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 > Replacing the Corplast underbelly on travel trailer

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Posted: 09/07/17 07:44pm Link  |  Quote  |  Print  |  Notify Moderator

Hello. This is my first post! I am replacing the thermal underbelly material (corplast) on my TT. Has anyone replaced it on theirs?
The concern I have is that the old material sagged and we got “moused” badly. In addition, some of the heating ducts extend down a couple of inches, so I can’t just screw the new material back up.
I want to frame it out using lightweight 2”x3” aluminum downspout material and was wondering if anyone has experience using it. I plan on adding some spray foam inside it in various places for rigidity. I would then screw the new corplast to the aluminum using sheet metal screws. This would give me the additional space I need for the heating ducts.
Are there any concerns I need to be aware of?
Thank you!

ScottG

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Posted: 09/07/17 09:18pm Link  |  Quote  |  Print  |  Notify Moderator

Mine used fender washers to spread out the load. That seemed to work well.


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Posted: 09/08/17 06:29am Link  |  Quote  |  Print  |  Notify Moderator

I used 2 by fir ripped down to match the existing frame width. I insulated with Lowe's foam board and R-Max & cut to fit smaller pieces to wedge into the frame perimeter. It seems to maintain a 6 to 10°F differential most cold nights with no heat running.

Plumbing tape was used to spread the load by the manufacturer, I reused it.


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theoldwizard1

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Posted: 09/08/17 09:12am Link  |  Quote  |  Print  |  Notify Moderator

Aluminum downspouts are VERY thin !

Seeing as there is nothing structural, how about PVC/plastic square downspout material ? I would use stainless fender washer and long stainless screws to drill THROUGH and secure the corplast to the actual frame.

Sounds like a good material for the job !

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Posted: 09/09/17 07:44pm Link  |  Quote  |  Print  |  Notify Moderator

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TurnThePage

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Posted: 09/10/17 11:29am Link  |  Quote  |  Print  |  Notify Moderator

When I added it to my trailer which had none, I supported it with angle aluminum between the frame rails. It worked great.


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