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Sealing top rails [message #259906]

Sun, 24 August 2014 11:06

GeorgeRud

Messages: 1380
Registered: February 2007
Location: Chicago, IL

Karma: 0

Senior Member

After all the heavy rains we had yesterday, I discovered I had leakage from the roof that needs revealing. I think a significant amount is coming from the upper side rails as the previous owner had tried using a fair amount of silicone applied to the outside of the rail/roof rail. Though I know it's a major job to remove the rails, I think it's the appropriate way to solve these leaks.

Any suggestions as to what the best sealant would be? I'm tempted to use the black butyl ribbon type of sealant that is used to mount windows, but any previous experiences are appreciated.

George Rudawsky
Chicago, IL
75 Palm Beach

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Re: [GMCnet] Sealing top rails [message #259910 is a reply to message #259906]

Sun, 24 August 2014 11:21

Sammy Williams

Messages: 522
Registered: August 2010

Karma: -2

Senior Member

after you remove the rails, why not use gasket type material and make
gaskets, use sealer too and reinstall

S. Williams

On Sun, Aug 24, 2014 at 11:08 AM, George Rudawsky
wrote:

> After all the heavy rains we had yesterday, I discovered I had leakage
> from the roof that needs revealing. I think a significant amount is coming
> from the upper side rails as the previous owner had tried using a fair
> amount of silicone applied to the outside of the rail/roof rail. Though I
> know
> it's a major job to remove the rails, I think it's the appropriate way to
> solve these leaks.
>
> Any suggestions as to what the best sealant would be? I'm tempted to use
> the black butyl ribbon type of sealant that is used to mount windows, but
> any previous experiences are appreciated.
> --
> George Rudawsky
> Chicago, IL
> 75 Palm Beach
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> GMCnet mailing list
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>
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Re: Sealing top rails [message #259911 is a reply to message #259906]

Sun, 24 August 2014 11:40

armandminnie

Messages: 864
Registered: May 2009
Location: Marana, AZ

Karma: 2

Senior Member

I got some sealer from Jim Bounds that he uses and recommends. It goes above the seam and in the groove where the screw holes are and some at each end. It takes two tubes to do the job.

Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org

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Re: [GMCnet] Sealing top rails [message #259916 is a reply to message #259906]

Sun, 24 August 2014 12:16

kelvin

Messages: 608
Registered: February 2004
Location: Eugene, OR

Karma: 0

Senior Member

On 8/24/2014 9:08 AM, George Rudawsky wrote:
> After all the heavy rains we had yesterday, I discovered I had leakage from the roof that needs revealing. I think a significant amount is coming
> from the upper side rails as the previous owner had tried using a fair amount of silicone applied to the outside of the rail/roof rail. Though I know
> it's a major job to remove the rails, I think it's the appropriate way to solve these leaks.
>
> Any suggestions as to what the best sealant would be? I'm tempted to use the black butyl ribbon type of sealant that is used to mount windows, but
> any previous experiences are appreciated.

I pulled mine off years ago and cleaned stuff up.

http://www.gmcmhphotos.com/photos/g3702-roof-sidepanel-trim-stip-r-amp-r.html

After scraping the PO's silcone mess AND whatever GMC put in there I
used polyurethane sealant to fill the visible seams and rivet heads. I
had water getting onto that extrusion who-knows-where and running either
fore or aft, depending on how the coach was sitting. It's been leak
free since then.

Kelvin
'73 23' in Eugene, OR
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Re: [GMCnet] Sealing top rails [message #259920 is a reply to message #259910]

Sun, 24 August 2014 13:10

Jim at the Co-op

Messages: 291
Registered: May 2014
Location: Orlando Florida

Karma: 2

Senior Member

There is a "locking" slot the 2 extrusions slip into, there is not enough tolerance for the mating to take place. This is an expasionmoving joint. You must have a flexible adhesive sealant to not release in the normal movement of the joint. The body of our coach is not rigid, the engineers made the flexability of the body part of the vibration damping as well as being an active part of the suspension. Not only because of its super low center of gravity the are other go cart theories at play.

The rail is not the seal, its protection of the moving joint. The sealing is done under the rail

Jim Bounds

Sent from my T-Mobile 4G LTE Device

-------- Original message --------
From: Armand Minnie
Date: 08/24/2014 12:40 PM (GMT-05:00)
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Sealing top rails

I got some sealer from Jim Bounds that he uses and recommends. It goes above the seam and in the groove where the screw holes are and some at each
end. It takes two tubes to do the job.

--
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
http://www.minniebiz.com
http://www.gmcws.org

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Re: [GMCnet] Sealing top rails [message #259947 is a reply to message #259906]

Sun, 24 August 2014 17:44

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

George,

This might be of help:

http://gmcws.org/blog/?p=1827

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of George Rudawsky
Sent: Sunday, August 24, 2014 11:09 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Sealing top rails

After all the heavy rains we had yesterday, I discovered I had leakage from the roof that needs revealing. I think a significant
amount is coming
from the upper side rails as the previous owner had tried using a fair amount of silicone applied to the outside of the rail/roof
rail. Though I know
it's a major job to remove the rails, I think it's the appropriate way to solve these leaks.

Any suggestions as to what the best sealant would be? I'm tempted to use the black butyl ribbon type of sealant that is used to
mount windows, but
any previous experiences are appreciated.
--
George Rudawsky
Chicago, IL
75 Palm Beach
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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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