Lining an old chimney

[kevinjohnsonmbe]

Time for a liner down the old chimney since we have the scaffold in for another job. Any thoughts / experience of the pro's / cons / cost difference between stainless steel liner and a concrete / pumis void filling lining system??

 

Anyone done one recently?? What sort of cost is the concrete / pumis system??

[Chopper Edoff]

Just use a flexible liner, go for the heavy guage one (904) and pour in from the top vermiculite trying to keep the liner centred. The vermiculite insulates the liner thus keeping the flue gas temps up, causing a good draw and stops soot condensing out. The 904 flue liner has a 20 year g-tee and by using loose vermiculite makes replacemnet very easy. I prefer this method because it's cheap and imho better than other systems especially on old chimneys, I have seen damp ingress through solid flue systems in unused flues.

[kevinjohnsonmbe]

We've got a local outfit, well established and respected saying flexible is no good and they won't do it.

 

They use a NACE cast in situ concrete lining system - NACE

 

Seems pricey though

[Mull]

Put a liner down and mix vermiculite with sand and cement, then when liner is goosed you still have a flue.