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Housing - New Build: Inside or outside for a soil-pipe?

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    Posted By: qeiplI can imagine a stack covering two storeys with WCs on both levels would need a vent at the top of the stack.
    My house will be 2.5 storey, so I'm wondering whether I can get away with your arrangement underground/outside if I put AAVs at the top of each internal stack.

    David
    •  
      CommentAuthorjoe90
    • CommentTimeJan 19th 2012
     
    I have also had a BCO not allow a toilet and basin connected to a boss without an AAV (there was an external vented stack from the ground level drains )and that AAV had to be above the height of the overflow on the basin. Just another example of different BCO's with different views.:cry:
    • CommentAuthorborpin
    • CommentTimeJan 19th 2012
     
    Posted By: joe90I have also had a BCO not allow a toilet and basin connected to a boss without an AAV (there was an external vented stack from the ground level drains )and that AAV had to be above the height of the overflow on the basin. Just another example of different BCO's with different views.http:///newforum/extensions/Vanillacons/smilies/standard/cry.gif" alt=":cry:" title=":cry:" >
    It really depends on the length of the un-vented tee from the vented main run. I think if it is any more than a meter or so, they will look for an AAV at the end of the Tee.
    •  
      CommentAuthorjoe90
    • CommentTimeJan 19th 2012
     
    Posted By: davidfreeborough
    Posted By: qeiplI can imagine a stack covering two storeys with WCs on both levels would need a vent at the top of the stack.
    My house will be 2.5 storey, so I'm wondering whether I can get away with your arrangement underground/outside if I put AAVs at the top of each internal stack.

    David


    I dont see why not, maybe worth checking with your BCO before you fit it as you will see above there are different opinions even among BCO's
    • CommentAuthorpmagowan
    • CommentTimeJan 19th 2012
     
    quote from Tony "The only reason to box them in outside would be if you felt that they looked ugly, otherwise a waste of time and materials and causes future accessibility problems (another reason why I dont like them inside) "

    Would boxing them in not reduce the heatloss from the exit through the wall and also help prevent them freezing in the cold? I also thought it could reduce the wind-load on them and the risk of a plant growing behind them and putting pressure on the fixings.
    Paddy
    • CommentAuthormrsherbie
    • CommentTimeJan 20th 2012 edited
     
    We are new build airtight and have run our SVP though passivent(large white plastic ducting) inside our warm roof (only as we have no 'lofts' or hidden spaces, or first floors except 1 bed+bath upstairs, (+1 bath groundflr) we are fully open 2 storey full oak frame with 50degree pitch) it comes out under a specially handmade Keymer clay hogs back ridge tile, (as we have 4 other passivent ridge tiles anyway for passivents) or you could use an inline tile vent for a SVP that does'nt need such high airflow, but they were too 'visible' for me:
    http://www.keymer.co.uk/products/Ventilation%20Range/

    I didnt want any junk on my lovely clay roof either. I would post a photo but there is nothing to see, it is successfully invisible
    :bigsmile:
    • CommentAuthorTimSmall
    • CommentTimeJan 22nd 2012 edited
     
    Posted By: davidfreeboroughCould the AAVs be fitted under one of the sinks to allow easier access? What's an anti vac trap?
    David



    Have you looked at any of the P-trap replacements like "HepvO"? I believe you can dispense with the addition soil pipe AAV if you use one of these on the nearby basin (or if you don't have a nearby basin, or any other similar P traps for the suctioning to occur from, then you don't need an AAV at all, I think).

    Looking at the design of those HepvOs, I don't think I'd feel happy with using them on a shower or bath tho - too much scope of hair etc. keeping them wedged open a crack I think, but if it's accessible like a P trap under a sink normally is, then they look OK to me.

    I'm a bit new to drains, so I'm not 100% on this by any means...

    Tim.
    • CommentAuthorCWatters
    • CommentTimeJan 22nd 2012
     
    Posted By: joe90I have also had a BCO not allow a toilet and basin connected to a boss without an AAV


    The regs allow another method. See Part H, Para 1.22 "Branch ventilation pipes" and diagram 4.

    In addition to the main branch pipe you run a smaller vent pipe from the stack (above where the main branch connects) to the far end end of the branch.

    http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADH_2004_NEW.pdf

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