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Xringer · 10-23-11, 08:52 PM

Too bad those blocks are so hard to drill. When I want to install something outside
the house that requires a hole-in-the-house, I always drill a small test hole.
One that I can patch up, if it turns out to be a bad spot..
For thick walls, I use a steel rod (Music wire?) with a flatted and sharpened end, as a long drill bit.

Maybe you could use small masonry bit to probe for the cavities inside the blocks.?.

1/4 In. x 13 In. Double Flute Masonry Bit-14044 at The Home Depot

A few 1/4" holes wouldn't be too hard to patch up..

10-23-11, 08:52 PM	#28
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Too bad those blocks are so hard to drill. When I want to install something outside the house that requires a hole-in-the-house, I always drill a small test hole. One that I can patch up, if it turns out to be a bad spot.. For thick walls, I use a steel rod (Music wire?) with a flatted and sharpened end, as a long drill bit. Maybe you could use small masonry bit to probe for the cavities inside the blocks.?. 1/4 In. x 13 In. Double Flute Masonry Bit-14044 at The Home Depot A few 1/4" holes wouldn't be too hard to patch up..