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Tool Talk Discussion Forum

Core drilling cost

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Mattlt

08-22-2005 06:48:51




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Looking at buying an outdoor wood burning stove, and would like to run the pipes through the concrete basement wall, instead of through the rim joist (Want to keep them below ground).

What can I expect to spend to have the poured concrete wall core drilled? 8" thick, probably need an 8" diameter hole drilled.

Would I be better off just buying a smaller masonary bit, and spend an afternoon chipping away at it?

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Mattlt

08-23-2005 07:06:05




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 Re: Core drilling cost in reply to Mattlt, 08-22-2005 06:48:51  
Thanks for the comments, guys. Looks like I'll be doing it myself.



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upred

08-22-2005 19:39:20




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 Re: Core drilling cost in reply to Mattlt, 08-22-2005 06:48:51  
Do it your self. First get yourself some unistrut that they use to hang electrical conduit,its available at HDepot. Fasten this to the concrete wall with some hilti anchors. Go rent a core drill and attach it to the unistrut and drill away. It sounds a lot more technical than it really is. The only expense is the unistrut and rental. The toughest part is finding someone to help up lift up the core drill so you can mount it to the unistrut. HTH Rick

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dr.sportster

08-22-2005 13:02:26




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 Re: Core drilling cost in reply to Mattlt, 08-22-2005 06:48:51  
About $300-400 on the easr coast for one large diameter hole.Less if you rent the machine yourself but mount it good or it will spin you around also.I would chop the hole at home with my automotive type air chisel then patch around the pipe but Im a cheapskate.



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Can't even use my name

08-22-2005 19:29:00




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 Re: Core drilling cost in reply to dr.sportster, 08-22-2005 13:02:26  
Surprisingly those rotary hammers (at least the Hilti I used) won't twist your arms off like you would think. They seem to have a clutch that slips if you push too hard. I bored a 3 1/2" hole through 8" concrete in about 20 minutes. Drill 1 1/2" then bust out the donut then another 1 1/2" and repeat. Found out you don't push all that hard and it goes faster.



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MAC,IL

08-22-2005 12:36:38




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 Re: Core drilling cost in reply to Mattlt, 08-22-2005 06:48:51  
I think I would get me a good stool, a few good drills and borrow or rent a good hammer drill.
Maybe a 6 pack for the heat. You can bet it will be a lot cheaper.



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T_Bone

08-22-2005 14:18:20




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 Re: Core drilling cost in reply to MAC,IL, 08-22-2005 12:36:38  
Hi Matt,

I would rent a Hilti T17, then use a plastic 6" butter dish top to slide on the bit (keeps water from getting on the T17), then use some water as I was drilling. Place the drilled holes to where you leave about 1/4" of concrete between holes, then chisel the 1/4" out, install pipe then use a sand cement mix as a grout around the pipe.

T_Bone



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