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Old 12-24-2011, 09:18 PM   #1
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Duct mastic to seal roof seams?

Can the mastic used to seal HVAC duct seams in a stick house be used to seal RV roof seams? I know it is air tight and flexible but do not know about being outside. I would of course cover the mastic with something like Kool Seal or such? Any ideas, anyone try this rube idea?

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Old 12-24-2011, 09:49 PM   #2
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The only things to seal roof seams are Dicor or Eternabond tape. I would not try to use A/C duct mastic.

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Old 12-24-2011, 10:08 PM   #3
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The only things to seal roof seams are Dicor or Eternabond tape. I would not try to use A/C duct mastic.

Ken
+1

I doubt that mastic designed for indoor use has anti-UV stabilizers.
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Old 12-25-2011, 12:01 AM   #4
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dont try to reinvent the wheel. too expensive if you mess up.
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Old 12-25-2011, 12:06 AM   #5
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Can the mastic used to seal HVAC duct seams in a stick house be used to seal RV roof seams? I know it is air tight and flexible but do not know about being outside. I would of course cover the mastic with something like Kool Seal or such? Any ideas, anyone try this rube idea?

ronspradley
I have seen videos of Duct tape being used for RV window replacement and I know they use it for the roof vents. So I would think so. Here is a video of a window reseal which they recomend the same product that is used in HVAC ductworl.
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Old 12-25-2011, 06:55 AM   #6
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Nice video on the window fix. But that is not duct tape. Do a search on this site and on youtube for eternabond. Many many recommendations for permanent roof repair using eternabond.
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Old 12-25-2011, 07:22 AM   #7
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+1 Eternabond and Dicor. Anything else is penny-wise and pound-foolish.
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Old 12-25-2011, 10:21 AM   #8
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Appreciate all the responses. Like not trying to re-invent the wheel. Using products for something they are not designed for. Like say using a floor polish on the outside of fiberglass RV's. I mean, what are the chances of that working, right? Thanks again.

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Old 12-25-2011, 07:25 PM   #9
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I have seen videos of Duct tape being used for RV window replacement and I know they use it for the roof vents. So I would think so. Here is a video of a window reseal which they recomend the same product that is used in HVAC ductworl.
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Old 12-25-2011, 07:30 PM   #10
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Originally Posted by ronspradley View Post
Can the mastic used to seal HVAC duct seams in a stick house be used to seal RV roof seams? I know it is air tight and flexible but do not know about being outside. I would of course cover the mastic with something like Kool Seal or such? Any ideas, anyone try this rube idea?

ronspradley
As someone familiar with duct mastic... NO. You want your roof to be clean and nice looking. YOu will never get that look with mastic. Besides eternabond tape is uv and waterproof. Do it once for less than $200 in materials and tools.
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Old 12-26-2011, 08:11 AM   #11
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I think the question was concerning replacing the weatherstripping around a window that leaked not roof repair. Eternabond for roof repair yes, But you would use exactly what they are using to fix a window leak. The putty strip. Dont think eternabond would work to fix a leaky window. It might but it would surely look like hell..
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Old 12-26-2011, 08:14 AM   #12
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I think the question was concerning replacing the weatherstripping around a window that leaked not roof repair. Eternabond for roof repair yes, But you would use exactly what they are using to fix a window leak. The putty strip. Dont think eternabond would work to fix a leaky window. It might but it would surely look like hell..
Oops I guess the original question was about roof leaks. Sorry my bad.
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Old 12-26-2011, 04:11 PM   #13
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Appreciate all the responses. Like not trying to re-invent the wheel. Using products for something they are not designed for. Like say using a floor polish on the outside of fiberglass RV's. I mean, what are the chances of that working, right? Thanks again.

ronspradley
Exactly! btw, this is what i will be using on the rv next year:



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Old 02-05-2012, 10:05 AM   #14
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Originally Posted by ronspradley View Post
Can the mastic used to seal HVAC duct seams in a stick house be used to seal RV roof seams? I know it is air tight and flexible but do not know about being outside. I would of course cover the mastic with something like Kool Seal or such? Any ideas, anyone try this rube idea?

ronspradley
Well I work in the hvac field and used mastic and has worked for 4 years now with NO leak. Here is what I used
Rolled Mastic Duct Sealants

Application: Indoor/Outdoor; Carton Qty.: 16; Description: Silver Foil Grip Printed; Mfg. #: AFG-1402-3; Size: 3" x 100';
And
Mastic Duct Sealants

Application: Indoor/Outdoor Water Based Duct Sealant; Approval/Listed: UL181A/B; Description: White; Lot Qty.: 4; Mfg. #: CCW-181-4; Size: One Gallon;. Both made by hardcast
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