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Open Roads Forum  >  General RVing Issues

 > Dicor lap sealant or Eternabond tape for new roof vent

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rlw999

Washington State

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Posted: 03/02/21 11:28pm Link  |  Quote  |  Print  |  Notify Moderator

I'm replacing a roof vent with one with a fan. I have both Dicor self leveling lap sealant and some 4" Eternabond tape. The roof is TPO.

The current vent is sealed with lap sealant, but I'm not sure which to use for the replacement.

The way I see it, Eternabond (assuming the surface is clean and prepped) gives a better seal and will last for a decade. But with the drawback that it's very hard to remove if I need to replace the vent again down the road (though cutting it and just leaving it there is an option).

So what do you think, which would you use?

kwplot34

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Posted: 03/02/21 11:59pm Link  |  Quote  |  Print  |  Notify Moderator

Pro's and con's to everything, Dicor is easy to replace, but you have to keep an eye on it and do maintenance. Tape will last a long time, but is extremely hard to remove without hurting the roof liner. I use the dicor and do the maintenance, but carry the tape incase of an emergency.

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whittier

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Posted: 03/03/21 12:26am Link  |  Quote  |  Print  |  Notify Moderator

I have a fiberglass roof membrane and I have used 4" Eternabond tape with excellent results. I am a Eternabond believer.Once you touch the tape to the roof surface it better be in the correct location, because it is somewhat un-forgiving
Applied 12 years ago to my roof vents and never a leak.

Guy Roan

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Posted: 03/03/21 04:09am Link  |  Quote  |  Print  |  Notify Moderator

If it was mine and the flange went down nice and smooth, I would use self leveling Dicor

Guy

pasusan

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Posted: 03/03/21 04:10am Link  |  Quote  |  Print  |  Notify Moderator

I would use Eternabond if it is possible. I've got Eternabond around everything on my trailer roof - but when I replaced the Fantastic Fan with a Maxxair Fan in my class B - couldn't use it. I don't remember for sure, but it had something to do with the mounting bolt heads - I think they were too big and high - so the Eternabond just wasn't working. Dicor worked great in that instance.


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Super_Dave

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Posted: 03/03/21 07:03am Link  |  Quote  |  Print  |  Notify Moderator

Both, belt and suspenders, no worries.


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opnspaces

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Posted: 03/03/21 08:36am Link  |  Quote  |  Print  |  Notify Moderator

I would put Dicor under the vent and then Eternabond it. Then just don't drive under any low branches.


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Lwiddis

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Posted: 03/03/21 08:49am Link  |  Quote  |  Print  |  Notify Moderator

2x on opnspaces opinion.


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JIMNLIN

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Posted: 03/03/21 08:55am Link  |  Quote  |  Print  |  Notify Moderator

My 24 years old 32' 5er has had nothing but Dicor added when the OEM sealant needed help or replacing. The trailer was 4 year old when a crack formed in the skylite over the bed. I replaced it with a vent. I used the grey butyl tape like OEM first. Removed the squeeze out butyl then added Dicor over the scr heads and joint. Haven't touched it since.

I helped a neighbor replace Eternabond on his roof (around two skylites) that some newb had poorly applied. I would never add Eternabond over screw heads. Its a bitzh to remove even when poorly applied.

Having worked on RV and mobilehome mostly roof mfg/repair previously I would never add Eternabond over screw heads. Great stuff for hole repair or repairing long tears in roofing material.


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Posted: 03/03/21 11:47am Link  |  Quote  |  Print  |  Notify Moderator

Super_Dave wrote:

Both, belt and suspenders, no worries.


YES!!!


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