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Old 06-04-2013, 10:41 PM
OhioMowerGuy OhioMowerGuy is offline
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Core drilling curbs

Hey guys I was wondering whats the best way to drill curbs for downspout lines... 3'' holes. Will a heavy duty rotary hammer work? Im guessing a diamond coring bit on a dedicated coring drill would be best. Ive never drilled one before. It would be nice to get a rotary hammer for a mulipurpose tool, but if im gonna be in the business I want the right the right tool for the job. Any tips or advice would be appreciated.
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Old 06-05-2013, 06:00 AM
Impact-Vector Impact-Vector is offline
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Try rent before you buy.

I think a hand held sds drill would work. 3" hole isn't massive.

What's the material? Granite or concrete? One concern is drilling dry. Look for something that keeps the bit wet or you might land up buying a lot of bits!
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Old 06-05-2013, 07:11 AM
OhioMowerGuy OhioMowerGuy is offline
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Concrete. I thought about renting but that's $100 towards owning the tool
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Old 06-05-2013, 07:20 AM
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alldayrj alldayrj is offline
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I like my bosch but i havent driled any holes that big. It also fills a great void when the jackhammer is too big and awkward
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Old 06-05-2013, 08:22 PM
excav8ter excav8ter is offline
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What size pipe do you plan to use for the down spout? A 3" hole MIGHT allow a 2.5" pipe through....aren't most down spout lines 4"? I run 4" minimum....depending on how many down spouts and the square footage they are draining.
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Old 06-05-2013, 08:23 PM
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4 seasons lawn&land 4 seasons lawn&land is online now
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I think the hammer drill might be a little tough with that. I have a Husqvarna DM core drill that Ive done 2" holes with by hand. 3 inch you might still get away with doing by hand but you really need downspout holes to be plumb so your better off putting it on a drill rig. The handhelds will run you around 1500 and the larger drill rig ones double that.
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Old 06-05-2013, 10:23 PM
OhioMowerGuy OhioMowerGuy is offline
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I'm running a 4" line but it'll have to be reduced down to 3". If I put 4" through the curb there wouldn't be much curb left at all. I read somewhere to cut the hole in a piece of 2x6 and clamp it to the curb to keep the drill from jumping around, sounds like a good idea. Also, is there rebar or wire in curbs? That could be a problem. Thanks for the replies
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Old 06-05-2013, 10:33 PM
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Junior M Junior M is offline
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I've drilled wire and rebar enforced gunite before with a core drill.. Just jumps a little more..
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Old 06-06-2013, 03:11 PM
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SiteSolutions SiteSolutions is offline
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You could saw cut two cuts with a demo saw about 5-6" apart, knock the curb out with a BFH, lay the pipe through the hole, and use a 40 lb bag of quickrete to pour the curb back in place over and around the pipe... probably do all that in the time it would take to core drill the hole.
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Old 06-06-2013, 05:42 PM
excav8ter excav8ter is offline
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Quote:
Originally Posted by SiteSolutions View Post
You could saw cut two cuts with a demo saw about 5-6" apart, knock the curb out with a BFH, lay the pipe through the hole, and use a 40 lb bag of quickrete to pour the curb back in place over and around the pipe... probably do all that in the time it would take to core drill the hole.
I have seen it done this way too. IMO...this is the best way, primarily so the OP doesn't need to reduce pipe size in the direction of flow.
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