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Old 06-26-2014, 12:03 PM   #1
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Duct decision


Current situation is old metal duct that needs cleaning inside (assumption), old insulation removed, sealed up and reinsulated.

3 rooms are supplied with what appears to be 7 inch metal duct, 1 is a 6 inch and 1 that is either a 9 or 10 inch that supplies 2 bedrooms.



So although a lot of work, having cleaned, old insulation removed, ducts sealed and insulation replaced is all doable.

Having said that, since these are for the most part short runs and straight, should I just go back with quality flex?

More questions I am sure!

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Old 06-27-2014, 05:44 AM   #2
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Duct decision


No harm in using flex. May have to go to the next size bigger flex to get the same amount of air flow.

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Old 07-14-2014, 09:07 PM   #3
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ok IF I have a roll of duct insulation and it is 48" wide x 25 feet long, do I cut the insulation in 4 foot width pieces by the diameter length or do I cut for the total length of the duct and then cut that piece for the diameter?

Dumb question I know

Also, should the new stuff be glued on??
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Old 07-14-2014, 10:26 PM   #4
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Duct decision


I would say depends on how straight the run is. If you have elbows to work around you definitely do not want 1 long piece. If you only have to go 10' all in one straight run then I would do it all at once, less joints is better for preventing air and thus condensation coming in contact with your old duct and new insulation. Just my opinion.
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Old 07-15-2014, 05:50 AM   #5
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Duct decision


Generally, you cut it by the roll width. So if doing a 7" pipe, you would cut a 24" length of the 4' roll.
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Old 07-15-2014, 06:46 AM   #6
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any glue used?
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Old 07-15-2014, 05:25 PM   #7
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You can spray glue if you want. But just stapling it is common, and then tape the joint.

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