Hi all, havnt been on site for ages. Got an issue with a vent pipe.

[lattin]

I have plumbed a 2 bed bungalow, leaving out 1 1/2 wastes under concrete floor for shower and basin as part of first fix. I am now back on site for 2nd fix. The job is in the countryside so all waste goes to a septic tank. The builder ran all outside wastes which includes a 4 inch sewer pipe under footpath to tank. He didnt however run up a vent pipe over eaves. To save breaking up footpath could I run up 1 1/2 vent using a strap on boss to main 4 inch. in ground

 

[exedon2]

Building regs H 1.32 not less than 75mm

 

[king of pipes]

Needs to be vented as above builder need to get digging 😉 kop

 

[Deleted member 120897]

Shouldn’t be all that hard if there’s new pvc 4” drain?

 

[lattin]

Am I right in thinking that a vent pipe is to stop build up of gasses in the sewer system.

 

[Deleted member 120897]

Am I right in thinking that a vent pipe is to stop build up of gasses in the sewer system.

More to do with stabilising the pressure and allowing air to be drawn in, therefore not allowing the traps to be sucked out of appliances and emitting odours into the building.

 

[Ben-gee]

As above, but the vent pipe also stops build up of pressure - otherwise a Durgo would do - in some cases this can cause smells by sewer gases ‘bubbling up’ through shallow traps , yucky.

 

[lattin]

Ok, think Durgo lets air in. Makes since, to stop syphoning back from traps