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 Post subject: Drain Cover Query
PostPosted: Tue May 29, 2018 10:24 pm 
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Hi all,

I hope this is the correct place.

We are wanting to lay some patio or gravel in the front garden however there appears to be a drain cover in the ground. I'm completely new to all this type of thing so I have no idea what it is and its purpose.

I imagine cutting around patio slabs is somewhat tedious and I would not want to block access.

I have attached some pictures. Any help/advice would be great!ImageImage

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 Post subject: Re: Drain Cover Query
PostPosted: Wed May 30, 2018 12:42 am 
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wheres the nearest manhole cover?
the letters cant be clearly seen but it could be an inspection chamber or clean out cover.
if you dig down and expose below the cover youl see what material its going into eg CI or clay?

your original mechanical DPC is in line with this cover thing and in line with the top of the gulley dish, which makes the high level injected chemical DPC a nonsense.
its also a nonsense because whats the purpose of injecting the outer skin of a cavity wall that already has a DPC?
maybe the cavity is blocked but injecting wont help a blocked cavity.

i think that in the past the ground level was to high and bridged the mechanical DPC.
ground level should be about 150mm below the mech DPC



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 Post subject: Re: Drain Cover Query
PostPosted: Thu May 31, 2018 5:17 pm 
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Hi there,

Have heard of similar problems with extensions, where the builder has created a trap door sort of feature that allows access to the drain but isn't noticeable to the naked eye, hard to see how that might be of any use to you but it reminded me of it.
As for paving over it, I wouldn't pave over it as even if the drain is unused if you were to sell your house and the buyers were to have a drain survey before buying they could get a reduction on the price of your home due to you failing what's known as a smoke test. The person carrying out the survey would fail you and may even mistake the problem for faulty drains. Try and this issue sorted as soon as possible to save yourself the most amount of money possible, sorry if this hasn't helped!


Kieran



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 Post subject: Re: Drain Cover Query
PostPosted: Thu May 31, 2018 8:30 pm 
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Dale wrote:
I have no idea what it is and its purpose.


My money is on it being a stop tap.
You can probably lift out the centre.



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