Do I need a block-off plate with a heatform fireplace and new wood insert?

[wildwildwest]

Thanks for your input. DH will sawzall the middle tube out to accomidate the new flex liner going into the existing chimney. I keep wondering about the diagram on heatform article redlining the block off plates. If we need one, does it go above or below the heatform tubes?

Appreciated

 

[bholler]

Yes you should put one in and it should be below the tubes we also cap off the cut tubes with some sheet metal before covering them up

 

[wildwildwest]

Yes you should put one in and it should be below the tubes we also cap off the cut tubes with some sheet metal before covering them up

Is this suitable?
http://www.homedepot.com/p/Master-F...vanized-Steel-Flat-Sheet-GFS24X361P/202191776

Can I use a scrap of the above to cap of the cut off tube?

thanks

 

[bholler]

That should do i would get some roxul to insulate above it to. Are you insulating the liner?

 

[wildwildwest]

Yes he is insulating or using an insulated liner (short on the terminology lol). Speaking of the insulated liner, does it go from the flue shelf to the top of the chimney? (there is a 3' metal pipe extension on top). He heard something about leaving a foot or two at the top without insulation.

 

[bholler]

No insulate as far up as you can the top is where you will get the most buildup especially if it is uninsulated