Questions on replacing 20yr old flex duct

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I need to replace the flex duct in my crawl space and looking for any helpful info I can get. What R value? The more the better? When to use foil tape vs mastic? Should I replace the insulation wrapped around the plenum? Thanks for your feedback!
 
Hard pipe would be better for airflow, typically 6" round is used wether flex or pipe , you would need to confirm the size. If hard pipe is used they sell insulation that slips over it.

Insulation to cover plenuim

Insulation tape , I couldn't find a link with the tape with fibers. Here we used a foil tape that has fibers , you need siccors.

6 " duct flex .
 
We use what I call panduit straps , real big zip ties , for attaching flex. There is a tool that tightens and cuts them .

As far as sealer , we don't seal flex , you reply on the panduit strap to seal. Google ductwork sealant if you need to connect hard pipe.
 
all boils down to your choice.

flex duct or hard duct.

after you make up your mindl i can help with how to install'

i am not going to type out how for both,

flex is cheap...as you can see,you will repalce latter down the rd

hard duct cost more, but is their for a longer time
 
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