-channel to the rafters in the previous location of the old strip.

  4. 4

    Measure from the F-channel to the inner edge of the sub fascia. Subtract 1/4 inch from your measurement, and cut the soffit panels to size using a circular saw.

  5. 5

    Install the first soffit panel by placing one edge in the F-channel. Use a framing square to make sure you've lined up the panel squarely with the sub fascia.

  6. 6

    Secure the panel to the sub fascia by hammering a nail into the soffit panel's V-groove (a small channel located in the centre of the panel).

  7. 7

    Place the net panel in the F-channel and slide it against the first panel to lock them together. Install the remaining soffit panels the same way.

  8. 8

    Attach the fascia to the roof soffit to complete the installation. The fascia has a lip at the bottom that will cover the edges of the soffit panels.

Tips and warnings

  • You can also use screws to secure the F-Channel to the rafters.
  • Use a vented soffit panel every third or fourth panel during installation.
  • You can also nail wood soffit boards to the bottom of your roof overhang instead of using aluminium soffit panels.
  • Watch out for the nests of insects, such as wasps or bees, when removing the old soffit from your roof overhang.
  • If you use wood soffit boards, you'll need to purchase separate vents to install in order to allow for adequate air circulation.

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