Air admittance valve advice

[Kayos]

Hi guys

This is my first post please go easy with me! I am quoting a customer for a bathroom refit and he wants the soil stack reducing in height. The stack is currently positioned between the bath and the the wc and the customer would like the soil stxck reduced in height so a concealed cistern can be fitted and a counter top fitted over the cistern and the reduced stack. The stack would be reduce to a height of approx 800mm off bathroom floor with aav fitted.There is another stack open to the atmoshere serving the property. First time doing this type of work are there any problems with this intended insatallation?
Any advice would be gladly received

Kayos

 

[SimonJohns]

You'll need to make sure you vent the aav properly. Other than that I can't see a problem


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[Nat]

Make sure the durgo is above flood level of the basin and is accessible for future maintenance. Other then that you'll be fine mate.

 

[AWheating]

the aav must be above highest spill level (not overflow level) it would be ideal if the valve is accessable and enough room left above for it to be removed if needed.

 

[Kayos]

Thanks for the reponse guys-the customer wants a basin mounted on the countertop so the spill over level would be above the aav-so there goes tha idea! At the risk of sounding completely ignorant, what is the issue of the spill over level being above the aav?

 

[dontknowitall]

You could fit an AAV to the basin trap (and a separate one for the WC) if that helps.

 

[AWheating]

possible damage to valve, aav dont like water. you could reduce the size of the vent pipe and re route if possible? say in a corner?

 

[Kayos]

Thank-you for the suggestions. The stack currently runs from floor to ceiling, against the wall,between the bath and the toilet. The customer is looking to update the look of the bathroom hence the fitted furniture with a counter top. the bathroom is 1.7m x 2.0m (just!) and I have to agree with the guy that soil stack is obtrusive and was looking for a way to give him the clean look he is looking for whilst staying on the right side of the regs and best plumbing practice.

 

[Nat]

Thanks for the reponse guys-the customer wants a basin mounted on the countertop so the spill over level would be above the aav-so there goes tha idea! At the risk of sounding completely ignorant, what is the issue of the spill over level being above the aav?

If there's a blockage in the waste you could have a situation where there is water coming out of the durgo which is likely to be hidden inside a boxing. As stated you could reduce to 2 inch, reroute and use a 2 inch durgo in the corner or elsewhere.

 

[dontknowitall]

My bathroom's about that size. Here's a photo which includes the soil stack. (Not posting to show it off but wondering if it might help.)

www.redlakeplumbing.co.uk

 

[Kayos]

Thanks dontknowitall-nice job! I assume your stack is in the left hand corner of the picture. Using your photo a starting point, imagine the bath pushed back tight against the backwall and the stack boxed in(approx 220mm square box) between the edge of the bath and the basin. I am trying to achieve a similar look as the photo but trying to work round the stack positioned essentially half way a long a wall and not in a corner as is usually the way. Thanks again for the input.

 

[AWheating]

My bathroom's about that size. Here's a photo which includes the soil stack. (Not posting to show it off but wondering if it might help.)

www.redlakeplumbing.co.uk

nice bathroom, did you get a professional in?

sorry!

 

[dontknowitall]

Oh 'eck! That IS a problem.

Here's an idea though - probably silly but it might make you think of something:

How about building a false wall level with the outer edge of the soil stack (so you lose 220mm right across the bathroom)? Either side of the stack you could then create alcoves with shelving back to the original wall and lighting above.

As i said, just a thought and it probably won't work, but it might get you on to thinking "outside the box".

 

[AWheating]

is it an outside wall? reduce to 75 or 50mm and redirect outside and vent?

its an idea....

 

[SimonJohns]

Thinking totally outside or maybe off my box

Vent in to the cavity

Just only give a warranty as long as the drive!


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[AWheating]

you could even fit it outside boxing above basin height and make it into a tooth brush holder? LOL. theres always a soultion!

 

[Kayos]

Sort of been there. The bath has a shower over it which the customer wants to retain, the bath is 1700mm the same lentgh as the room. I have suggested that I replace it wth a 1500mm bath and build a false wall out level with the boxing and, hey presto,it disappears. He wasn't to keen on the short bath idea , having said that ,he is 6'3" so I can understand that he doesn't want to be trussed up like a turkey whilst having a soak! think I'll sleep on tit tonight and hope for a bit (or alot)of devine inspiration

 

[Kayos]

Sorry guys last reply was to dontknowitall-my typing is so slow I missed the other reponses. AW I'm liking the novelty toothbrush holder idea but customer might take some convincing! It is an outside wall-reduce and vent outside-great suggestion. I shall now beat myself up allnight because I should have thought of that. Many thanks for all the responses-particularly the humourous ones-helps keep the stress levels doen and grey hairs away!

 

[stevetheplumber]

why not just take it out in 4 inch and up above gutter level 2 inch isnt realy sufficent vent for the three items unless you run vents to each apliance as in twin pipe system

 

[Kayos]

I see your point-this is the first time I have tackled this situation so I will gladly take on board all advice offered. Cheers Steve
Hopefully in the future I'll be able to contribute to the forum as well as recieve.