Eternabond prep when overlaying old eternabond

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February 05, 2019, 04:26:29 pm

It is time to redo the roof. Big difference from last year.

It already has eternabond - 4” - on it. I don’t know how long ago or even of it was truly eternabind though it usb some thin tape that looks like eternabond.

A picture is shown where a screw head is showing through (or nail head - can’t tell and the inside ceiling is nailed not screwed).

Joan - you talked about resetting the screw thatvpopped up. Did you scrape eternabind off enough to get a goodnight grip into it with the screwdriver bit, correct? Or was he eternabind thin enough to just press over it and get the screw down?

Ours has a small mostly flat bump/ridge under the eternabind so I am guessing the old stuff was scrapped off (or mostly) before the eternabind was put on.

Do I put the Dixie over the screwheas before (as part of the prep) before putting the eternabind in? It seems that would leave a smoother surface for the eternabind to cover and prevent that cracking around then screwhead. Burn would make it harder to put that screw back onnif it pops out again.

Thanks for sharing your experience.
Jane

Re: Eternabond prep when overlaying old eternabond

Reply #1 – February 05, 2019, 04:57:28 pm

Take and post a picture that covers a larger section of roof. From this picture, this does not look like Eternabond to me, possibly not even any tape...

Steve

Re: Eternabond prep when overlaying old eternabond

Reply #2 – February 05, 2019, 05:30:50 pm

Steve, I will see if I can grab another pic - way busy these days a and I am juggling major tasks along with the smaller ones.

But definately tape - looks just like new eternabind tape pics but dirty

. Thin and exactly 4” across.

Re: Eternabond prep when overlaying old eternabond

Reply #3 – February 05, 2019, 05:34:22 pm

You are seeing a roof seam screw, popping thoughts Eternabond tape. Older LDs roof seams were sealed with a polyurethane sealant that shrunk as it aged. The screw is where it should be, the Factory sealant has evaporated around it and the soft Eternabond adhesive as conformed to the surface under it, exposing the screw heads.

The cause of the screw head popping though the tape is the result of not prepping the original roof seam correctly.
In my many postings, I suggest cleaning the Factory seams and then overcoating any screw head with a blob of polyurethane, to seal it and to kept from ever coming through the Eternabond tape. Doesn't hurt to run a small bead of sealant down the entire roof seam and then pressing it flat with a gloved, wet finger, before applying the tape.
I have never re-coated a roof seam with a second layer of Eternabond, normally it's never be needed. I have had overlapped tape, in the front corners of the roof, lift in a few spots, so I can't guarantee a second coat would stick.
Forget about removing the existing Eternabond, it is near impossible.
I see two solutions .
First, seal the the protruding screw heads with polyurethane and call it good, periodically checking for new pops. The tape itself is still in good shape and will continue to seal the seam.
The other fix is to overcoat all the existing tape with 6" wide Eternabond tape. After cleaning and before applying the tape, spray the old Eternbond tape with Eternabond primer, to increase the chances of the new tape permanently sticking.
EternaPrime Spray
The primer is good use where ever a questionable surface is to be covered with Eternabond.

I suggest the first fix to start and see if that is a good enough fix. While the old tape can be covered with 6" tape, the wider tape is a handful for an experience installer, a nightmare for the uninitiated. The wider the tape, the more likely it is to roll over on itself, while installing. Once the adhesive touches any other section of tape, it is permanently is stuck together, trying to pull it apart will only stretch it, making it unusable.

Larry

Re: Eternabond prep when overlaying old eternabond

Reply #4 – February 06, 2019, 04:15:20 am

Larry, from what you have said here and other places, I think you are correct and we are seeing problems caused by the prep job before the Eternabond missing some steps.

I say this because not only do we have some screws (or nails, whatever they are) popping thru the Eternabond material like in the pic, but we also have some cracking down the center of the tape in some spots – the other place you say to prep.

Originally, I thought there was a nice mound of old sealant under the tape, but upon closer inspection on the day I took the picture there was only about 1/16th of an inch. I have no idea when the Eternabond was put in (or if the tape was actually Eternabond).

You said “seal the protruding screw heads with polyurethane”. Do you prefer the 3M 5200FC for this rather than Dicor? Or do both do an equally good job?

Do you find the metal roller that Eternabond sells is important to use or can a laminate roller do the same job (just being sure to press down very firmly). One of the Eternabond videos shows just pressing down firmly with fingers, but I would rather also do a roller.

My inclination, because there is more than a handful of spots, would be to clean well, use the polyurethane/dicor to fill over screws and in any cracks to make a nice smooth surface. Then prime and then put on 6” Eternabond to make it last forever. I would feel comfortable doing the 6” Eternbond.

Jane

Re: Eternabond prep when overlaying old eternabond

Reply #5 – February 06, 2019, 09:10:29 am

Thorough surface cleaning and prep is critical to a successful E-bond job; do-overs are very difficult! I suggest using the roller (I got the one sold from Best Materials where I bought the E-bond) to get a complete 'stickdown'; I found that the 4" tape was very manageable and covered the seams with plenty to spare on both sides. I would not have wanted to work with the 6" tape because of what I saw as the increased chance of it wrinkling and buckling (and possible subsequent stretching when one tried - unsuccessfully - to pull out the wrinkles!) as it was being laid down.

After cleaning and prepping the surfaces, I made a 4" template out of cardboard and 'lined' the 4" over-seam areas with a straight edge. I also rounded the corners of the ends of the E-bond strips (with scissors before removing the tape backing!) to avoid having sharp corners on the tape that might be more prone to lifting.

A few of the screws had popped through the original seam sealant; before I laid the E-bond, I re-seated those and topped each with a little E-bond band-aid before laying the E-bond strip; I didn't have any 5200 at that time I did the E-bond job.

Many of us have done this job; if the surface prep is done meticulously and tape laid without stretching and stuck down completely, the job will last. If prep steps are skipped or done poorly, it's a waste of time, energy, and materials. Have a great time!

Re: Eternabond prep when overlaying old eternabond

Reply #6 – February 06, 2019, 05:51:39 pm

Thanks for the tips Joan, drawing lines sounds like a good idea.

I found an old post that said that eternabond could be laid over eternabond - pull up the white (colored) part and it leaves behind a sticky grey mass that the new eternabond seals with well. I am going to call eternabond tomorrow to pick their brains (manufacturers often have great info).

I found Best Materials on the Eternabond seller web page (many on that page didn't sell eternbond so I had to go down the list). I am getting some primer there as it takes forever to get from Amazon and their prices are decent.

Best Marines in town has the 5200 as Lowes only had small tubes (for close to the full price cost).

Joan - my middle name is meticulous - it does serve me well in many tasks though I admit it causes overkill in some simple tasks.

Re: Eternabond prep when overlaying old eternabond

Reply #7 – February 06, 2019, 05:57:44 pm

my middle name is meticulous - it does serve me well in many tasks though I admit it causes overkill in some simple tasks.
---
I understand completely.

Re: Eternabond prep when overlaying old eternabond

Reply #8 – February 07, 2019, 10:10:10 pm

I talk to the eternabond tech-support this morning. They said the eternabond is really m sticky stuff - micro something they called it - with the white on the top being a UV protection. They believe in our case the white UV protection layer failed but the underneath held true.
He said even with the cracks we saw at the seam in the middle the tape and the cracks around the screws the sticky stuff should've held and he says the screw head can't just pop through that.

Because we're not 100% sure that's eternabond, their first choice is for us to take it all off down to the metal. And I said yeah but if it is eternabond that's a horrible job to try to do and he agreed.

His second choice was to take off the white top layer of the eternabond and lay down 6" eternabond (prepping the area to be covered that didn't have eternabond already there.

I asked about using primer and he said that is for if the temperature is lower than 40 degrees - not a problem for us right now.

I am going to try and poke at it tomorrow or Sat to confirm just the top layer is cracked and the bottom is the forever sticky eternabond bottom layer.

Jane

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February 05, 2019, 04:26:29 pm

Reply #1 – February 05, 2019, 04:57:28 pm

Reply #2 – February 05, 2019, 05:30:50 pm

Reply #3 – February 05, 2019, 05:34:22 pm

Reply #4 – February 06, 2019, 04:15:20 am

Reply #5 – February 06, 2019, 09:10:29 am

Reply #6 – February 06, 2019, 05:51:39 pm

Reply #7 – February 06, 2019, 05:57:44 pm

Reply #8 – February 07, 2019, 10:10:10 pm

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