Tiled Roof Soil Stack / AAV question

[3george]

I have three ( pretty ugly ) soil vent pipes on the roof of my property which serve (as I understand ) to provide ventilation to the soil stacks in the house.

I would like to do away with these for aesthetic reasons - so my question is / can I install an AAV ( air-intake-valve ) within the loft space and then make good / tile over & make good the roofline ?

I'd be looking to use something like this > other vendors offer similarly priced products ?

https://www.amazon.co.uk/OsmaVent-4S304 ... B00VEDQOB6


Any reasons why this might not be a good idea given most new properties I see now have no visible soil vent pipes so I'm assuming they must adopt this method.

Thanks for any advice in advance

3g.

[redsturgeon]

http://webarchive.nationalarchives.gov. ... h_2002.pdf

Says you can, page 11

John

[stewamax]

Should be fine if your soil stacks are one of the standard diameters. And the loft is ideal as well: is it above any likely 'flood level' of attached lavatories or basins.

I had a them fitted when I brought a couple of stacks 'in house' during some other plumbing work.
They are very simple devices - normally just a gravity-held flap that opens to let air in when the soil-pipe pressure drops. And even in a loft space there should normally be sufficient warm air in the pipe to prevent the flap freezing.