In the Spring I need to remove about an 8"x8" chunk of concrete from the
edge of a garage foundation for drainage.
Can a "hammer drill" be used to core out some adjacent holes to facilitate
knocking this out?
How does one work? Does it drill? Or hammer? ..or does it do both at once?
If it does both at once, is it hammering while the drill bit is still in
Or do you alternate a drill bit with some kind of chisel bit?
Advise and thanks.
A hammer drill does just that, twisting and moving up and down slightly at
the same time.
A rotohammer on the other hand has a position that just hammers, the chisel
bit. Chisel bits and rotation could be a recipe for disaster.
I would suggest a bunch of 1/4 inch holes all around the area that you want
to remove. Holes almost touching. Then a sledge hammer to break it out. If
you drill all the way through the concrete it should come out pretty easily.
UNLESS there is steel reinforcement. Might be better to get a cheapy skill
saw and a fiber blade(s) and cut as much as you can with that before you do
the drilling. The skill saw will do the cutting except in the corners unless
you can over cut.
I had to chisel out some concrete for similar purposes and found an air
hammer and straight chisel worked
GREAT. it chewed through the concrete like cheesecake! wear GOOD eye
protection and cover all open
skin cause the flying debris hurts....
I was able to chisel out the area I wanted literally in minutes...and you'll
get a feel for it and be able to achieve
a nice smooth finish too!!
I used a rental center's rotohammer with a 1" bit. I had to cut AN ENTIRE
doorway into a 12"-thick basement wall back in Massachusetts. One comment:
the age of the cement I am told makes a huge difference in the ease of
drilling through it, as well as the brittle/breaking you'll see. I drilled
perhaps 100-125 holes in a full day and away I went! Worked perfect.
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