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Inspecting HVAC Systems Topics include heating, venting, and air conditioning inspections.

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  #1  
Old 6/22/09, 2:27 PM
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mnahrgang mnahrgang is offline
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Default What is this red stuff?

I saw this red "caulk" on a furnace and water heater flue where they connect to the stack.

What is it? And is it okay for this use?
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red-stuff-dscn2656.jpg  



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Last edited by mnahrgang; 6/22/09 at 2:35 PM..
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  #2  
Old 6/22/09, 2:31 PM
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Default Re: What is this red stuff?

Looks like high temp sealant to me. I think the stuff is rated for over 500 F temps.



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  #3  
Old 6/22/09, 2:35 PM
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Default Re: What is this red stuff?

Quote:
Originally Posted by cevans View Post
Looks like high temp sealant to me. I think the stuff is rated for over 500 F temps.
So it's a non-issue? Correct?



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  #4  
Old 6/22/09, 2:37 PM
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Default Re: What is this red stuff?

I wouldn't make it an issue



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  #5  
Old 6/22/09, 2:39 PM
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Default Re: What is this red stuff?

Thanks Chuck!



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  #6  
Old 6/22/09, 2:43 PM
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Michael Larson Michael Larson is offline
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Default Re: What is this red stuff?

You mean besides ugly?

http://www.acehardwareoutlet.com/(ix...ge=4166724.JPG



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  #7  
Old 6/22/09, 2:58 PM
Jeffrey Moore Jeffrey Moore is offline
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Default Re: What is this red stuff?

Hope it is the high temp sealant and not RedGard waterproofing sealing material.
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  #8  
Old 6/22/09, 5:33 PM
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Default Re: What is this red stuff?

It is rated well over 500 degrees.

I would be concerned they need patching at all though.
The straight B vent appears to be just that, as in Horizontal.(maybe even angled down)
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  #9  
Old 6/22/09, 6:45 PM
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Wayne B. Wilson Wayne B. Wilson is offline
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Default Re: What is this red stuff?

Quote:
Originally Posted by relliott View Post
It is rated well over 500 degrees.

I would be concerned they need patching at all though.
The straight B vent appears to be just that, as in Horizontal.(maybe even angled down)
Just what i was thinking
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  #10  
Old 6/22/09, 6:50 PM
Larry D. Kage Larry D. Kage is offline
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Default Re: What is this red stuff?

They look like site made connections and when the caulk fails (and it will) leaks will start.



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  #11  
Old 6/22/09, 7:14 PM
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mnahrgang mnahrgang is offline
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Default Re: What is this red stuff?

Thanks guys.

Here's what I said in the report:

  • Observed the flue connection from the furnace and water heater, where they connect to the main stack, appear to be sealed with a red material similar to caulking. This appears to be what is known as a “high-tempertature-selant.” While this is likely not an issue, it is recommend to remove the material and replacement with proper flue sealant/tapes. Improvement.



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  #12  
Old 6/22/09, 7:22 PM
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Default Re: What is this red stuff?

Quote:
Originally Posted by mnahrgang View Post
Thanks guys.

Here's what I said in the report:

  • Observed the flue connection from the furnace and water heater, where they connect to the main stack, appear to be sealed with a red material similar to caulking. This appears to be what is known as a “high-tempertature-selant.” While this is likely not an issue, it is recommend to remove the material and replacement with proper flue sealant/tapes. Improvement.
Yep sir
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  #13  
Old 6/22/09, 7:49 PM
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Default Re: What is this red stuff?

Quote:
Originally Posted by mnahrgang View Post
Thanks guys.

Here's what I said in the report:

  • Observed the flue connection from the furnace and water heater, where they connect to the main stack, appear to be sealed with a red material similar to caulking. This appears to be what is known as a “high-tempertature-selant.” While this is likely not an issue, it is recommend to remove the material and replacement with proper flue sealant/tapes. Improvement.
Is there a tape rated for exhaust flue temps and intended for use on flues?

I usually write up tape on flue joints, I wouldn't have written anything for this.



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  #14  
Old 6/23/09, 1:05 AM
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Russel Ray Russel Ray is offline
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Default Re: What is this red stuff?

Quote:
Originally Posted by cevans View Post
Is there a tape rated for exhaust flue temps and intended for use on flues?
Yes.



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  #15  
Old 6/23/09, 7:33 AM
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Default Re: What is this red stuff?

Hey, at least they didn't utilize duct tape. I've seen many vents with dried-up duct tape falling off.
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