How to Use Lap Seal

[RedHorse1]

A side note on Eternabond... I think it's now called "Sticknbond".

[TCNashville]

I have a roll of Eternabond and the cleaner but I've been putting off installation because I'm unsure of how to apply over existing caulk. From what I've been reading, there are no do-overs with this stuff in case I screw it up. The Dicor on the roof is uneven especially where the roof membrane meets the caulk, probably a 1/4" higher. I'm afraid of air pockets and not getting a good seal. I guess I should start at the top of the caulk and gently apply to the bottom with a roller? And doing the front cap, is it easy to apply an 8' section or do you put it on in sections then use caulk?

[clarche]

The key to using Eternabond is making sure you have a good outer edge seal of your tape. You wanna make sure that water cannot penetrate and seep under it. You will have some bubbles especially over the old dicor sealants. This is why it is very important to buy tape wide enough to cover. Rule of thumb...1 inch of tape on each side of seam that will seat flat without bubbles on the roof. Usually 4 inch wide tape is sufficient to cover most seams nothing under 4 inch is advisable


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[FeatherFam]

Very helpful! Has anyone used the Eternabond all the way down the length of your trailer just for good measure as a preventative? Is this worth the expense? It seems like those long seams would have a lot of failure and leak potential into the walls.

[troutslayer]

Originally Posted by FeatherFam

Very helpful! Has anyone used the Eternabond all the way down the length of your trailer just for good measure as a preventative? Is this worth the expense? It seems like those long seams would have a lot of failure and leak potential into the walls.

There is a youtube video on this from loveyourrv.com (I believe). I was going to do this, and bought the material, but am unsure as to where to end the overlay onto the gutter. If it's done wrong it could trap water behind the gutter screw cover. At least that's how it is on mine so I probably won't do it.

[Hoppy220]

What size eternabond do most of you use, I see they have 2, 4, and 6 inch, and typically (without me getting my lazy ass on the roof and figuring it out) how many feet would it take? The second is kinda a general question, I know it varies depending on size of unit and roof cuts

[TCNashville]

Originally Posted by Hoppy220

What size eternabond do most of you use, I see they have 2, 4, and 6 inch, and typically (without me getting my lazy ass on the roof and figuring it out) how many feet would it take? The second is kinda a general question, I know it varies depending on size of unit and roof cuts

I think most use the 4". I have a 25' roll and by my calculations that will do my 3 roof vents and my front cap with a foot left over. That is if I don't screw anything up. I should've bought a 50' roll because I want to do around the fridge vent etc., so I'll just buy another 25' and use the rest for emergencies.

[troutslayer]

Originally Posted by Hoppy220

What size eternabond do most of you use, I see they have 2, 4, and 6 inch, and typically (without me getting my lazy ass on the roof and figuring it out) how many feet would it take? The second is kinda a general question, I know it varies depending on size of unit and roof cuts

I use the 4" around all the roof cuts but used 6" where the roof meets the front fiberglas cap. I suppose you could also buy the 6" and cut it into 3" strips.