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Thread: Question about 3/4 S-Trap

  1. #1

    Default Question about 3/4 S-Trap

    Would this be one? The trap would be that of a 2nd floor shower. The top outlet of the santee would tie into the stack vent in the attic, the bottom into a 90, then run parallel to the joists to the stack ~4 feet away. I know it would be if it downturned directly after the trap outlet, but ~24" away?

    I consider myself an accomplished DIY'er. I don't know everything but help where I can. I'm not a pro, but like to think I'm professional.

  2. #2
    Illinois Licensed Plumber SewerRatz's Avatar
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    Yes, you would need to vent before the offest.

  3. #3
    Plunger/TurdPuncher kingsotall's Avatar
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    What software did you use iminaquagmire¿

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    Consultant cwhyu2's Avatar
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    Quote Originally Posted by kingsotall View Post
    What software did you use iminaquagmire¿
    Me too I use sketchup but havn`t mastered it yet.

  5. #5
    Illinois Licensed Plumber SewerRatz's Avatar
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    I too would like to know which software.

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    Master Plumber nhmaster's Avatar
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    Any time the trap weir is above the trap arm inlet you have the possibility if creating a siphon. I've never been quite wure who coined the term 3/4 S trap and stuck it to just about any non compliant Trap arrangement. True 3/4 S traps were a cast iron fitting.

  7. #7

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    Thanks for the help. Looks like I'll have to figure out another way to do this. I'm trying to raise the trap outlet so that I can fit a can light under the trap for the shower below. The reason it can't go up higher is that the santee pictured in the model doesn't actually exist, instead there is a double fixture fitting for the drain for the bathtub which can't be moved. I just didn't want to take the time to model the other drain.

    I made that in Google Sketchup 6. I haven't tried Sketchup 7 yet but it looks nicer. Both are free but you can buy a pro version for $95. The pro version would be overkill for me, but it may be justifiable for pitching proposal to clients for pros.

    Its really easy to learn and there are many "components" such as sinks and cabinets and fixtures that can be downloaded. I don't know how good it would be for pipes, as its kind of difficult to rotate and line up fittings, but for layout and design its great.
    I consider myself an accomplished DIY'er. I don't know everything but help where I can. I'm not a pro, but like to think I'm professional.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Default 3/4 s

    . A true "S" trap discharges vertically. A "P" trap discharges horizontally, and can be considered a half "S" trap. Discharging at an angle between the two, creates a 45 degree angle which is intermediate between a full and a half so it becomes a 3/4 "S" trap.

  9. #9
    Plunger/TurdPuncher kingsotall's Avatar
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    Quote Originally Posted by iminaquagmire View Post
    I made that in Google Sketchup 6.

    I don't know how good it would be for pipes, as its kind of difficult to rotate and line up fittings, but for layout and design its great.
    Nice. I'm still learning how to plan layouts isometrically. I'll stick with my 30/60 right triangle for now.

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