Chimney volume: Playing with some numbers

 
CapeCoaler
Member
Posts: 6515
Joined: Sun. Feb. 10, 2008 3:48 pm
Location: Cape Cod, MA
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove

Post by CapeCoaler » Thu. Sep. 10, 2020 1:54 am

Any of these products will insulate well. The only thing that makes Thermix (or any of its competitors special) is the addition of some Portland Cement, which you could do yourself (anywhere from 6:1 to 10:1 BY VOLUME, I believe). You wet it slightly (not like concrete) and pour it down just like the rest.

The advantage of this is it holds the liner centered in the chimney, giving it a little rigidity. It also keeps most of the water out - vermiculite and perlite straight can absorb a lot of rain if there's a leak in the top cap somewhere. Neither of these things is harmful, but they do reduce the insulating value.

If you want to take it out you still can. It's pretty weak - you can shake it about to break it up and then vacuum it out just like raw Perlite/Vermiculite.

It's hard work moving the stuff around. I tried all sorts of tricks. Best thing for me was a plastic recycling bin with some tape over the bottom holes. YOu can mix and pour right from there, and the size is about right for the weight I'd want to be carrying around a roof.
Lots on the net...
Mix your own is cheaper...
Portland keeps it more solid...
Like making footpaths with a tiller and portland cement mixed in...


 
Hoytman
Member
Posts: 5994
Joined: Wed. Jan. 18, 2017 11:30 pm
Location: swOH near a little town where the homes are mobile and the cars aren’t
Hand Fed Coal Stove: Hitzer 354
Coal Size/Type: nut coal
Other Heating: electric, wood, oil

Post by Hoytman » Sun. Sep. 13, 2020 5:23 pm

deleted by Hoytman

Post Reply

Return to “Coal Bins, Chimneys, CO Detectors & Thermostats”