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Heating & Air Conditioning Home Repair DIY

Am I cutting/installing this ductwrap correctly?

6 years ago

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.

https://i.imgur.com/QBPO8gQ.png

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

https://i.imgur.com/nXa9MLV.jpg

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.

https://i.imgur.com/6XxDPdr.jpg

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.

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

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Comments (2)

party_music50
6 years ago
The "+13" is used if your insulation/wrap is 2 3/8" thick from the pkg. What you show in the photos doesn't look that thick, so check on that first.

I believe that when they say to wrap "loosely", they don't mean that there should be an air gap. They mean that you shouldn't wrap so tightly that you compress the insulation.
sktn77a
6 years ago
You don't want large air gaps. Just don't wrap it so tight that it compresses the insulation. P+13" seems too big.
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