Vent flashing

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by noppenbd, Jun 7, 2012.

  1. noppenbd

    noppenbd New Member

    Messages:
    2
    Location:
    Maryland
    I am building a new powder room (toilet & lav) and I need to install a new 1-1/2" vent through the roof. The piping will be PVC. The roof is essentially flat (1/12 pitch) and is a roll roof (composition type sheets approximately 4' wide), with a silver reflective coating applied to reflect solar energy. I am thinking of using a roof flashing which has a galvanized plate, with a neoprene boot that is flexible enough to accommodate the low pitch. Similar to this: flash01.jpg
    I would using roofing cement, slide on the flashing, then apply more roofing cement, roofing felt around the perimeter, and more roofing cement on top. Does this sound like a good solution?

    Dave
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,635
    Location:
    Cave Creek, Arizona
    IT is probably your ONLY good solution.
  3. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,173
    Location:
    Maine
    Will Maryland let you punch an 1-1/2 vent through the roof? Up here we can't use anything smaller than 3"
  4. noppenbd

    noppenbd New Member

    Messages:
    2
    Location:
    Maryland
    We are not in the frost-closure area so it is my understanding that the 3" minimum doesn't apply.
  5. TTopPlumbing

    TTopPlumbing New Member

    Messages:
    7
    Location:
    Orange County, Ca.
    Coming from custom home plumbing you are on the right track. Typically you do not even need the flashing with rubber boot, just a galvanized roof jack with mastic is how most roofers complete the seal possibly using torch down. Copper flashing and lead flashings are another option.
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