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.
Nigel Jones wrote in message ...
email@example.com (Nigel Jones) wrote in message
I built a garage over a sewer and we were told dig the foundations
deep enough to uncover the sewer and then cover the pipework with
"jablite" polystyrene and fill the trench with concrete over the
sewer. We had to dig about 7 feet deep trench and step it back up to
normaldepth it used a lot of concrete. Talk to the building control
dept at the local council ive found them very helpful at queries like
From the chaotic regions of the Cryptosphere, firstname.lastname@example.org
(Nigel Jones) wrote on 13 Jul 2003 15:17:30 -0700:
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).
"You know, I'd rather see this on TV,
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