Am I cutting/installing this duct wrap correctly?

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Old 08-02-20, 04:04 PM
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Am I cutting/installing this duct wrap correctly?

The instructions say to measure P+13 inches, where P is the circumference of the pipe, and cut a 2" tape flap on the side and end.




6" circumference is 18.8 inches + 13 = 31.8 inches. I rounded down to 31 inches here:



It's really loose, but if I am reading this correctly, it's how they are saying to install it. There's like a 2 inch gap in some spots... I exaggerated the looseness here by pulling up in the first pic, but if I center the pipe it's not as bad.



I know there is supposed to be some air gap, but I'm I doing this correctly? I'm assuming I am, but wanted to check to make sure, or see if there were better methods.

Here's a pic of it installed on the duct in the crawl space:





Also are there any quick formulas or methods for cutting 6" elbows?
 

Last edited by tiresharkdbb; 08-02-20 at 05:40 PM.

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08-03-20, 12:45 AM
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Id adjust some to remove the gap, you dont want to compress insulation but the gap isnt doing anything!
 
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Old 08-03-20, 12:45 AM
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Id adjust some to remove the gap, you dont want to compress insulation but the gap isnt doing anything!
 
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Old 08-03-20, 02:46 PM
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Thanks Marq1... yeah I contacted the manufacturer, and they said it should be snug but not tight... so I will cut it smaller and remove the air gaps.


Not sure why they instruct it to be cut so loose, though...
 
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Old 08-04-20, 12:43 AM
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I always say "A good job looks bad" with respect to duct wrap workmanship. And don't forget the required staples and UL181 tape (bearing UL181... marking).
 
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