Eric Garcia | October 05, 2016

YouTube // Roofing, WRB & Flashing

How to Install and Flash a Tubular Skylight


Flash the boot like any other roof penetration, and snap the tube into place—just make sure to align the hole between the ceiling joists...


Step by step:

  • Mark the roof between two ceiling joists
  • Turn the flashing piece upside down and mark the circle on the roof.
  • Cut the hole about an inch larger than the circle.
  • Nail the flashing to the roof deck, weaving it into the shingles. Use 4-5 nails per edge for wind resistance. Note: in areas with higher rainfall than LA, tuck the upper edge of the flashing under the roofing underlayment, shingle-style.
  • Spread  roofing cement along the top and side edges of the flashing.
  • Continue shingling around the flashing.
  • Apply silicone sealant to the light tube's interlocking collar.
  • Paint the exposed metal black or whatever color you desire.
  • Peel the plastic off the tube top.


—Eric Garcia is a roofing contractor in the LA area who posts a lot of videos to YouTube



"Flat" (low pitch) roofs are different than sloped. Always use a built-up curb that is counter flashed under the membrane, or use a new vertical wood or metal chase to reach up to more sunlight above obstructions, with a sized opening in a galvanized edge-to-edge cap. An elevated chase can extend lighted times significantly. Full moonlight seems like daylight if the reflective material is used correctly. Aiming the tube to maximum exposure is important.

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