Cutting hole in cement block chimney.

Re: Cutting hole in cement block chimney.

PostBy: samhill On: Sun Oct 06, 2013 8:05 am

If you have access to a core drill I would go that route & it shouldn't do any damage to the block in any of your locations. Keep in mind that as you hit the hollows it will want to throw the drill off a bit so if you haven't used one or if at an awkward stance a jig would help, I always use a bit of a water spray to keep dust down as well as cool & lubricate the bit, you should be able to feel when thru the block but a line the depth of the block is a good idea as well (another reason to keep dust down) it will get dusty.
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Re: Cutting hole in cement block chimney.

PostBy: waldo lemieux On: Sun Oct 06, 2013 11:26 am

:? How do you move up horizontally? Rent a core drill that bolts right to the chimney . center the hole on the flue liner horizontally , put it where you like it vertically , use water and ef the sand.Thirty minute job max.It'll take longer to pick up and return the drill than doin the job.
waldo lemieux
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Re: Cutting hole in cement block chimney.

PostBy: McGiever On: Sun Oct 06, 2013 7:57 pm

EarthWindandFire wrote:I went and looked at the core drill at Home Depot. I might have to build a jig to hold the drill steady and straight while drilling. The chimney does have a clay flue liner. I'll try to stop the drill when I hit the clay, then I'll finish the hole in the clay with my Dremel. But, back to original post, which hole location would be best for maintaining strength, especially with so many intersecting mortar lines involved?

Forget the Dremel...diamond core drill will cut through clay liner like butter. ;)

Were you looking at the hand held core drill?
There is another drill w/ a base that gets mounted to surface and works like a drill press to guide the bit...may have to go elsewhere if not at Home Depot.
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