insulating and leaking

beermann

Burning Hunk
Jan 16, 2017
248
canada
Late last year I insulated around the flue of my chimney. I'll be putting a blocker plate on later this winter. My first question is should I climb on my roof and place some insulation at the top of the flue and may even cram whatever insulation I have left down there between the chimney and the flue.

Second question is this:
I have some liquid dried around the top of my fireplace. Should I be concerned and should I perhaps put some sealant were the flue meets the fireplace.

Pictures added
20190911_210721.jpg 20190911_210710.jpg 20190911_210603.jpg
 
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webby3650

Master of Fire
Sep 2, 2008
10,195
Indiana
That looks to be sealed up pretty well, not sure how much a block off plate will increase efficiency?
You most likely need some work done to the chimney crown. Sometimes it just needs sealed rather than replaced. Hopefully it’s repairable. Can you get a picture of the top of your chimney by chance?
 

beermann

Burning Hunk
Jan 16, 2017
248
canada
That looks to be sealed up pretty well, not sure how much a block off plate will increase efficiency?
You most likely need some work done to the chimney crown. Sometimes it just needs sealed rather than replaced. Hopefully it’s repairable. Can you get a picture of the top of your chimney by chance?

I can get a picture tomorrow.

I know that the plate on top of the chimney does not have sealant around it. Maby this is my issue.

It's still in great condition as it's only 2yrs old.
 

begreen

Mooderator
Staff member
Nov 18, 2005
78,132
South Puget Sound, WA
I can get a picture tomorrow.

I know that the plate on top of the chimney does not have sealant around it. Maby this is my issue.

It's still in great condition as it's only 2yrs old.
The top plate should have a generous bead of silicone underneath it. Is there a storm collar? Pics will help.
 

beermann

Burning Hunk
Jan 16, 2017
248
canada
The top plate should have a generous bead of silicone underneath it. Is there a storm collar? Pics will help.
Pictures to come tomorrow I'll snap a bunch while I clean the flue in the A.M.
 

beermann

Burning Hunk
Jan 16, 2017
248
canada
The top plate should have a generous bead of silicone underneath it. Is there a storm collar? Pics will help.
What about the extra insulation I have left over. Should I cram as much as i can along the side of the flue from up top as well?
 

begreen

Mooderator
Staff member
Nov 18, 2005
78,132
South Puget Sound, WA
It won't hurt. The upper 2-3 ft is often where most buildup occurs.
 

beermann

Burning Hunk
Jan 16, 2017
248
canada
I insulated a couple feet around the top of the flue and used high temp caulking as a sealant around the cap. I also saw some cracks in the clay and sealed it up with the caulking. A small repair job to replace that clay liner next summer I think. From what I could see the other clay liners were fine
 

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webby3650

Master of Fire
Sep 2, 2008
10,195
Indiana
I insulated a couple feet around the top of the flue and used high temp caulking as a sealant around the cap. I also saw some cracks in the clay and sealed it up with the caulking. A small repair job to replace that clay liner next summer I think. From what I could see the other clay liners were fine
There’s no reason to replace any clay liners if you’ve got an insulated stainless liner. You don’t need to use red high temp silicone either. Regular silicone is high temp enough.
 

beermann

Burning Hunk
Jan 16, 2017
248
canada
There’s no reason to replace any clay liners if you’ve got an insulated stainless liner. You don’t need to use red high temp silicone either. Regular silicone is high temp enough.

The liner is not fully insulated except for the 2 feet of insulation I put in at the top and the insulation around the damper above the stove.

If you reckon that's enough I'll stop there and work on insulating around my insert and getting some flashing to cover things up around the insulation.

And yeah I thought the red silicon I got might be overkill but I wasn't sure. Thanks for letting me know.
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
18,408
central pa
You need a new crown on that chimney.
 

webby3650

Master of Fire
Sep 2, 2008
10,195
Indiana
The liner is not fully insulated except for the 2 feet of insulation I put in at the top and the insulation around the damper above the stove.

If you reckon that's enough I'll stop there and work on insulating around my insert and getting some flashing to cover things up around the insulation.

And yeah I thought the red silicon I got might be overkill but I wasn't sure. Thanks for letting me know.
Insulated liners always perform better, and it’s a must if you’ve got cracked clay liners.
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
18,408
central pa
Insulated liners always perform better, and it’s a must if you’ve got cracked clay liners.
What does cracked clay have to do with insulation on a liner???? I agree the liner should be insulated for sure. But not because of cracked tiles
 
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beermann

Burning Hunk
Jan 16, 2017
248
canada
In short I cant fit an insulated liner down the chimney. But I can squeeze a bunch of insulation around it from the top and bottom.

I was happy with its performance prior to insulting and sealing the top. I'm looking forward to seeing how it performs with insulation around the insert as well.

Thanks everyone