insulating masonary chimney

[cyclone]

Can you insulate a masonary chimney that has a clay flue liner that is already erected?

 

[daryl]

You can insulate the outside of the chimney with a wooden chase around it but you must keep your clearances to the brick work 2". Or you can run a SS liner with a insulation wrap down your flue.

 

[cyclone]

Questions is can I get a six inch flex liner that is insulated down the clay flu tiles?

How much room do I have to play with in order to get the insulated liner down the chimney? How big does the square flue terra cotta tiles have to be?

 

[daryl]

You would have to measure your flue tiles. 6" flex with insulation wrap is about 7.5". If you ovalize the liner you can get it down to about 6". If you ovalize it has to be a straight shoot no offsets in the flue. Dura Vent also makes a pre insulted liner if you go on their web site it will tell you the diamater.

 

[oconnor]

Remember that you don't have to keep the clay tiles in place - your liner and insulation replaces them. In fact, many new brick flues are built exactly that way, with a brick chase and stainless liner with insulation.

 

[vvvv]

dead air space between ss liner & tile can provide insulative value

 

[oconnor]

dead air space between ss liner & tile can provide insulative value

It can in theory, but in the reality of bulding codes, you need either airspace outside the brick chase between it and combustibles or insulation around the liner.

In all cases, follow the liner instructions.

 

[gpcollen1]

dead air space between ss liner & tile can provide insulative value

Maybe you can calculate it but it is really of little to no value.