Building a garage above public sewer (UK)
 

Not sure about the depths, but building on a 6" thick slab would only
require minimal excavation.Don't plan on a pit! Alternatively for a single
garage, you could use pile foundations in some form or other with a
reinforced concrete link frame to build walls upon. Hope this helps.
Regards
Capitol

Nigel Jones wrote in message ...
I have submitted plans to build a single garage above what has now
turned out to be a pair of sewers 1m apart
- 300mm surface water
- 150mm waste

The 150mm waste in particular appears to run damn close to directly
underneath, and parallel to where one of the garage walls was
proposed, the other will just be underneath the main part of the
garage. There are no manhole covers under the proposed garage, the
nearest being approx 1.25m away from the garage rear wall. There is
only approx .5m space outside the proposed garage that is still our
land.

Currently a car is parked here. We had wanted a brick garage. This
requires reasonable foundations and I'm not sure whether we have any
realistic options especially as the pipe is parallel

We alternatively are considering a wooden built garage to propose as
the construction is lighter. Would this make things smoother?

The invert of both is listed at around "25" - is this 25" deep
perhaps? I have no idea!

An alternative is of course to entirely rejig the plans....

What are the realistic chances of being permitted to build here - we
would have to submit an application to Southern Water if we decided to
try.

What else should we consider/do/propose/find out about!

Thanks
Nigel
nigel at planetf1 .... .worldonline.co.uk

Building a garage above public sewer (UK)
 

Building a garage above public sewer (UK)
 

From the chaotic regions of the Cryptosphere,
(Nigel Jones) wrote on 13 Jul 2003 15:17:30 -0700:

I have submitted plans to build a single garage above what has now
turned out to be a pair of sewers 1m apart
- 300mm surface water
- 150mm waste

It's down to the water company. IMHO, there's a chance that you may
be allowed to build over the 150mm diameter sewer, but that would
almost certainly not be the case with the 300mm. With the both in
combination, it looks even less likely.

If it were able to be built over, the foundations would have to be
excavated to a depth of 150mm below the invert of the sewer. Piling
would be problematic, as they would have to be augered rather than
driven, ruling out a mini-piling rig. If the sewers are very deep (I
can't see the depth being 25", that's only 635mm, which wouldn't be
enough cover on a 300mm pipe), a raft would be a better prospect, as
the total additional load on top of the pipe would be quite low.

One of the water company's concern is gaining access in the future, so
they may well object to a timber garage also (this would have other
problems in terms of Building Regulations in relation to combustible
material less than 1m from your boundary).
--
Hugo Nebula
"You know, I'd rather see this on TV,
Tones it down" - Laurie Anderson

Building a garage above public sewer (UK)
 

"JD" wrote in message
. ..
If these are just srvicing your residence then you may build over them as
long as you take the necessary precautions. I can't say what is required
for
your foundation because I have no idea what your frost line is or what
your
code says. You will likely have to frame it so that the wall directly
above
an parallel to one of the pipes is non-bearing.

If the lines are for public use (mains) then you should have an easement
on
your property and will not be allowed to build.

As always, there may be exceptions.

If there is an easement, you should talk to the City Engineer. You may be
able to build over it. In the US, the owner is liable for the cost of the
easement owner accessing the underground utilities. It could mean your
garage is damaged when the sewer is repaired some day and you would be
responsible for the added cost of them dealing with your garage as well as
the cost of repairing the garage. However, with no manhole nearby, the City
Engineer can work with to determine if you can built and what restrictions
and risks you will be facing.


Sincerely,


Donald L. Phillips, Jr., P.E.
Worthington Engineering, Inc.
145 Greenglade Avenue
Worthington, OH 43085-2264


(remove NS to use the address)
614.937.0463 voice
208.975.1011 fax

http://worthingtonengineering.com