Will a perlite/cement mix flow down this small gap?

[sleewok]

Hey all,

My liner was an extremely tight fit. I have about 1.5" at the corners that I would like to insulate. I know it won't make a huge difference, but I am set on doing it.

Will a cement mix ( 6:1 perlite / cement mix) flow down these cavities? I've never made this mix before so I am not sure how well it flows. I have a 25ft drop that I need to get down. If it won't work then I'll just settle for loose filling and top it off in a year after it settles.

I appreciate any insight or help!

 

[bholler]

Hey all,

My liner was an extremely tight fit. I have about 1.5" at the corners that I would like to insulate. I know it won't make a huge difference, but I am set on doing it.

Will a cement mix ( 6:1 perlite / cement mix) flow down these cavities? I've never made this mix before so I am not sure how well it flows. I have a 25ft drop that I need to get down. If it won't work then I'll just settle for loose filling and top it off in a year after it settles.

I appreciate any insight or help!

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You aren't going to get enough insulation in there for code compliance, safety, or performance. The clay really should have been removed

 

[sleewok]

You aren't going to get enough insulation in there for code compliance, safety, or performance. The clay really should have been removed

Yeah, I agree. It definitely should have been removed. I'll eventually replace the chimney (10 year), but the performance has been great and there was very little creosote after burning last season (mostly dry, some green).

 

[sleewok]

You aren't going to get enough insulation in there for code compliance, safety, or performance. The clay really should have been removed

Follow-up question: Is it true that if your clay liner is intact and good condition then insulation is not necessary (or something along those lines)? If that is the case, then wouldn't lining with cement mix ensure the integrity and fill any potential voids?

 

[bholler]

Follow-up question: Is it true that if your clay liner is intact and good condition then insulation is not necessary (or something along those lines)? If that is the case, then wouldn't lining with cement mix ensure the integrity and fill any potential voids?

That is not true at all. What matters is clearance to combustibles from the outside of the masonry chimney structure. You need 1" for an external chimney and 2" for internal. But if you don't have that clearance you will never meet code with that liner in those clay liners