Sounds like a wager to me i tho.
How to cut a hole in a concrete roof tile.
Set the clay stone or concrete roof tile on a flat and stable surface.
I showed these oversized 12mm roof bolts to some friends who said i wouldnt drill concrete roof tiles without breaking a few.
Score the front of the tile along the circle guideline with the diamond blade.
Photos 1 3 show how to cut a hole for a shower valve.
Size will work for most applications but measure your valves to make sure.
Step 1 mark the concrete roof tile along the line to be cut by scoring the tile with a screwdriver or utility knife.
Many tile jobs require you to cut one or more large round holes for floor drains or shower valves.
Turn on the grinder and guide it back and forth along the scored line until you pass through the tile.
It has carbide grit embedded in the rim that allows it to cut into vitreous tile.
Step 4 align the grinder cutting wheel with the scored guideline.
The easiest and neatest method is to buy a 1 1 4 in.