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 > Eternabonding the windows.....

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Bert the Welder

Van. Island

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Posted: 10/08/20 09:14am Link  |  Quote  |  Print  |  Notify Moderator

LarryJM wrote:

gbopp wrote:

Would the (minimal) thickness of the Eternabond interfere with the window seating properly on the butyl tape?
I'm thinking it could leave a small gap between the window and the side of the RV.
Maybe it would be better to just use the tape they use on houses?


Instead of Eternabond if I was redoing a window I would wrap the opening like the OP suggested with 2"/3" wide aluminum tape. It's extremely thin and would make the opening basically waterproof. You would just have to be careful installing the window to avoid tearing the tape.

Larry


That's why I wouldn't use Alum. tape. Way to fragile. Plus, when a screw goes into it, it doesn't have that "self healing" property that EB has. And Shoving a window into a frame, you are guarantied to tear it. PLUS the Alum. tape won't handle expansion/contraction well.


"> 1998 GMC 2500, 10.5 Okanagan, My better/smarter half, George and Finnegan(APBT), all I need.


Bert the Welder

Van. Island

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Posted: 10/08/20 09:34am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Bert the Welder wrote:

Was in the shop today and the rubber/synthetic sticky tape they put around house windows these days got me thinking. Why not do that on RV's?
Wrap the window cutout with Eternabond tape, maybe the 2" stuff, inside the cutout frame and out over the outside. Just enough that it doesn't peek out from beneath the window frame. Then butyl on top to bed the window.

Why bother with the first step. Just butyl tape.

I do NOT believe that ANY caulk/sealant lasts "forever". When you place it between two dissimilar materials and expose it to a "non-sheltered" environment you have two powerful forces acting against it.

All materials heat and shrink with ambient temperature changes. The bigger the change in temperature the more expansion/contraction. This is a very powerful force working AGAINST your caulk/sealant !

Sunlight, especially the Ultraviolet portion of the spectrum, causes material to "breakdown" over time.

IMHO, design seals to accept butyl tape and be easily replaced.


EB isn't a caulk.
It won't be exposed to sun. It's under the frame/trim.
EB is designs to stick to a dissimilar material by design
EB is designed to flex with temp changes and movement
The EB is design for UV exposure, but refer to line #2
Butyl is still being used for it's original purpose of bedding the window and sealing around the screw holding said window in place. It's just bedding on the EB surface or at least the narrow strip that is wrapping around to the campers exterior surface.
Also, the butyl is still going to be a maintenance item. The EB isn't there to replace it, nor effect it's performance as a material. It's there to do what it's designed to do. A durable, tough, long lasting membrane to provide a primary seal to prevent water soaking/wicking into the exposed edge of the camper exterior shell and internal frame/insulation materials. The butyl still performs it's job of bedding the window into a water proof material, preventing water from getting into the camper, as long as it is still within it's functional life span.

Bert the Welder

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Posted: 10/08/20 09:38am Link  |  Quote  |  Print  |  Notify Moderator

Well, at least one guy read what I said and got it......LOL!
Perhaps it was my use of the house window construction that folks aren't familiar with?
Trying to think of a better way without a drawing to make it clearer, but I don't think I can.....

K_and_I

North Central Ohio

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Posted: 10/09/20 07:26am Link  |  Quote  |  Print  |  Notify Moderator

From JLConline dot com

[image]


K_and_I
2011 Rockwood 2604
Nights Camped in 2019: 85
Do we have time for shortcuts?

Bert the Welder

Van. Island

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Posted: 10/09/20 10:46am Link  |  Quote  |  Print  |  Notify Moderator

K_and_I wrote:

From JLConline dot com

[image]


Thanks for that. That is what I'm talking about. It's an extra layer of protection against water intrusion.
Another level of protection for wood frames is to paint them. Painting the camper wood frames would be a good way to improve or at least delay the effects of water intrusion.
I've noticed on some new home construction that they've gone one step further and are applying this EB type stuff to the whole house once the sheathing has gone on. Comes in rolls like building paper. So it weather proofs the house, not the siding. Vary smart. That Tyvek stuff is garbage and NEVER applied correctly.

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