Hi all!! Although I am new to the site I have used it numerous times to resolve small queries regarding many of the DIY jobs I have done. Now on my third renovation I have come across a very simple to solve problem but just want to check I am barking up the right tree.
I have a very conventional 1st floor toilet with full SPV. This goes directly down, through the garage and into the screed floor. It then hangs a 90deg bend and travels under the house until it is directed toward the first manhole.
As luck would have it, the soil pipe runs as near as dammit to where I want to put a downstairs loo. I have no problem breaking into this and routing the new soil pipe into this.
Bearing in mind I will be fitting a sink in the same downstairs loo area and will but the drainage from this into the new section of soil pipe, do I need to fit an AVV to the new toilet's outlet?
(I am assuming 'yes' as I will need to counteract the negative pressure created by the loo)
I have a very conventional 1st floor toilet with full SPV. This goes directly down, through the garage and into the screed floor. It then hangs a 90deg bend and travels under the house until it is directed toward the first manhole.
As luck would have it, the soil pipe runs as near as dammit to where I want to put a downstairs loo. I have no problem breaking into this and routing the new soil pipe into this.
Bearing in mind I will be fitting a sink in the same downstairs loo area and will but the drainage from this into the new section of soil pipe, do I need to fit an AVV to the new toilet's outlet?
(I am assuming 'yes' as I will need to counteract the negative pressure created by the loo)