Hello all, I have a 1896 home. I was looking at the chimney 6 1/2 x 10 1/2 clay tile lined. Should I put a liner in for safety? Its only 10 feet. Would you bring the liner all the way to the stove or thimble? Also can I stuff pink insulation between the liner and clay liner? The chimney is in great shape, tile looks very good. I just want it to be safe. In past post I said it was not lined, it is. Also can I just run the liner up to the existing cap? I was going to use the cap thats on the chimney and run the liner up to it. Thanks for all your help.
6" Liner? For safety? Do I need one?
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CenterTree
Minister of Fire
10feet sounds too short. Can you get it up to 15?
Liner will add a factor of safety, but it should also be insulated.
However you will not be getting a 6 inch insulated liner down a 6.5" clay stack.
The pink insulation is NOT for the purpose you asked about. Do NOT use it there.
Liner will add a factor of safety, but it should also be insulated.
However you will not be getting a 6 inch insulated liner down a 6.5" clay stack.
The pink insulation is NOT for the purpose you asked about. Do NOT use it there.
I have 8 feet of black stove pipe adding to the ten feet of chimney. Is that good enough? Also no pink stuff, why not? Gotta ask. Should I use the pour chimney insulation?
Grisu
Minister of Fire
You need class A chimney for any outside application, not just black stove pipe. There are adapters to go from a liner to class A pipe; check with the manufacturer of the class A you want to use. Since you don't have a lot of room to work with, pour-in insulation may be your best option. Put a 1 gl paint can (diameter 6.5"; HT to Brother Bart for that suggestion) on a rope and lower that down your chimney to see if you even have enough room for a 6" liner. You may need to downsize to a 5.5".
What stove do you want to install? You may need one that drafts well on an undersized flue.
stoveguy2esw
Minister of Fire
with modern stoves the general rule of thumb is that the "cross sectional" value of the flue (square inches of opening) is no more than 2 times the cross sectional value of the flue collar on the appliance on an exterior chimney ( one or more sides exposed to outdoors below the roofline), or 3 times cross sectional value on interior chimneys ( no exposure to outside below the roofline ((NFPA211 chapter 12.4.4)
now a 6.5 X 10.5 flue is 68.25 sq inches of cross sectional value, and a 6 inch flue collar (round) is 6 X pi r squared, or 28.26 square inches of cross sectional value, so it does not meet the requirement if its an exterior chimney but it does if its an interior one.
now a 6.5 X 10.5 flue is 68.25 sq inches of cross sectional value, and a 6 inch flue collar (round) is 6 X pi r squared, or 28.26 square inches of cross sectional value, so it does not meet the requirement if its an exterior chimney but it does if its an interior one.
If the chimney was properly installed with a 2" gap from any combustibles then no need for the liner, but it would be safer to have one. You should not use fiberglass insulation for areas in direct contact with the flue. Use mineral wood insulation (Roxul) or ceramic wool (kaowool) instead. For a small job getting a small amount of kaowool would probably be cheaper and with less excess.
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