If you do any amount of cabling in commercial buildings, you can’t avoid pulling cables through masonry applications. Typically you will need to drill anywhere from a 1″ to 4″ hole to accept a sleeve of some kind be it a piece of EMT conduit or a pass through device. You have several choices. Number one, you can hire someone to core the holes for you. If there is another trade already coring through the wall, cost may not be so bad. If you have to hire a coring contractor, it can get expensive. There are times when hiring someone is the best way to go. If you have a lot of holes, bigger holes or you have post stressed concrete, you may be better off passing the liability and cost to a concrete cutting coring firm. Choice number two involves poking a bunch of smaller holes with a hammer drill and then breaking out the center. There are times where this may get you buy, but consider an easier option first. SDS core bits. Most contractors today utilize SDS hammer drills. These hammers can also perform coring jobs quite well. A standard SDS hammer like a Hilti TE15 or Bosch 11255 hammer should be able to 2-1/2″ core with relative ease. The core bits used for these types of hammers are carbide tipped and have a thin wall. This thin creates less resistance than what you may find on bigger core bits making for an easy drill.
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