Saniflo into existing WC connector

[snapperdg]

Hi,

I know I should burn the house down before installing one, but I really don't have a choice...

Due to the way our sewers are laid out, it's gonna be a huge job to lay the necessary pipes to put in place a new soil stack that Building Control say we need for an ensuite.
Currently the only toilet is ground floor, with the toilet discharging directly into the sewer via a 4 ft channel, which is all underground with no venting.

Is it permissible to connect a Saniflo outlet to a WC waste boss, like this one on Wickes website?

Cheers

d.

 

[Agile]

Thats an interesting question!

I am not aware of any regulation which is breached by doing that ( and I have done it myself at my own property! ).

However, as my main theme is fixing boilers its possible that there is some reason why you should not do it.

Lets see what others say!

Tony

 

[snapperdg]

Thanks Tony.

Did you say you are using one of these for your Saniflo?
If so, I assume it works OK?

The other thing I thought of is a standard strap on waste boss onto the side of a standard WC boss...

Cheers,

d.

 

[snapperdg]

Hi,

Just wondering if anyone had any other ideas?

Cheers

d.

 

[Nige F]

Sounds fine to me ..Tho` a strap on boss fits to soil pipe

 

[Richard C]

Never fitted a Saniflo so don’t know what is acceptable under B/regs or would be regarded as acceptable by BC. I would advise you clear it with them first as, ultimately, it’s going to be your BCO that will inspect & sign it off.

Installing a new stack/foul drain can be a real pain but it’s generally no more than a days hard work with the right equipment &, personally, I’d rather do that unless there really was no option.

 

[dextrous]

I see nothing wrong with this arrangement - it is, in effect, the same as a boss strap. Although I am a bit curious that there is no ventilation pipe on the drainage system anyway.

 

[Richard C]

I see nothing wrong with this arrangement - it is, in effect, the same as a boss strap. Although I am a bit curious that there is no ventilation pipe on the drainage system anyway.

A ground floor w/c branch pipe may discharge directly into the foul drain (no vent) as long as the depth from the floor to the invert is less than 1.3m. I’m not sure how this is affected if you connect a Saniflo to the back of it & I should think the length of the Saniflo waste run would also have a bearing on matters, hence my recommendation to speak to your BCO before you do anything.

 

[dextrous]

I see nothing wrong with this arrangement - it is, in effect, the same as a boss strap. Although I am a bit curious that there is no ventilation pipe on the drainage system anyway.

A ground floor w/c branch pipe may discharge directly into the foul drain (no vent) as long as the depth from the floor to the invert is less than 1.3m. I’m not sure how this is affected if you connect a Saniflo to the back of it & I should think the length of the Saniflo waste run would also have a bearing on matters, hence my recommendation to speak to your BCO before you do anything.

I'm struggling to find where that 1.3m comes from. I'm aware that the minimum distance from the lowest discharge to the invert for a ventilated stack should be 450mm (or 750 if the house is over 3 stories). Can you direct me? Thanks

However, as BCO should be involved anyway, then it won't cost anything extra to ask for clarification.

 

[Richard C]

I'm struggling to find where that 1.3m comes from. Can you direct me? Thanks

Part H, clause 1.9 diagram 1, page 7.

 

[dextrous]

I'm struggling to find where that 1.3m comes from. Can you direct me? Thanks

Part H, clause 1.9 diagram 1, page 7.

So it does! Gives a nice diagram to for people that can't read