I have a woodstove in my basement, and my chimney of course goes up through the attic. Since I burned 24 /7 The chimney gets warm and throws off heat in the attic, which then attributes to ice dams. What is the best way to insulate the chimney in the attic?
Insulating the chimney
- Thread starter gdr
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It is a brick masonry chimney with a tile, flu liner, with a stainless steel insert pipe. Does the rock wall completely insulate the chimney? Should I use airspace as well? How do I attach the rock wall?
Insulate the pipe if you have room. If not you could as a last resort pour vermiculite around your pipe.
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"Completely insulate" is not a thing. There is always heat loss. Insulation decreases that heat loss by increasing resistance to heat flow.
No need for air space. One needs 2" without combustibles around an inside masonry chimney if the liner is not insulated. Often this is not the case (joists, rafters, roof decking within the 2" space. So an insulated liner is generally necessary for safety (and code compliance).
(1" for outside chimneys).
Rockwool is not combustible.
I'd cut batts to the right size and use metal straps or even just metal wire to hold it in place.
OK, thank you, can I attach rockwool directly to the masonry chimney or should I try to go for a 2 inch airspace if possible?
As far as the batts go, should Iattach that directly to the chimney as well with no 2 inch airspace?
As far as the batts go, should Iattach that directly to the chimney as well with no 2 inch airspace?
It's fine to attach rockwool batts (or anything non-combustible) directly to the chimney.
Air gap would mean warmth will convect up between rockwool and masonry, leading to pooling at the roof top.
Air gap would mean warmth will convect up between rockwool and masonry, leading to pooling at the roof top.
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