"Harv" wrote in message
...
Hi all,
The Problem :-
I have a conservatory style plastic roof over a room on the side of the
house. The waste stack runs up the inside corner of this room, and out
through the current roof, where much flashband has been applied to stop it
leaking.
However the current roof is a very poor consruction, nearly flat and only
10mm thick. Oh, and it leaks too.
The plan is to replace the whole roof with a self supporting UPVC system
with 25mm thick multiwall glazing, increasing the slope of the roof at the
same time.
With the increased slope, it would be sensible to fit an air admittance
valve above where the toilet connects into the stack, but the valve would
actually be below the level of the trap in the hand basin. All of this
would
be inside the room, but the stack would not need to penetrate the new
roof.
Is this likely to cause any problems?
Presumably the valves do not allow any odour to escape?
Any experiences of doing something like this?
Thanks in advance!
Harv
Hi Harv,
If this stack is an outlet from a WC, then get ready for the smells Sir. A
soil stack should vent to air, if at all possible, as it vents rather
unpleasant gases and fumes into where ever the end of it is.
Would it be possible to take a couple of bends and take the pipework out
through a side wall of the room and then rise ? I don't fancy the idea of
it venting into anywhere I'd like to spend some relaxing time.
The air intake valve must be a minimum of 500mm above any appliance using
it, to prevent any damage from soiled water spillage due a block in the
pipework forming the drainage system, and must be given an access opening
for the purpose of clearing any blockage. So if you are thinking of an air
intake valve, then you'll have to fit it on top of a branch pipe with local
access eye to be able to clean through the pipework.
Hope this is of some use.
---
BigWallop
http://basecuritysystems.no-ip.com
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