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roll top bath trap

Discussion in 'Plumbing and Central Heating' started by stevethejoiner, 21 Sep 2013.

  1. stevethejoiner

    stevethejoiner

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    Hi guys.

    Can you help me with out on the correct trap options for roll top bath.

    Basically can I use a shallow trap when running directly into a SVP.

    I am fitting a roll top in the middle of a room on a tiled suspended wooden floor. Structurally all strong and good and the floor joists are running in the right direction. I can drop a 40mm waste down through the tiles and floor boards with a 90 bend, and run 2mts of waste pipe to an internally fitted SVP. I plan to fix a strap on boss onto the existing SVP.

    The trap and overflow will be visible so it will be chrome, but can I use a shallow bath trap if running directly into SVP and not to a gulley or hopper?

    If not what other chrome traps and waste are there for a bath on claw feet?

    Ah, thinking about it, I have the same issue with the shower tray! shallow trap running into a soil pipe, is it done, is it allowed?

    Thanks Steve.
     
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  3. CBF

    CBF

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    it's the other way around, you need a deeper seal trap when connecting to a svp
     
  4. stevethejoiner

    stevethejoiner

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    I obviously did not explain myself properly.
    That is my question. I am connecting to an SVP and planned to use a shallow trap but I have only recently realised there may be problems with a shallow trap going to SVP.
    So what I ask is what type of trap can I use when plumbing in a bath and shower into an SVP when I do not think there is space for a deep trap under the shower and bath and when I also I want to keep the underside of the roll top bath looking good as it will be visible.
     
  5. Nige F

    Nige F

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    You can use a Hep V O waste valve with a bent adapter under the bath
     
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  6. xr4x4

    xr4x4

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    On the shower waste, you can buy highflow shower wastes with one way valves in them.

    I'm assuming a shallow trap will only cause problems on a stack if not vented correctly?
     
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  7. stevethejoiner

    stevethejoiner

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    This is the type of waste and trap I want to use. http://www.victoriaplumb.com/images/view1/Roll-Top-Bath-Waste-A_160.jpg
    But is it OK to run straight into soil stack.

    Yes, the soil pipework is all vented properly. In fact, not only is the last and highest point vented out at roof, but any 40mm waste that runs into the soil pipe also has air admittance valves at the end of the last sanitary fitting.
     
  8. stevethejoiner

    stevethejoiner

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    Not really, they are plastic and I cant see anyone offering a chrome version suitable for being visible under a roll top bath.

    But maybe a good choice if you need a water less trap, for caravans maybe, or where evaporation is an issue. The problem is the only access to under my shower tray after the installation will be by removal of ceiling below. And I do have reservations about the rubber valve in the Hep V O not closing properly after a time. I have read that trapped hair and soap residue can hold the valve open and so they should only be used with access for cleaning.

    But I would really consider one if they did chrome!

    Thanks.
     
  9. denso13

    denso13

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    You need a 50mm trap seal. Hard to tell from the picture.
     
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  11. stevethejoiner

    stevethejoiner

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    I think basically what I am asking is -:

    Are there any regulations that say 'you cannot run a shallow trap into a SVP'

    Because if not, and as I am 100% sure I wont have a syphon problem as my soil is so well vented already, and if there is nothing that says i can't then I shall go ahead and fit the fancy chrome shallow bath trap and waste.

    Thanks Steve.
     
  12. denso13

    denso13

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    Regulations say you need a 50mm minimum trap seal.
     
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  13. stevethejoiner

    stevethejoiner

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    Thank you.

    What I was going to buy would be no good. It was listed as roll top waste and overflow, and I assumed it had a shallow trap, but looking at the photo there does not appear to be a trap seal as the overflow drops straight down. So I suppose one would have to fit a trap below to floor if fitting that waste and overflow set up.

    Thank you

    steve
     
  14. Madrab

    Madrab

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    How much space do you have under the raised floor, at least 100mm given the standard joist height? do you have enough to put a p trap directly below the drop through your floor?
    Or you could manufacture a 40mm P Trap, with a 50mm seal, out of 3 90 degree swept elbows and a cple of pieces of 40mm. Had to do that once before due to height restrictions under a floor but do need to leave access for cleaning etc
     
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  15. stevethejoiner

    stevethejoiner

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    I have 225 joists so plenty of room, and that was an idea, but the floor is fully tiled with 600 x 600 limestone, so as said earlier the only access will from underneath, and I don't fancy a trap door in the centre of the plaster ceiling below.

    However today I put the claw feet on the roll top and set it on the floor. I have no waste fitted but the distance from the bottom of the waste outlet hole to the limestone floor is 120 mm so a standard P trap will be ok I think. And I am sure they are available in Chrome.

    Thanks.
     
  16. Madrab

    Madrab

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    Could also look at getting an S Trap, that will allow you to run the pipe straight down after the trap rather than have to put some pipe and an elbow onto the end of the P trap to take it down through the floor. Only trouble would be the overflow I guess unless it's integral to the waste.
     
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