Custom Core Drilling for an Inserta Tee Install in St. Paul

Not every job fits a standard playbook. This one in St. Paul required a special-order 12 3/4" core bit - not something you just grab off a shelf. When the spec calls for a specific size, you source what's needed and get it done right. No shortcuts.

The goal here was to core through an existing large-diameter concrete pipe to set an Inserta Tee connection properly. That means a clean, precise hole - not oversized, not undersized. A sloppy cut creates problems downstream, so the tolerances matter more than most people realize.

That's where core drilling really earns its keep. The rig gets positioned directly against the pipe wall, and the diamond bit does the work cleanly through reinforced concrete. It's controlled, accurate, and keeps the existing pipe structurally sound while opening up exactly what's needed for the new connection.

Once the core is pulled and the opening is clean, the Inserta Tee seats the way it's supposed to - flush, sealed, and ready to handle flow. The crew gets the lateral tied in without compromising the mainline. That's the whole point.

This kind of planning - knowing in advance that a special-order bit is required, sourcing it before the crew ever shows up on site - is what keeps a job moving. Downtime costs money. Showing up prepared is half the battle, and it's something we take seriously on every call.