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12-24-2011, 08:18 PM
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#1
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Senior Member
Gulf Streamers Club
Join Date: Mar 2011
Location: Central Texas
Posts: 3,796
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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?
ronspradley
__________________
'95 Monaco Windsor DP 32' Cummins 5.9
Toads '96 Tracker 4x4, '06 Honda CRV AWD
Life's too short to drink diet soda. 
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12-24-2011, 08:49 PM
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#2
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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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
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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12-24-2011, 09:08 PM
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#3
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Quote:
Originally Posted by TXiceman
The only things to seal roof seams are Dicor or Eternabond tape. I would not try to use A/C duct mastic.
Ken
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+1
I doubt that mastic designed for indoor use has anti-UV stabilizers.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
 Yellowstone Lake 6-1-2012
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12-24-2011, 11:01 PM
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#4
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Nov 2010
Location: Williamsburg, VA
Posts: 650
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dont try to reinvent the wheel. too expensive if you mess up.
__________________
1999 Winnebago Minnie 29', Ford V10, Close to stock.
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12-24-2011, 11:06 PM
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#5
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Senior Member
Join Date: Mar 2011
Posts: 125
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Quote:
Originally Posted by ronspradley
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
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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.
__________________
Tony G.
98 Monaco Dynasty
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12-25-2011, 05:55 AM
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#6
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Aug 2010
Location: Portland, Oregon
Posts: 872
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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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12-25-2011, 06:22 AM
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#7
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Senior Member
National RV Owners Club Workhorse Chassis Owner Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 2,266
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+1 Eternabond and Dicor. Anything else is penny-wise and pound-foolish.
__________________
2002 National Dolphin LX 6356
Workhorse W-22 chassis
Don't believe everything you think.
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12-25-2011, 09:21 AM
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#8
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Senior Member
Gulf Streamers Club
Join Date: Mar 2011
Location: Central Texas
Posts: 3,796
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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
__________________
'95 Monaco Windsor DP 32' Cummins 5.9
Toads '96 Tracker 4x4, '06 Honda CRV AWD
Life's too short to drink diet soda.
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12-25-2011, 06:25 PM
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#9
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Senior Member
Gulf Streamers Club
Join Date: Mar 2011
Location: Central Texas
Posts: 3,796
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Quote:
Originally Posted by gonzo136
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. |
Thanks for this link. Good information on replacing seal on windows. And there are also links to other repairs that will be helpful. I have resealed windows with the putty tape shown here successfully. But what I am trying to do is to seal roof seams.
ronspradley
__________________
'95 Monaco Windsor DP 32' Cummins 5.9
Toads '96 Tracker 4x4, '06 Honda CRV AWD
Life's too short to drink diet soda.
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12-25-2011, 06:30 PM
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#10
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Nov 2009
Posts: 1,363
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Quote:
Originally Posted by ronspradley
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
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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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12-26-2011, 07:11 AM
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#11
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Senior Member
Join Date: Feb 2011
Posts: 514
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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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Don and Maxine McQueen
1996 Damon Intruder
F53 Chassis 33 ft
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12-26-2011, 07:14 AM
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#12
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Senior Member
Join Date: Feb 2011
Posts: 514
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Quote:
Originally Posted by donandmax
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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Oops I guess the original question was about roof leaks. Sorry my bad. 
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Don and Maxine McQueen
1996 Damon Intruder
F53 Chassis 33 ft
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12-26-2011, 03:11 PM
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#13
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Nov 2010
Location: Williamsburg, VA
Posts: 650
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Quote:
Originally Posted by ronspradley
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
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Exactly! btw, this is what i will be using on the rv next year:
__________________
1999 Winnebago Minnie 29', Ford V10, Close to stock.
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02-05-2012, 09:05 AM
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#14
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Junior Member
Join Date: Jan 2012
Posts: 10
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Quote:
Originally Posted by ronspradley
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
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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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