Mini inspection chamber extension.

[Borehole]

According to Building Regs H1 Table-11 2015 approved doc, our 800mm deep mini Inspection Chamber (with a +-32cm internal diameter) should not be deeper than 600mm. I believe this is to ensure effective rodding from above.

Q: Could I bring this into compliance by removing the top 200mm riser section and concreting a 450mm IC barrel around it with a 450mm cover at original ground level? Rough sketch attached.

This would make the mini IC 600mm (invert to cover) but the "ground level" immediately surrounding it would only be a +-12cm wide ledge. Don't know if this would comply with regs.

Thanks,

ian

 

[Agile]

Maybe you need to consider who fitted it and how long ago.

It is only a small amount outside the specifications and not something that I would expect would upset anyone.

The regulations are written to be complied with but there are no drainage police going round with flashing blue lights about to arrest you.

The only exception is a common infringement in bathrooms. On a Thames Water training course we were told that if we ever saw that infringement then we should report it to a hotline immediately.

 

[Borehole]

Hi Agile, thanks for your response.

I had it installed in May 2011 by a recommended specialist. Later that year it transferred to the Water Company together with the shared lateral drain.

If ever we do call Severn Trent for a blockage, it would be bad if they could not rod due to the excess depth.

Regards, ian

 

[thomp1983]

Severn trent would find a workable solution, they'll have inherited far worse setups when everything was adopted.

 

[HERTS P&D]

If ever we do call Severn Trent for a blockage, it would be bad if they could not rod due to the excess depth.

Jetting is the way to go, I've jetted drainlines that were 12 metres deep.

Andy

 

[Borehole]

Thanks Andy and Thomp, I get the drift. Will probably leave it as is. Cheers, ian

 

[Hugh Jaleak]

I don't see it being an issue, it's common practice on Developments now to use 4 and 6" Preformed Chamber bases at deep Invert levels, then build the Chamber up using 1200mm Diameter Concrete rings.

 

[Borehole]

Thanks Hugh,

I'm grateful for the invaluable experience and knowledge all you guys have so kindly shared.

Severn Trent will be inspecting soon due to my complaint about the neighbour connecting a WC into the shared open bottle gully on our boundary, believe it or not, just outside our kitchen window.

If they do challenge the inspection chamber depth, I should be able to lower and extend it as previously planned.

Cheers, ian

 

[Hugh Jaleak]

Severn Trent will be inspecting soon due to my complaint about the neighbour connecting a WC into the shared open bottle gully on our boundary, believe it or not, just outside our kitchen window.

Never mind Severn Trent I'd be getting Building Control and Environmental Health from the Council onto that. Gully would normally do one property, so I'd expect that section to be classed as Private, ST wouldn't get involved until it joins the main run.

Strictly against the rules, the mind boggles.....