[[email protected]]

Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.

[jthread]

wrote in message
s.com...
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.

you're supposed to cut them with a utility knife and punch it out with a
hammer.

[Manster]

wrote:
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.


"Hole saw"

[jthread]

"Manster" wrote in message
...
wrote:
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.


"Hole saw"

you can do it either way but I've found it easier to punch it with a hammer

http://www.cgcinc.com/pdf/howtos/EDR_6209.pdf

[JB]

On Nov 1, 10:20 pm, wrote:
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.

They have coping saws with round carbide-covered blades.

--Jeff

[[email protected]]

On Nov 2, 8:43 am, JB wrote:
On Nov 1, 10:20 pm, wrote:

Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.

They have coping saws with round carbide-covered blades.

--Jeff


Or how about one of the roto-zip type spiral saws?

[Bob F]

wrote in message
s.com...
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.


Masonry bit? You can use a small one and drill multiple holes for smaller
openings, then break out the middle. Or drill corner holes and use a carbide
blade in a sabre saw. You can use regular steel bits and blades, but they won't
last long. A 1/8" carbide cutting bit in a dremel tool or other high speed tools
works very well. For longer straight cuts, score and break, or used a masonry
abrasive blade in a circular saw (but don't breath the dust).

Bob

[Joe]

On Nov 1, 9:20 pm, wrote:
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.

Harbor Feight has carbide coated hole saws that should make short work
of any of the cement boards. Even diamond in 7/16" and 3/4" sizes for
$3. Cat # 32399-9GBG. Latter ought to last quite a while. HTH

Joe

[DanG]

It is hard on regular hole saws, but they work quite well. It is
often easier to get an oversized piece of scrap pipe, support the
sheet well, and punch the pipe through the sheet with a hammer.
This method works just as well on drywall.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




wrote in message
s.com...
Durock, hardi-backer, wonder board etc. I assume some type of
carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.