Type of Sealant Used on Vent Joints?

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Old 10-22-19, 09:56 PM
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Type of Sealant Used on Vent Joints?

I was in my attic yesterday and noticed that the bathroom exhaust fan vent (and all subsequent joints) had some type of tape(?) to seal the joints.


Havenít seen this before. Any idea what it is?


[img]blob:https://www.doityourself.com/3fcfc3ac-5244-406f-b85c-d5c3d59957ad[/img]
 
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Old 10-22-19, 09:58 PM
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Foil tape is commonly used on ductwork.
 
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Old 10-22-19, 11:38 PM
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Your pictures do not show up.

how-insert-pictures
 
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Old 10-23-19, 02:23 AM
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Foil tape yes, duck/duct tape no!
 
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Old 10-23-19, 12:57 PM
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Whoops, that's what I get for trying to post from the phone.

Pic is below. Best I can figure is that it is wrapped in fiberglass joint tape with mastic sealant applied on top of that.
 
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Old 10-23-19, 04:51 PM
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Yes, it looks like mastic.
 
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Old 10-24-19, 05:46 AM
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Yes, that's ductwork mastic, where I am grey is usually water based and if red would be solvent based.
it is a very durable material .
Can't tell if that is a crack or just a line in the material.
Even though it is strong and stays slightly flexible when dry you need to secure joints with screws before applying.
 
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Old 10-24-19, 06:02 AM
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Just an observation:

I dont see any insulation around the duct or on the ceiling, is that frost on the rafter?
 
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