Angled Drain Pipe into Kitchen Cupboard

[Spinny]

See photo. The drain pipe running to our kitchen island sink unit does not come vertically up from the floor. It runs at a jaunty angle both front/rear and side/side relative to the kitchen sink cupboard that will sit above it.

 

So how is this best dealt with so that the waste pipe/traps etc inside the cupboard can be kept neat and vertical ?

(PS Any photos showing how drains are normally brought up into a kitchen cupboard ?)

[Russell griffiths]

Fit trap to sink, use two 45 bends to realign with floor waste. 
cut a large trap door 200x200 in cupboard floor, sort the pipework then make a nice cover trim to go over the 200 hole, it’s far easier than trying to cut a 50 mm hole and getting it all to line up. 
especially if you are using the same monkey knuckle draggers you had to install that pipe. 

[Nickfromwales]

https://amzn.eu/d/0ejwJXIa
 

Lose the rigid one, and use the above to give you enough wiggle room to get these pointing vertically again. 

[Spinny]

Thanks again.

TBH I don't really fancy those bung type connectors. Our drains have been blocked a few times creating some backup. Most recently by our neighbour, whose drain feeds into our manhole - and he has two extensions and no soakaway. So if the drains backed up I wouldn't want a leak at or under floor level. Seems better to me to have a leak at a manhole cover or surface drain at ground level outside. To effectively ensure any back up would rise up the waste pipe rather than leak out. A plumber fitted a bung but it seemed loose and potentially prone to leaking. Also might an enterprising stray rat disturb it.

 

I have now seen there seem to be some small pipe angles - could I somehow put a 15 degree or 11 degree bend on the 110 pipe to try and get it vertical ?

 

Also can I ask what the form is for drains and wastes in kitchen cupboards. It seems to be common to keep the 110 drain under the base board of the cupboard and convert to smaller waste pipe size below the baseboard and just bring 40mm through the base board. But am wondering whether this is ideal because...

1. If there is a leak at the 110 to 40 join (including by a backup) then you won't know because it is hidden.

2. If you want to clear the 110 pipe of a blockage, you can't access it to rod it except through the 40mm waste pipe, or from the other direction.

3. If you want to take the waste pipe and traps apart to clean them all out, then you can't remove the lower 40mm waste pipe because the join to 110 is below the baseboard.

 

Your trap door partly addresses this although seems to be rather fixed in place by water pipes also going through it.

 

Is it just nuts to bring the top edge of the 110 pipe through the baseboard ?

 

I am possibly over thinking I guess. Poor trades people make you paranoid.

 

Pic show what is currently in place in my utility - will place two 40mm connections through the base board - is this madder than a mad thing - should I get it reworked before the kitchen fitters come ?

[Nickfromwales]

1 hour ago, Spinny said:

I am possibly over thinking I guess

Guilty as charged lol. 
 

The rubber bungs are very good, and have never caused me any issues, and I have used them for as long as I can remember.

 

I would switch to 1x 50mm pipe / bung, and then T off in the cupboard for the two connections.

 

I bring the 50mm pipe vertically into the bottom of the unit, then install a Y branch. Into the branch I install a 50mm cleaning eye (this will provide adequate rodding access to the 110mm pipe) and use the top of the branch for accepting waste water from the sink and appliances.