Straps for PVC DWV

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by r_ventura_23, Jun 5, 2014.

  1. r_ventura_23

    r_ventura_23 New Member

    Joined:
    Apr 24, 2014
    Location:
    NJ
    What is the best way to strap pvc vents in an attic that are running horizontally(with a slight pitch)? They only run a few inches above the floor, and the ceiling is anywhere from 4 to 6 feet higher then the vent pipes. Should I attached the straps all the way to the roof rafters or is there another way to support these pipes?
     
  2. Sluggo

    Sluggo Member

    Joined:
    Mar 28, 2014
    Location:
    WA
    Cut blocks of the right heights from 2X4's or 2X6's and toenail them to the floor with nails or screws. Then strap the pipe to those.
     
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  4. r_ventura_23

    r_ventura_23 New Member

    Joined:
    Apr 24, 2014
    Location:
    NJ
    Thanks. That sounds easy enough!
     
  5. Sluggo

    Sluggo Member

    Joined:
    Mar 28, 2014
    Location:
    WA
    You're welcome. Two other tips:
    1) Pre-drill the holes in the blocks whether you use nails or screws: it will prevent splitting and make installation easier.
    2) Put some construction adhesive on the underside of the blocks to increase stability.
     
  6. r_ventura_23

    r_ventura_23 New Member

    Joined:
    Apr 24, 2014
    Location:
    NJ
    One more question. Should I wrap the strap completely around the pipe or just enough to tie into the 2x4 over the pipe and back into the 2x4. Also, what kind of straps do most people use?
     
  7. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    Just curious, but what is PVC pipe doing in your attic? PVC can only be used for drain lines inside a house. Perhaps you mean CPVC?
     
  8. DaveHo

    DaveHo Member

    Joined:
    Mar 12, 2010
    Location:
    SE PA
    OP described these pipes as vents. If they are plumbing vents, I don't believe you are permitted to run them horizontal in the first place.
     
  9. Sluggo

    Sluggo Member

    Joined:
    Mar 28, 2014
    Location:
    WA
    OP-
    If you make the blocks not much wider than the pipe diameter, or you have the blocks under and parallel to the pipe, you can simply put a strap over the top and screw it down on both sides. I see no value in wrapping the strap completely around.

    DaveHo-
    You can run a vent horizontal as long as that section is at least 6" above flood level of any fixture it serves.
     
  10. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    You can use PVC for waste and vents most places, and ABS fewer places.
    If a vent's horizontal is more than a 1/3 of the total vertical, it needs to be upsized one dimension. Most of the time it's not an issue.
     
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