Do i need an inspection chamber?

[grahamA]

I'm currently building an extension which will have a utility room housing a sink and washing machine. My intension for drainage is to install a 110mm soil pipe through the slab re-connecting it to an exisitng clay pipe (about 5 metres from the property) within my property boundary which runs into a combined sewer outside the property bounadary. Given where the exisitng clay pipe is located, it will be possible to connect directly onto the pipe (using the correct coupling) without any significant change of direction (less than 10 degrees). My question there is, is there any requirement / need to install an inspection chamber at this re-connection given it is a striaght coupling? I intend to install traps under the sink etc and an air admitence valve internally so assume this will solve the venting and smell issue? Is there anything I am missing however?

 

 

 

 

[Nickfromwales]

38 minutes ago, grahamA said:

I'm currently building an extension which will have a utility room housing a sink and washing machine. My intension for drainage is to install a 110mm soil pipe through the slab re-connecting it to an exisitng clay pipe (about 5 metres from the property) within my property boundary which runs into a combined sewer outside the property bounadary. Given where the exisitng clay pipe is located, it will be possible to connect directly onto the pipe (using the correct coupling) without any significant change of direction (less than 10 degrees). My question there is, is there any requirement / need to install an inspection chamber at this re-connection given it is a striaght coupling? I intend to install traps under the sink etc and an air admitence valve internally so assume this will solve the venting and smell issue? Is there anything I am missing however?

Hi.

Any T connection to an existing pipe run is called a "branch", and regardless of pitch it is still a "change in direction" so will require either;

1) An IC to allow rodding access at said branch

or 

2) Accessible rodding access inside the house where the pipe terminates vertically, immediately upon entering the dwelling.

 

The latter is quite undesirable, due to having to create access for rodding / maintenance, and I would certainly go for adding an external IC. Ultimately this will be down to your building control officer's decision, and not yours or 'ours'  

[grahamA]

Thanks for your reply Nick. There won't be a T connection as there is no change of direction (see image below).

 

 

[ProDave]

So how will you rod it when blocked?  You have the hole in the ground, just put an IC in there, not worth arguing why not to.

[grahamA]

Hi Dave, thanks for your response.

 

I'm not trying to argue i'm just trying to understand why It needs one. Why would it block up at that connection, there is no change of direction? I don't see how this would be any different from coupling one pipe to another and practically you wouldn't put an IC at every coupling point if there is no change of direction.

 

I would rather not put an inspection chamber there at the moment as the space is unlevel and i have plans to relay as a driveway in the future there. I have read that any IC used in a driveway needs to have a concrete base and concreted in. Therefore as you can imagine i'm not keen to do this if its not necessary.  

[ProDave]

There will be a small change of pipe diameter.  

 

If you don't put an IC there, how far along the run is the next one?

 

I would just do it, because it is so easy and you can never have too many.

 

BC in Scotland will probably insist on it being pressure tested.  More reason for an IC so they only test the new bit.

[Dave Jones]

if no change of direction you dont need one. BUT you are going to be using a Y which means you need the ability to rod the new section. How will you do that without a chamber ?

[grahamA]

The length will be about 5 metres. Interesting point about pressure testing. 

[grahamA]

11 minutes ago, Dave Jones said:

if no change of direction you dont need one. BUT you are going to be using a Y which means you need the ability to rod the new section. How will you do that without a chamber ?

 

Hi Dave, by "Y" do you mean a 45 degree junction / branch? I intend just to use a clay adapter with jubliee clips. 

[Dave Jones]

ah so the previous run is now redundant and being replaced with your new pipe? is there a manhole downstream that you can use to rod ?

[grahamA]

Hi Dave, Yes so you are correct the previous run is redundant and will only be connected to this new drainage. 

 

Yes there is one downstream outside the property. 

[Dave Jones]

then crack on!

[saveasteading]

Your choice. You can't be made to put in a chamber.

But every drain has a risk of blocking. I've seen many where there was no obvious reason. Plus you have a junction  and risk of bits building up.

As you have the hole, a rodding point would be easy and save a connector.

As to concrete, for a drive the loading is low, and it would be a short riser, so a few shovels of concrete around the plastic riser will be enough.