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07-17-2018, 03:36 AM
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#1
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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What kind of Roof....
I'm getting ready to add a second A/C unit to my Fuzion Impact 303 T.H. I will be removing the existing vent in the garage roof and once the sealant is up and the screws have been removed that hold the vent in place, I will need to seal those holes before installing the A/C unit there. So I have a couple of questions...
1. Is eternabond tape a good product to use to seal all the screw holes?
2. Should I remove the screws and tape over the holes....or.....should I put all the screws back in ( filling the holes so to speak), then tape over the screws?
3. Most likely, what type of Roof do I have on this trailer...TPO or the EDPM?
4. What type of cleaner do I need for the roof prior to putting the eternabond down for maximum adhesion.
I know, more than a "couple" questions but I want to do this right the first time and not have to deal with any water leaks. Thanks
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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07-17-2018, 03:47 AM
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#2
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,347
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The AC unit will have a foam gasket that will cover all the vent holes so you really don’t have to do anything. I like to remove as much lap sealant as I can to make a smoother surface. Makes it easier for the gasket to seal to the roof.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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07-17-2018, 04:19 AM
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#3
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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Thank you Chuckster....the A/C unit arrives today, so I haven't actually seen how big the metal pan/gasket area is. I just assumed that it wouldn't big enough to cover the existing screw hole area. Hope you are right. I may still fill the holes with some Dicor lap sealant since I already have some at the house......what do you think?
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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07-17-2018, 04:34 AM
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#4
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,347
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If you fill the holes, the AC gasket will adhere to it and make a bigger mess if you ever have to remove the unit.
The gasket is going to stick to whatever lap sealant is left so why make it more difficult. I use a plastic scraper and try to remove as much as I can, just be sure not to leave any “chunks” behind. The gasket for the AC is about 1 1/2” wide and the inside edge is just about flush with the edges of the vent. You’ll see it covers all the original vent screw holes.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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07-17-2018, 04:43 AM
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#5
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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Awesome....thanks again for your advice/help.
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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07-17-2018, 09:08 AM
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#6
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Vern, my roof is EPDM. I would assume (BE CAREFUL with that!) Yours is also.
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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07-17-2018, 09:33 AM
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#7
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Senior Member
Join Date: Feb 2014
Location: radium hot springs bc
Posts: 2,007
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Quote:
Originally Posted by ctbruce
Vern, my roof is EPDM. I would assume (BE CAREFUL with that!) Yours is also.
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Yes Chip. I've been caught on that word too often. I started using PRESUME.
A smart person said it means about the same.
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2018 Ram 3500 6.4 Harvest Edition
2018 Cougar 27RESWE
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07-17-2018, 09:38 AM
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#8
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Senior Member
Join Date: Nov 2016
Location: Austin
Posts: 363
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TPO roof
I checked the Trekwood website and they say your roof is TPO...see screen shot below.
Trekwood is probably the best place to find Keystone replacement parts or info about any particular part on your RV.
__________________
'19 Chevy 3500 High Country DRW
'18 Montana 3921FB Aggie ‘77
('17 Laredo 330RL previous RV)
In the sticks near Austin TX
Aussie Gus+Texas Heeler Jimmy
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07-17-2018, 10:10 AM
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#9
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Senior Member
Join Date: Nov 2016
Location: Austin
Posts: 363
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cleaning TPO roof
I found these items concerning cleaning TPO...one from the Eternabond website and one from the National Roofing Contractors Association. The Eternabond site has other bulletins about TPO roofs, and it seems that as TPO ages the surface degrades, so the Eternabond statement is saying you need to scratch/remove the weathered top surface to get to a clean surface for the micro sealant to stick to...sort of like prepping a surface for paint. The weathered surface is a bit porous for a good seal. Seems like if you remove the weathered surface you have accomplished most of the cleaning that is required once you wipe up the dust...might not need acetone!
__________________
'19 Chevy 3500 High Country DRW
'18 Montana 3921FB Aggie ‘77
('17 Laredo 330RL previous RV)
In the sticks near Austin TX
Aussie Gus+Texas Heeler Jimmy
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07-17-2018, 11:12 AM
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#10
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Quote:
Originally Posted by Mikendebbie
I checked the Trekwood website and they say your roof is TPO...see screen shot below.
Trekwood is probably the best place to find Keystone replacement parts or info about any particular part on your RV.
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Well it's one or the other. I assume/presume its EPDM as I have the same model trailer and looked at the roof on Saturday and it was.......drum roll.....EPDM.
__________________
Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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07-17-2018, 11:45 AM
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#11
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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So how do you determine which is which?
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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07-17-2018, 09:12 PM
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#12
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Quote:
Originally Posted by xrated
So how do you determine which is which?
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Glad you asked. Here is the easy way.
https://youtu.be/XGLSiG88S5c
Also, since you're taking your garage vent out, you'll have access to the membrane to check it.
__________________
Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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07-22-2018, 10:20 AM
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#13
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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Well I took the inside trim piece for the rear vent off today to get some more prep work done for the A/C install. My roof is the same color on both sides......TPO on the Impact 303 Chip. That's weird because your T.H. is just like mine except the garage on yours is 2' longer.
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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07-22-2018, 10:45 AM
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#14
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Quote:
Originally Posted by xrated
Well I took the inside trim piece for the rear vent off today to get some more prep work done for the A/C install. My roof is the same color on both sides......TPO on the Impact 303 Chip. That's weird because your T.H. is just like mine except the garage on yours is 2' longer.
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Yep weird. But it's an rv....
__________________
Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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07-22-2018, 11:28 AM
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#15
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Senior Member
Join Date: Oct 2016
Location: "Murvil, TN
Posts: 2,212
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The one other difference that I just saw, yours is a 2016 and mine is a 2017.....maybe a change in roof covering between model years?
__________________
2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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