Storm Collar Question

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sixman

sixman

Feeling the Heat
Apr 12, 2010
257
Central Texas
The instructions with my roof boot said to seal the storm collar to the chimney with high heat silicone. I have looked all over town but have not been able to find any locally except that that is used in automotive applications and it is rate to 500 degrees intermittently. What type of sealer do I need to use and how hot will that class A double wall pipe get on the outside?
 
Even the Rutland stuff packed expressly for that purpose is rated similarly( ~500°F). Since it's all basically the same stuff, I wouldn't think there'd be a problem using high temp silicone from an auto parts store. Rick
 
I built a small test fire yesterday and it just about ran me out of the house since it was 85 outside. I should have gotten on the roof and hit that pipe with my temp gun to see how hot it gets but I didn't think about it. Does anyone know about how hot it will get?
 
I can tell you that when my shop stove is burning normally, a magnetic thermometer on the single-wall pipe just above the flue collar will show 450°F - 500°F, and another one about 6 feet up the pipe will be at least 150°F - 200°F lower. With double-wall pipe, of course, the exterior temps will be a good deal lower. Rick
 
I can put my hand on our class A briefly when the stove has been running a while. I would guess it gets to about 125-130°F. You can use a good quality regular silicone adhesive caulk like GE Silicone II. The pipe temp is well below the caulk's rated temp. I've peel off 10 year old silicone off of the storm collar on a pipe and it was still pliable. But if you want to be extra safe, automotive RTV silicone is ok too.
 
I wasn't sure if the automotive RTV would stand up to the UV rays. I found this stuff called Through the Roof. It pretty expensive but highly recommended by my guy at the lumber yard. Only thing is the max temp on the service range is 180.
 
Automotive RTV will be fine if you can't find "the real stuff". I've used it in the field when I'm out of the Rutland RTV. I would think any stove shop should carry it in stock. It is readily available on many websites on the interweb.
 
sixman said:
I wasn't sure if the automotive RTV would stand up to the UV rays. I found this stuff called Through the Roof. It pretty expensive but highly recommended by my guy at the lumber yard. Only thing is the max temp on the service range is 180.
Click to expand...

Use a pure silicone adhesive sealant. GE Silicone has a UV guarantee.
 
use regular old silicone, it'll be fine - DO NOT use latex caulking.
 
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