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Old 03-31-2011, 07:23 PM   #15
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The guy used two jacks and street side was first but only by a couple of minutes.
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Old 03-31-2011, 07:31 PM   #16
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Well then, the leak could be anywhere from the streetside corner around the rear and curbside corner, forward to the wheel well housing,if the water is running through the c-channel. If he had jacked up the curbside first, water would have flowed to streetside housing.

If you don't find a plumbing issue, I would check the rear pano. I believe in '06 the center rectangular window was not welded in the corners of the frame. Some other threads discuss the sealer in the corners giving way and allowing water inside the wall. There are other issues with the Panos. Do a search and read up. This has also caused rear floor rot on some units. Hopefully you're early in the issue and that hasn't happened.

Being an '06, it's time to take a look at all your sealer. It's time. Awning rail, door eyebrow, everything on the roof. Water can, and will, travel a long way....just to screw with you!
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Old 04-06-2011, 04:26 PM   #17
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Leak found and fixed

Went by Camper Clinic II in Buda, TX. on Sat. Explained the problem I had when I started this post to Les, a tech w 20 years AS experience, and he showed me an '08 w/the damage that resulted from not attending to the leak. Once I described the symptoms, he immediately suspected the cause. Told me to bring trailer in or fix it myself. Very helpful and I recommend them for their assistance.

On the trailer on their lot, water was coming in from the bottom of the rub rail where the rub rail fits against the utility box/bumper at rear of trailer. The '08 had fiberglass insulation under the rear pan, the water was absorbed and eventually rotted the flooring. Serious damage!!!

On my '06, the water was entering from the same location, as I soon discovered, but there is no fiberglass insulation under the pan. Instead, there is a corrugated tin foil type of vapor/dust barrier.

To confirm the source of the leak on my trailer I lowered the jack to its lowest position and used a hose to spray the rub rail at rear of trailer. Looking under the rear, water could be seen leaking from the pan.

Important note: When trailer was LEVEL and water was applied, no leaks appeared from the pan as the water was being trapped in the tin-foil material and was not migrating to the pan below.

To repair:

1. Drilled the rivets holding rear pan and dropped pan. Used a utility knife to make a long horizontal slit in both sections of the tin foil type material. Water poured out.

2. Left to dry out overnight. Floor was not wet and the pan itself contained no water, so just inspecting the pan a person would have concluded there was no leak.

3. Applied caulk (Dap Alex Ultra 230 black) at the BASE (not the top) of the rub rail where the rub rail joins the utility box. There was no caulk here applied by the factory!!

4. Remounted the pan with rivets.

5. Drilled ten 1/4 inch holes in the bottom of the pan so that if water should enter again from the same source, it can drain out and air can enter to dry.

6. Lowered the trailer front again and flooded the rub rail/utility box area to test for water leaking from pan and voila--no leaks.

I'm not aware how widespread this problem is, but were it not for the fact that I watched as the rear of my trailer was jacked up for the tire changing and observed the water dripping out, I would have never noticed the water build up until it rotted the floor.

One final note--I've had people come by and start to sit on the bumper/utility box and I've asked them in strong language not to. If someone had done this in the past, it seems possible, that action (depending on the person't weight) could have caused or at least exacerbated the damage.

As always, many thanks to all of you who responded to my post and convinced me that I had a serious problem that I needed to address.
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Old 04-06-2011, 05:21 PM   #18
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Glad you found it. I forgot about that one. There are several threads on that leak.
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Old 04-06-2011, 05:38 PM   #19
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Originally Posted by HCR View Post
Went by Camper Clinic II in Buda, TX. on Sat. Explained the problem I had when I started this post to Les, a tech w 20 years AS experience, and he showed me an '08 w/the damage that resulted from not attending to the leak. Once I described the symptoms, he immediately suspected the cause. Told me to bring trailer in or fix it myself. Very helpful and I recommend them for their assistance.

On the trailer on their lot, water was coming in from the bottom of the rub rail where the rub rail fits against the utility box/bumper at rear of trailer. The '08 had fiberglass insulation under the rear pan, the water was absorbed and eventually rotted the flooring. Serious damage!!!

On my '06, the water was entering from the same location, as I soon discovered, but there is no fiberglass insulation under the pan. Instead, there is a corrugated tin foil type of vapor/dust barrier.

To confirm the source of the leak on my trailer I lowered the jack to its lowest position and used a hose to spray the rub rail at rear of trailer. Looking under the rear, water could be seen leaking from the pan.

Important note: When trailer was LEVEL and water was applied, no leaks appeared from the pan as the water was being trapped in the tin-foil material and was not migrating to the pan below.


As always, many thanks to all of you who responded to my post and convinced me that I had a serious problem that I needed to address.
Ahh, the infamous rear bumper leak. Most Airstreams from 1969 forward are prone to suffer from this leak. You've got to keep that beltline sealed or you'll have major issues with that back floor area. A poor design. Yet another reason to love the older vintage Airstreams.
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Old 04-06-2011, 05:42 PM   #20
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If the older AS didn't have leak problems them where do all the rotten floors come from?
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Old 04-06-2011, 05:50 PM   #21
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If the older AS didn't have leak problems them where do all the rotten floors come from?
I didn't say the pre-69 Airstreams don't leak. I said that this particular bumper design and rear body shape combines to create a serious design flaw that requires attention.

The rear end of post-69 Airstreams slope inward and water runs down this slope and collects right where the rear bumper is located. BAD! I know, I've got one. Had to replace the rear floor in my '72.

Pre-69 Airstreams slope outward. Water doesn't collect anywhere. GOOD! My '58 is 14 years older and no rotten floor in the back.
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