drill hole through foundation
#1
03-04-11, 01:35 PM
drill hole through foundation
I need to drill a hole through a concrete foundation under an exterior wall (above ground surface) just big enough to run a garden hose through. I'm not sure, off hand, of the thickness of the foundation wall, but I believe it's probably 8 inches or so at the most. I'd like it to be a relatively clean and round-looking hole with a relatively smooth inside surface. What's probably gonna be a the proper tool to accomplish this without much trouble/effort? A certain size hammer drill with a particular type of bit, maybe? Or something else, any suggestions appreciated.
#2
03-04-11, 05:23 PM
I would stop at one of the rental shops and look at a one day or half day rental of an electric hammer drill. They will have the necessary bit and be able to advise on the correct size.
Bud
Bud
#3
03-04-11, 06:05 PM
Group Moderator
And you want a rotary hammer... not a little 1/2" hammer drill. With the size bit you will be using, they will surely suggest a 1 1/2" rotary hammer.
#4
03-04-11, 06:30 PM
Okay great, thanks. And would I probably want to drill a smaller hole (pilot hole) through first, before drilling the final (probably 1 1/4" or so size hole)?
#5
03-04-11, 06:34 PM
Group Moderator
Originally Posted by sgull
And would I probably want to drill a smaller hole (pilot hole) through first, before drilling the final (probably 1 1/4" or so size hole)?
#6
03-07-11, 03:46 AM
For a garden hose, you probably won't need more than a 7/8 to 1" bit for a snug fit, making sealing from the elements easier. I just did this in a remodel for a raised dehumidifier the customer wanted to evacuate to the atmosphere, and a 7/8 worked fine.
#7
03-07-11, 09:17 AM
Originally Posted by chandler
you probably won't need more than a 7/8 to 1" bit for a snug fit
#8
03-09-11, 03:36 PM
rent a hammer drill,,, you'll only need 1 size bit & ( to me ) placing the pvc liner's a good idea,,, mark your hole & either start from the outside & go all the way thru OR mark both sides of the wall - start outside - drill 5" - go inside & drill 3",,, when the holes approach each other there will be a tendency for the bit to ' grab ' & lock up so watch out. good luck !
the smoothest hole's made w/a diamond core drill but its VERY unlikely you can rent a weka ( brand ) drill.
the smoothest hole's made w/a diamond core drill but its VERY unlikely you can rent a weka ( brand ) drill.
#9
03-09-11, 04:39 PM
Originally Posted by stadry1
rent a hammer drill,,, you'll only need 1 size bit & ( to me ) placing the pvc liner's a good idea,,, mark your hole & either start from the outside & go all the way thru OR mark both sides of the wall - start outside - drill 5" - go inside & drill 3",,, when the holes approach each other there will be a tendency for the bit to ' grab ' & lock up so watch out. the smoothest hole's made w/a diamond core drill but its VERY unlikely you can rent a weka ( brand ) drill.
#10
03-09-11, 05:50 PM
Matching holes from opposite sides of a wall would be near impossible without precise measurements. It would be a PITA anyway. I agree with running a 1/4" or so pilot through in one shot. THEN run your final bit from both ends. You won't have the grabbing, either. Should be a smooth bore if it follows the pilot.
