What sealant to use for blockoff plate?

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Gridlock

Gridlock

Member
Feb 13, 2010
223
New Paltz, NY
My stove sits on a hearth with the flue pipe through the chimney. I have a blockoff plate on the bottom of the chimney where the flue pipe goes through. What type of sealant should be used between the blockoff plate and the flue pipe? It has to be high temperature enough and allow for expansion of the flue. Could rock wool be stuffed around the pipe instead of using sealant?

Thanks in advance
 
Yes - That's what I did. I added a bit more after the first year as a little area had worked loose.
 
zzr7ky said:
Yes - That's what I did. I added a bit more after the first year as a little area had worked loose.
Click to expand...
Thanks for the info. The sweep decided to go this route, as he felt that furnace cement might crack due to expansion of the flue and blockoff plate.
 
Gridlock, just don't use the kind that catches on fire while you are in the shower.
 
shawneyboy said:
Gridlock, just don't use the kind that catches on fire while you are in the shower.
Click to expand...
Are you referring to cement or insulation? Supposedly the sweep used rock wool that's good to 3000 degrees, but I am having another shop look everything over.

Thanks.
 
I was thinking about using stove door gasket material. Have a ring that would bolt to the blockoff plate. When tightened it would squeeze the gasket into the chimney and make an air tight seal. Kinda like a bead lock wheel. Have nutzerts in the blockoff plate that the ring would bolt to.

Might be overkill but it would work.
 
I used a piece of leftover 1/2" wrap insulation from my flex liner install. I wrapped it around with a little overlap and used a worm-gear clamp to hold it up snug to the underside of the block off plate. Anyone seen the new quick adjust worm drive clamps? No more endless screwing to tighten it up, the screw part flips up and you push the flat band through til snug and just finish it with screw driver.
 
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