I don't know what "they use, but we used a hammer drill and chisel. Made a
series of holes with a 1/2" bit they a chisel to take the rest out.
If you know the proper formula for size and placement, I suppose you could
use explosives too.
hammer drill works fine although a diamond core bit leaves a smoother
rounder hole, which really doesnt matter.
are you certain your chimney is lined, in good condition, and large
enough to accept a 8 inch pipe?
my bad on the size:(
however if your converting to a wood stove has the chimney been
inspected? preferably by a camera......????
know someone who proudly added a wood stove to his old furnace
chimney, after he got his new high efficency furnace:) planning on
cutting his gas bill dramatically:)
the chimney was lined with ceramic tiles so he wasnt concerned:)
till the house caught on fire:(
Turned out some joints in the ceramic liner were bad:(
89 grand later all is well, insurance paid but added a rider no
coverage for wood stoves or wood burning fireplaces. adding either is
possible at a added cost of 700 bucks per year to get the exclusion
cost him about 5 grand out of pocket, his homeowners wasnt the
figured your better off knowing .......
Technically and in many areas, legally, you cannot add an additional
appliance to a chimney that is in use by another appliance. One stove
interferes with the draft of any additional stoves plus the capacity of the
chimney may be overloaded. Each device requires its own chimney.
If the chimney is lined with glazed clay pipe it may be impossible to break
into it without shattering the brittle clay liner unless it is cut with a
What I was more inclined to do was build new chimney for my garage and
was wondering if there are chimney blocks and tiles with holes already
in them. Otherwise I have to destroy a new chimney with hammer drills
It is a safety, not an operational concern. It you have a gas appliance and
for some reason the flame goes out and gas starts going into the chimney and
the wood stove is going at the same time, you can guess the result. Or the
oil burner quits and you press the reset button a hundred times.
I suppose most people think that safety rules are created on the
assumption that most people are complete idiots when it's more likely
that some idiot got an engineering degree then a job with a state making
The big job is getting through fast, sealing it back with mortar is
easy, depending on what its made of and how thick it is determines
what you need, quickest is rent a small electric demolition hammer if
its brick or stone and very thick, a few couse brick maybe a hammer
drill and chisel is all you need, some chimney fireplace brick is
super tough and will be hard even with the best demolition hammer. My
fireplace was about impossible to drill into with a 1/2" 120v Porter
Cable Hammer drill and new bits.
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