On Wed, 30 Mar 2016 19:03:12 -0000 (UTC), Mike
wrote:

I have this brick/tile stuff that is structural for this build. The
building is 70+ years old. Home Depot has a bit that I can bore
through the brick/tile that is just a hair over 4" OD. I have a
scrap of steel pipe I want to put through the hold to reinforce the
brick/tile after I bore the hole. This steel pipe is about 4.5" OD.
I can rent the bit and drill from Home Depot to make the initial
hole, but still need to increase the hole diameter for the steel
pipe. I thought of using some sort of grinding stone to make the
hole bigger for the steel pipe. Is there a better way to make the
hole or to widen the hole for the pipe?

Once the pipe is in the hole I plan to concrete around the pipe and
fill the voids in brick/tile. Once the concrete (Sackrete Sand Mix)
hardens I'll run a 3" schedule 40 septic pipe through the steel and
spray foam the space between PVC pipe and steel pipe.

TIA

Mike

I'd first see if you can get a 5" bit. Maybe even a 6" which would be
common for heating ducts. You can always mortar it in. Thats better than
trying to break it out with a chisel, which could damage the tile.
Grinding will probably work, but it will be real slow and likely eat up
several wheels.

If the tile is that hollow red clay type of stuff, it may grind fairly
easy. It depends on the material, and whether it's solid or hollow.

You could probably just run the PVC by itself, and mortar around it
also. You dont need more than that to reinforce the wall.

If you use foam around it, I'd buy the rodent proof type so mice dont
chew it, or even poke some metal screen in the hole before the foam.