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Need to run pipe thru cinder block

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Topic by sikrap posted 09-30-2009 03:21 AM 16697 views 0 times favorited 12 replies Add to Favorites Watch
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sikrap

10 posts in 5067 days

09-30-2009 03:21 AM

Hi, I need to run a piece of 1 1/2 inch conduit thru my cinder block foundation. I have heard that the easiest way to do this is to simply whack the block with a hammer (on a core, of course). My original plan was to use a masonry bit on my drill and just drill small holes around a circle on the block. I’m all in favor of “easy”, but this method just sounds dangerous and I’d rather not crack the blocks. Does anyone out there have an idea for a simple way (that’s safe)? Thanks!!



View Todd Thomas's profile

Todd Thomas

735 posts in 5159 days

10-01-2009 12:08 PM

Both of the methods you have will work, I’m a hammer the block kinda guy, fast and easy…you could get a hole saw with a masonry edge and drill it out..the hole saw will not be cheap and by the time you put it in your drill you could have hammered it out.:-) Good luck…let us know how it goes

-- Todd- Oak Ridge, TN

View a1Jim's profile

a1Jim

160 posts in 4866 days

10-08-2009 01:37 AM

Like Todd says either will work but I’m a drill first guy I feel there’s less chance of breaking the block. You could also rent a drill with the correct size drill bit for the pipe.

-- a-1contractor.com

View BTKS's profile

BTKS

39 posts in 4976 days

10-08-2009 03:18 AM

Masonry scares me, so I recommend drilling. Slower but I assume this is your house and not a job with a crew waiting on you. Either way, good luck. BTKS

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BillyJ

253 posts in 4916 days

10-09-2009 09:08 PM

I don’t know if you already have the job done or not, but I would use a carbide grit coated hole saw and drill it out. You can pick them up at HD or another big box store for under $15.

I assume you are going to put some caulking or fire-stop material around it. If so, you could have a a larger hole and caulk around the pipe.

Tell us what you end up doing and the results.

-- No matter how many times I measure, I always forget the dimensions before I cut.

View sikrap's profile

sikrap

10 posts in 5067 days

10-10-2009 01:32 AM

Decided to go the drilling route. I drew a circle on the block and used a 1/4” masonry bit to drill several holes around the perimeter. The inside wall of the block was easy, but going thru the outer wall was a bit tougher. The hole actually came out relatively round and was just large enough to get the 2 cables thru. I then applied a liberal amount of hydraulic masonry patch to both side of the block to (hopefully) stop any water from coming in. That was actually the most frustrating part. Its amazing how fast that stuff sets up!! I mixed it up outside and immediately patched he outside hole and by the time I got downstairs, the stuff had already set. If nothing seeps in, I should be all done. Thanks everyone for your input!!

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