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Old 02-19-2011, 10:42 AM   #1
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drill 2.5" hole through 10" concrete hole


I want to drill a 2.5" hole through a 10" internal concrete wall for my 2" washer drain.

I did some research. I think I need this core drill bit: SDS Carbide Masonry/Concrete Core Drill Bit 2.5" x 6".

Can I use this Bosch 11255VSR BULLDOG Xtreme 1-Inch SDS-plus D-Handle Rotary Hammer with this SDS-Plus Shank for Carbide Tipped Masonry Core Bits plus above Core Drill Bit to do the job?

I would like to buy a tool not rent one because i would like to own a tool for future use. I am in the process to finish my basement. I can see i will use this tool to drill holes to anchor frames to concrete in many places.

thanks,

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Old 02-19-2011, 07:12 PM   #2
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drill 2.5" hole through 10" concrete hole


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Originally Posted by diy001 View Post
I want to drill a 2.5" hole through a 10" internal concrete wall for my 2" washer drain.

I did some research. I think I need this core drill bit: SDS Carbide Masonry/Concrete Core Drill Bit 2.5" x 6".

Can I use this Bosch 11255VSR BULLDOG Xtreme 1-Inch SDS-plus D-Handle Rotary Hammer with this SDS-Plus Shank for Carbide Tipped Masonry Core Bits plus above Core Drill Bit to do the job?

I would like to buy a tool not rent one because i would like to own a tool for future use. I am in the process to finish my basement. I can see i will use this tool to drill holes to anchor frames to concrete in many places.

thanks,
Where does this pipe go when you drill the hole? Cesspool? Sewer connection?
Ron

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Old 02-20-2011, 06:02 AM   #3
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drill 2.5" hole through 10" concrete hole


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Where does this pipe go when you drill the hole? Cesspool? Sewer connection?
Ron
it will connect to a 3" Sewer pipe.
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Old 02-20-2011, 08:19 AM   #4
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drill 2.5" hole through 10" concrete hole


I drilled a 2-1/2" diameter hole through my 10" concrete wall for a sump pump connection. I rented an electric Bosch rotary hammer (I do not remember the model number) with a 2-1/2 diamond coring bit. The process was relatively slow, but quite effective. The stand was critical, the tool I used had enourmous torque, enough to take your arm out of the socket if you tried to hold it by hand. The bit also had a habit of catching if it was not held exactly perpendicular to the wall, then the drill would start to rotate the stand. I had to be very careful about that, it happened several times.

I know there are several manufacturers of rotary hammers, I can't comment on which ones are better. I can say that I filled the space surrounding the pipe with expanding foam, and sealed the face with about a 1/2 inch of hydraulic cement. This has worked well for many years now.
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