Drilling a new drain hole in floor
Drilling a new drain hole in floor
(OP)
A room with 5 inches of slab has no floor drain. A 2 inches diameter drain is needed. Has anyone tried successfully drilling the hole with a 1/3 inch drilling machine bit.. I mean you can't make a perfect hole where the pvc tube could be inserted.. can you just put sealant on the perimeter if it's rough and nonuniform cut?
What technique did you use to put a new 2 inch diameter drain in 5 inches of slab?
Thank you.






RE: Drilling a new drain hole in floor
You could probably rent a core drilling machine pretty cheaply instead. My local steel guy has one he uses for handrails, and if I had known, I would of hit him up.
RE: Drilling a new drain hole in floor
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RE: Drilling a new drain hole in floor
Just buy a 2" concrete coring bit and do it right. I assume this is for an elevated slab?
RE: Drilling a new drain hole in floor
RE: Drilling a new drain hole in floor
You might want to core drill .5 - .75" deep with a bit slightly larger than the drain cover so it can be set flush with the floor. Then drill the rest of the way with a core bit large enough to fit the O.D. of the drain pipe. The O.D. of your 2" pipe may be larger than 2" in dia. core bit. Then you set the drain in grout or quick-set, to be flush with the floor.
RE: Drilling a new drain hole in floor
My only option is to drill a bunch of 3/8" holes around the 2" perimeter. I can't use core drilling machine and I can't even use hammer drill.. just ordinary drill.. you mean it's not possible using ordinary drill (with hammer function)?
RE: Drilling a new drain hole in floor
You must be able to buy a hammer drill somewhere. I have been in some third world places, but there is always a hardware store selling Bosch or Makita tools.
RE: Drilling a new drain hole in floor
problem with hammer drill is it can vibrate the floor or concrete gutter such that it can cause micro molecular detachment between the floor or gutter to the support connecting them. Concrete bond can be attachement by any strong vibrations... that's why I don't want to use a hammer drill or chisel...
RE: Drilling a new drain hole in floor
RE: Drilling a new drain hole in floor
RE: Drilling a new drain hole in floor
Back to the OP's question: For such a small dia hole AND access to a percussion chipping tool, consider the use of a dry-core bit:
For a 5" thick slab (and assuming you don't hit rebar) such a hole would take less than 15 minutes - do it after hours to minimize noise/vibration.
Or wet core it - diamond wet-coring for a 2" hole has minimal (nil?) vibration and very quick with a correctly selected diamond matrix.
RE: Drilling a new drain hole in floor
Good luck!