Anyone used a vent like this?

[ipjodan]

Hi all,

Ive posted this in the plumbing forum but have had no luck -

Anyone used one of these vents to vent a soil pipe? If so what do you think? Will it work well with a marley modern?

Cheers

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=79071&ts=15051

 

[noseall]

why don't you just buy a marley modern tile vent terminal.

all you need to specify is the colour, which are commonly either smooth grey red or brown.

 

[^woody^]

Soil pipes should be a certain distance above any roof. Tile vents should not be used for this purpose.

Why not just fit an air admitance valve in the roof space?

 

[Roofer]

Tile vents are designed for venting SVP's

AFAIK the height requirement is 900mm above an opening eg window or rooflight

 

[jeds]

You can use a tile vent on the roof slope to terminate an SVP but it must be positioned no more than half a metre away from the ridge. If it is any lower than that the terminal must be extended to at least ridge height.

 

[Roofer]

Sorry jeds I can't agree with that; if you leave aside the question of the tile vent and had just a plastic pipe, plenty of them come through the lower part of the roof are you saying they have to be extended higher than the ridge?

 

[ipjodan]

Just got this from the planning portal -

http://www.planningportal.gov.uk/england/genpub/en/1115314018395.html

Soil and Vent Pipe

This pipe is used to vent the smells and gases that form within the sewer system and help to transfer the waste vertically to the nearest inspection chamber. The fewer bends within the soil and vent pipe between the highest entry level of a wastepipe to the inspection chamber the better it will work, generally no more than 4 bends. Above this level the pipe can terminate and vent externally wherever is convenient. However if it is within 3.0m of an openable window then it should terminate at least 0.9m above that window.

Ive got the tile and it looks like it will work a treat.

 

[jeds]

The above link to the planning portal is talking about freestanding SVPs. This is not the same as venting through a rooftile vent where there is specific guidance. I can assure you I am right. See Approved Document F1 diagram D1 on page 45.

http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADF_2006.pdf

 

[Roofer]

jeds, you are linking to Document F1 which deals with ventilation of buildings and specifically to PSV (Passive Stack Ventilation) which has got nothing to do with SVP (Soil Vent Pipe) venting.

I can assure you that the positioning of a SVP whether by vent tile or just the pipe itself is subject to very little restriction

 

[jeds]

Sometimes these threads get convoluted and confused. Generally, there is no provision for venting SVPs through a roof tile vent. But BC will allow it as long as you keep the vent within 500 of the ridge. This is because the area within 500 of the ridge is under negative pressure. Anywhere else on the roof surface is subject to positive pressure and this is why it's generally not allowed.