You guys have been great for learning the right way to do things, I am down to a few details
I am installing a Heat-Fab rigid liner into a 6.25-6.5 x 10.5” ID clay lined flue and will ovalize it in order to insulate it. I am trying to decide what insulation method to use. The chimney is only 15’ tall, with a 20” horizontal through the wall, so I really need to optimize the install.
The Heat Fab insulation that is part of their “system” is only ¼” thick, with a stiff aluminum outer shell. If I went this route it would require less ovalizing than using a ½” blanket and should fit without too much trouble, but 1/4" seems thin to me. Do you guys think it would be better to go with thicker ½” insulation, but requires more ovalization of the liner?
Heat-Fab’s installation booklet has a disclaimer to only use their ¼” shelled insulation, but I believe that is because that it the only configuration they tested it with. The rest of the industry seems to use ½” blankets with 304SS liners and it works fine, so I am not too concerned with violating their warning. Does anyone have an idea as to how much better the draft would be if a thicker blanket was used, or would the extra ovalization negate any benifit?
Thanks
Bill
I am installing a Heat-Fab rigid liner into a 6.25-6.5 x 10.5” ID clay lined flue and will ovalize it in order to insulate it. I am trying to decide what insulation method to use. The chimney is only 15’ tall, with a 20” horizontal through the wall, so I really need to optimize the install.
The Heat Fab insulation that is part of their “system” is only ¼” thick, with a stiff aluminum outer shell. If I went this route it would require less ovalizing than using a ½” blanket and should fit without too much trouble, but 1/4" seems thin to me. Do you guys think it would be better to go with thicker ½” insulation, but requires more ovalization of the liner?
Heat-Fab’s installation booklet has a disclaimer to only use their ¼” shelled insulation, but I believe that is because that it the only configuration they tested it with. The rest of the industry seems to use ½” blankets with 304SS liners and it works fine, so I am not too concerned with violating their warning. Does anyone have an idea as to how much better the draft would be if a thicker blanket was used, or would the extra ovalization negate any benifit?
Thanks
Bill