[HH] concrete drilling & radar/x-ray question

[Brough Turner]

There are metal detectors specifically tweaked for detecting rebar and
post-tension cables in concrete.  The cheapest I'm aware of is the Zircon
MT-6 @ ~$125.  It's good to 5-6" depth.  I assume there are more expensive
models that look deeper into the concrete.

You certainly don't want to go near a post-tension cable as cutting such a
cable could seriously reduce the structural integrity of the building.

Thanks,
Brough Turner

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On Fri, Dec 9, 2011 at 10:33 AM, Stephen Ronan <sronan at gmail.com> wrote:

> > I gather a metal detector wouldn't help due to rebar? If you just needed
> > to detect live power lines, there are tools that can help with that.
> >
> > Is the building so old that a review of the blueprints would be
> > impossible or insufficient?
>
> I'm wildly guessing the building dates to around the 1970's. For
> reasons I don't understand the GPR person was very dismissive of
> the possibility that a review of the blueprints would adequately
> address the problem. From what I read, "post-tension cables"
> seems like a significant potential issue; I don't have a sense of
> whether there'd be another way to determine their location.
>
> Stephen Ronan
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