Rutland Furnace Cement to seal storm collar?

[Stax]

We installed the liner last night. I think I made a mistake and used Rutland furnace cement to seal between liner and top plate as well as storm collar. It rained a couple hours after we did the install. Went up on the roof this morning and the cement is wet and will easily come off. Should I take off and seal with silicone or will furnace cement do the job?

 

[ScotO]

I don't think the Rutland furnace cement is the right stuff for the job......what you need is high temp silicone or firestop silicone......I believe Rutland makes a type of this too....the stuff I used is a pink/red color and is good to very high temps.....hope this helps a bit

 

[oldspark]

+ 1 on the high temp silicone

 

[jeff_t]

Use a hi-temp RTV silicone from your local auto parts store.

 

[RandyG]

I did the same thing, a couple of rain storms and it was all gone and I had a nice leak. I used silicone 2 which is rated to 400 degrees, shouldn't be getting near that hot above the roofline with class A chimney pipe and no more problems, got it at walmart.

 

[WES999]

When I installed my stove I used this.
(broken link removed to http://www.rutland.com/productinfo/500-f-rtv-high-heat-silicone-sealant---black.html)
No leaks.

 

[Stax]

Well, removed all the furnace cement and sealed with GE Silicone II. Should be good to go.

 

[Backwoods Savage]

You'll be glad you fixed it. The furnace cement is good stuff but just wrong for this particular application.

 

[Woody Stover]

used Rutland furnace cement to seal between liner and top plate as well as storm collar.

I don't think there is supposed to be anything between the liner and top plate because the liner will elongate when it heats up, and would break any sealant that's applied there. The storm collar is supposed to keep water out of that joint. My top plate has a raised area around the center hole so that water on the top plate can't run into the gap...

 

[Stax]

Woody, I siliconed between the liner and top plate because the top plate diameter was larger than my flue extender. This is because the magnaflex insulflex is preinsulated with another external liner.