Open drain in conservatory - how to plumb and lay a recessed cover

[Throwgnilli]

Hi,

I've recently bought a house and the drain is open in the conservatory.

I think it's an old clay grey water drain and has the pipe from the kitchen sink coming out the wall about two feet up and running straight down into it.

My idea is to redirect the pipe to come out the wall under the level of the finish floor which is still above the drain height by drilling through the kitchen slab and popping a brick out just above the drain.

When this pipe is out the way and coming through the wall lower down I want to install some fixings to rest a recessed drain cover onto, in order to close it up in the conservatory and then use some sealant to block around where the pipe comes through the floor and into the drain through the kitchen slab/wall.

Any advice would be massively appreciated.

Any advice on whether this is the best way to do it, whether the recessed drain will sit on fixings coming out the side of the slab (it's a hole with the side of the slab on 3 sides and the kitchen wall on the 4th) what to seal around the pipe with, and whether the odour may track up the pipe into the kitchen?

 

[ShaunCorbs]

Any pictures of said drain ?

 

[Throwgnilli]

Please see all the pictures attached.

 

[Ben-gee]

It looks like a gully and will probably have a trap before going on to the sewer system.
If unused this trap will dry out and allow smells and harmful sewer gas back into the conservatory.
So you need an air tight seal.
In my own home I would line hole with dpm, blind with sand, partially fill with gravel and top off with concrete.

 

[Throwgnilli]

It looks like a gully and will probably have a trap before going on to the sewer system.
If unused this trap will dry out and allow smells and harmful sewer gas back into the conservatory.
So you need an air tight seal.
In my own home I would line hole with dpm, blind with sand, partially fill with gravel and top off with concrete.

Hi Ben-Gee,

Thanks for the reply, unfortunately the drain is used.

There is no other drainage close by therefore I have to use it to drain the kitchen grey water. It's just how to make it possible so i can tile over it with the recessed cover and how to add the waste pipe successfully.

 

[ShaunCorbs]

Tbh might be best to go to a local metal shop and get them to fab up an alu pan with upstands

 

[Ben-gee]

Oh sorry I misunderstood.

In that case buy a standard internal manhole cover with recessed cover (which you can tile). This will be airtight as the cover screws down onto a gasket (grease this up first)

Chop out or fill in your existing floor to accommodate this manhole.

 

[Throwgnilli]

Tbh might be best to go to a local metal shop and get them to fab up an alu pan with upstand

Forgive me mate, what's one of these?

Get is to sit on the clay gully?

 

[Throwgnilli]

Hi Ben-Gee

Oh sorry I misunderstood.

In that case buy a standard internal manhole cover with recessed cover (which you can tile). This will be airtight as the cover screws down onto a gasket (grease this up first)

Chop out or fill in your existing floor to accommodate this manhole.

Oooh I didn't think of this!

It sounds better than fixing something to the sides of the hole in the foundation.

What do you reckon, use a grinder on it and cut the dimension of the drain into it.

An angle grinder should cut it nicely. What about the kitchen wall? It shouldn't need support there anyway? I'm putting units against that wall.

I reckon I can do that, should be easier once I've got the slab ready for the new tiles and I know how much to recess it by so I can tile it flush.

How about the pipe from the kitchen?

What's the best method of sealing it, to prevent nasty odour entering up that gap through the brick I'll take out in the damp proof course and up the hole I'll have to put into the kitchen slab.

 

[Ben-gee]

Muck in around pipe holes with sand / cement or jetchem if it’s only a small amount. Once dry, you could add a fillet of silicone around pipe if you want- depends on how good your making good is!