Connecting to 110mm soil pipe

[jpadie]

I've got some 112mm half-round guttering from floplast that has a 68mm outlet for a down pipe.  

 

I'm wanting to connect this ultimately to the 110mm soil pipe which runs to a sump from which waste, ground water and rain water are pumped to the main sewage (this is both allowed and preferred in my area, at least until a storm water system is provided).  

 

The challenge is that I can't find a 68mm boss connector.  Am I not looking hard enough or do such things not exist?   (by the by, I don't have the fall to be able to go into a drain and then connect with 110mm pipe.  I recognise that this may end up causing a leaf blockage problem in the pipe at some point. 

An alternative is not to bother at all with rain water collection - the roof is on a garden building that's only 4x3 and the run-off is on to the boundary which is planted on both sides.  the new building replaced a shed that never had any guttering.  

 

any thoughts, please? 

[Onoff]

https://www.plumbingsuperstore.co.uk/product/floplast-110mm-rainwater-reducer-110mm-x-68mm-sp96-p5820.html

 

https://www.bes.co.uk/universal-rainwater-adaptor-25439/

 

I just searched "110 to 68mm adapter". I would try and use the same make if rigid plastic, not all "68mm" fittings are equal sort of thing. A rubber adaptor of another make will be more forgiving. 

[Russell griffiths]

Loads about, solid plastic like the one above or they do a flexible rubber version. 

[saveasteading]

How about a small soakaway. Just a rubble or gravel pit, say 500 x 500 x300 deep? Or a long thin one that would also help the garden in summer.

Or just a 4m length of perforated pipe with membrane around it.

[jpadie]

thanks all

I was searching only in the Screwfix catalogue and nothing was popping up.  probably as I was using a keyword of boss, hadn't had enough coffee or scraped away enough at the cataracts.  If an adapter exists (and actually I think the basic boss-kits from floplast that screwfix sell have an o/d of 68mm) then a downspout connection to the soil stack is the easiest route.  

 

re the idea of a soakaway, there is no scope for digging down unfortunately.  the reason is a bit bizarre but when I was building the garden room I discovered that just beside the plot there was a cistern buried in the ground. covered up and abandoned since at least the 60s but probably much longer.  It's cylindrical, about 4m diameter and 4m deep.  It's plumbed but there's no easy way to tell where the plumbing goes to - looks like it might connect to a well in the garden, which in turn was plumbed to something in the next door property (which used to be part of this one).  The cistern is quite beautiful inside - tiled much like a victorian sewer with enamelled green tiles.  I'd guess it's early 19th century and I suspect that originally it was a soak-away or collector for the entire farm; maybe there used to be a manual pump there.  I'd not be surprised to find french drains connecting in to the network either.  Whilst it's tempting to plumb into this, I just don't know enough about the original purpose nor the structural integrity of the cistern to want to muck about with it or dig too close.

 

 

[Conor]

You really want a gully trap. The amount of crap that comes off a roof is impressive. We've two at the front of the house that connect to 110mm pipes that just open in to the gravel backfill around the house. Having the gully and the grid means none of the leaves and sycamore seeds can get in and clog up the outlet.

[ETC]

Water butt.

[jpadie]

12 hours ago, Conor said:

You really want a gully trap. The amount of crap that comes off a roof is impressive. We've two at the front of the house that connect to 110mm pipes that just open in to the gravel backfill around the house. Having the gully and the grid means none of the leaves and sycamore seeds can get in and clog up the outlet.

Yup.  It's a worry but I don't have the fall to install a drain under a vertical downpipe from the gutter and connect back to the mains.  Unless I install the drain above ground level.  The roof line is not high so may be it's an answer to install a grill over the gutter and clean it manually every couple of months.  

 

@ETC

Water butt is an idea and and that somewhat solves the fall problem too.  But I still have the issue of a trap with a water butt don't I? 

 

[ETC]

If it’s just rainwater from a roof gutter you don’t need a gully trap.

Edited Sunday at 10:55 by ETC

[Tony L]

Our gutters will send the rain water into the same 110mm pipes that will take foul water away.  Our builder built the drains without gulley traps.  The BCO told him to fit gulley traps for the downpipes to feed into.  My understanding is, this is to prevent smells coming up the drain pipes, rather than to trap debris that's washed off the roof.  I could be wrong on the purpose of the traps, but they were a BC requirement.

[saveasteading]

5 hours ago, Tony L said:

this is to prevent smells coming

Correct. And you can get some extreme belches. A grille for leaves is a bonus.