Soil stack replacement Q
Hi guys
our bungalow ("L"-shaped) has a nuisance soil stack (stench pipe) situated in the back, in the inside corner of the "L". Currently it's made of cast iron, looks grotty,and is a pain, as the guttering is squeezed behind the angle where it goes up. I know it's possible to replace it with a straight pipe, which enters the eaves, and vents through a chimmney in the roof (replacing a tile). However, since the purpose of the pipe is to admit air (to prevent siphonage), is it possible to fit a new shorter pipe, with an air- admittance only valve ? I'm sure I've seen one advertised ... thanks in advance |
Soil stack replacement Q
Jethro wrote:
our bungalow ("L"-shaped) has a nuisance soil stack (stench pipe) situated in the back, in the inside corner of the "L". Currently it's made of cast iron, looks grotty,and is a pain, as the guttering is squeezed behind the angle where it goes up. I know it's possible to replace it with a straight pipe, which enters the eaves, and vents through a chimmney in the roof (replacing a tile). However, since the purpose of the pipe is to admit air (to prevent siphonage), is it possible to fit a new shorter pipe, with an air- admittance only valve ? I'm sure I've seen one advertised ... It's not only to admit air - the stack pipe also has the function of venting the sewer. Building control like to see a vent every few houses. |
Soil stack replacement Q
Jethro coughed up some electrons that declared:
Hi guys our bungalow ("L"-shaped) has a nuisance soil stack (stench pipe) situated in the back, in the inside corner of the "L". Currently it's made of cast iron, looks grotty,and is a pain, as the guttering is squeezed behind the angle where it goes up. Having just done one, you can certainly tweak it out more - two 135 degree solvent bends to swan the pipe out can clear the gutter by quite a wide margin. Solvent weld ensures the free standing bit of 1m ish dangly pipe can be sufficiently supported by the clips below it down the wall. You can do the vent pipe in 82mm too - black PVC looks fairly smart. I know it's possible to replace it with a straight pipe, which enters the eaves, and vents through a chimmney in the roof (replacing a tile). Yes - I used to have one like this. However, since the purpose of the pipe is to admit air (to prevent siphonage), is it possible to fit a new shorter pipe, with an air- admittance only valve ? I'm sure I've seen one advertised ... No - you need to be able to vent positive pressure too. Building regs say vent is =3m from all openings *or* 900mm above the tops of those openings that are closer than 3m. Cheers Tim |
Soil stack replacement Q
Jim wrote:
Jethro wrote: our bungalow ("L"-shaped) has a nuisance soil stack (stench pipe) situated in the back, in the inside corner of the "L". Currently it's made of cast iron, looks grotty,and is a pain, as the guttering is squeezed behind the angle where it goes up. I know it's possible to replace it with a straight pipe, which enters the eaves, and vents through a chimmney in the roof (replacing a tile). However, since the purpose of the pipe is to admit air (to prevent siphonage), is it possible to fit a new shorter pipe, with an air- admittance only valve ? I'm sure I've seen one advertised ... It's not only to admit air - the stack pipe also has the function of venting the sewer. Building control like to see a vent every few houses. Yes that's one of the specific regs: if next door has a vented stack you're probably OK. Also you can't be the last property at the end of a row (eg cul-de-sac) so that your AAV valve is at the blind end of the drainage system. David |
Soil stack replacement Q
On Mon, 29 Jun 2009 04:51:44 -0700 (PDT), a certain chimpanzee, Jethro
randomly hit a keyboard and produced: our bungalow ("L"-shaped) has a nuisance soil stack (stench pipe) situated in the back, in the inside corner of the "L". Currently it's made of cast iron, looks grotty,and is a pain, as the guttering is squeezed behind the angle where it goes up. I know it's possible to replace it with a straight pipe, which enters the eaves, and vents through a chimmney in the roof (replacing a tile). However, since the purpose of the pipe is to admit air (to prevent siphonage), is it possible to fit a new shorter pipe, with an air- admittance only valve ? I'm sure I've seen one advertised ... You can't mount it externally. -- Hugo Nebula "If no one on the Internet wants a piece of this, just how far from the pack have you strayed?" |
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