Justin,
Hire a concrete cutting company.
I had to drill a 4" hole through a very tough fireplace hearth (about
14" thick), so I called a few companies to get a quote. They came to the
house, cut the hole exactly where I wanted it, cleaned up afterwards,
and I didn't have to do anything! Saved me lots of time and probably
lots of frustration - they knew exactly what they were doing. Dave's
description of the tool and process are the same as what I saw the
cutting company use.
It cost me CDN$75.00, which is probably the same amount you're going to
pay to rent the thing anyway.
John P. New
On Tue, 2003-12-23 at 21:29, Dave C wrote:
> At 12:48 PM 12/23/2003 -0500, Justin Bedard wrote:
> >My question is: what's the best way to drill a 4" hole through concrete?
>
>
> Everyone else seemed to answer a bunch of questions you didn't ask, so I'll
> answer the one you did. The best way would be to go to a good industrial
> tool rental place and rent a core drill. It's like a hole saw on
> steroids. It has it's own motor and tripod, all you need to add is power
> and water. Rebar and the reinforcing aggregate won't be a problem; the
> diamond edged cutter will cut through them just like butter. When you are
> finished you'll have a perfect hole with practically polished sides, a nice
> concrete core that will make a good door stop, and a big puddle of water
> full of concrete dust. If you hire a concrete cutting company, that's
> exactly what they will do, too.
>
> As for humidity and excess duct length, the other guys had some real good
> advice. I'd listen to it.
>
> Dave C
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