ABS pipe instead of sheet metal downspouts

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by k2014, Feb 15, 2020.

  1. k2014

    k2014 New Member

    Joined:
    Mar 6, 2014
    Location:
    WA
    Anyone have any thoughts about using ABS DWV pipe for downspouts instead of the crappy, drippy, thin sheet metal stuff?

    I've used it before and cut some unions into C-shapes to serve as snap-on fittings to the side of the house, and it worked pretty well, and paints up nice, too. It's a nice smooth interior with no screw to snag on debris. I'm going install a new 6" half-round gutter system in the summer and have been thinking about using 3" ABS for the downspouts.
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I see ABS and PVC being used on some commercial buildings. Sounds good to me. Don't get glue on the house.
     
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  4. k2014

    k2014 New Member

    Joined:
    Mar 6, 2014
    Location:
    WA
    Roger that. I'll do all my gluing in the yard, then prime and paint (except where the custom snap-in C-fitting engages).

    I'm still debating on whether to let the ground pipe support the vertical weight reaction, or if I should let the c-fitting on the house take that load with a strategically-placed union or elbow to transfer the load. I guess if I support the load up higher on the house, I'll get less thermal expansion/contraction near the joint where the gutter outlet dumps into the first ABS 60° downspout elbow. Maybe it doesn't matter much.
     
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