Installing range duct hood In vinyl siding

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Old 10-16-17, 08:15 AM
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Installing range duct hood In vinyl siding

I need to install an exahust hood in vinyl siding. The hood has a 7" round duct pipe and a 10" x 10" flange. I have J channel, some foil window/siding tape, and some rubber/foil tape for sealing under window rough openings.

After reviewing some other posts, this is my tentative plan. Please help me revise plan as needed.

  1. Cut the 7" round hole first
  2. Then cut a 10.5" x 10.5" square hole in the siding centered around the round hole.
  3. Use rubber/foil tape to seal across the sides of the round hole
  4. Use the azek to make a 10 x 10 block, and tape that block to the wall with foil tape, taping bottom first, then sides, then top.
  5. Caulk the sides of my taped Azek block
  6. Install J channel around my Azek block
  7. Install foil tape over the top and sides piece of J channel (not the bottom).
  8. Caulk the front of the tape covered Azek block
  9. Insert hood, and screw the hood through the azek and into the rim joist.
  10. Caulk where the hood meets the J channel.
 
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Old 10-16-17, 09:04 AM
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Sounds very thorough, but all the caulk us likely unnecessary. Your time would be better spent putting a wide metal flashing under the bottom j-channel, notched up around the sides a bit, then let that flashing hang over the nail fin of the siding hem below. This directs water that does get in to the weep holes of the row of siding that covers it.
 
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