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Old 12-01-2016, 09:21 AM   #1
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1960 24' Tradewind
Kingsville , Ontario
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Help with...The plan

Hey all, I am about to put the new bellyskin on, and am thinking about using self tapping screws instead of rivets.... any thoughts???? Also, I will be putting a sheet of reflectix insulation between the bellyskin and frame...for added insulation.
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Old 12-01-2016, 09:38 AM   #2
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1955 22' Safari
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Only with loctite

I tried that and found that they tended to back out. Went back to rivets.
I think self tappers would work if you use some form of threadlock.
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Old 12-08-2016, 06:47 PM   #3
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Pretty sure they'll cause corrosion?
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Old 12-08-2016, 07:10 PM   #4
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RE: Corrosion - The frame is steel, the screws are steel, only Al is the belly skin. The reflectix will isolate the skin from the frame. Put a plastic washer under the screw head and use some thread-lock.

That said, I have no experience with thread-lock on coarse thread screws like sheet metal screws, but there are lots of self drilling sheet metal screws under my trailer holding on cables, propane lines and such. To my knowledge none have backed out. Thread-lock would be good insurance.

Al
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Old 12-08-2016, 11:24 PM   #5
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Reflectix calls for an air gap fwiw you won't get the R value posted on the box with this setup. Save your money.
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Old 12-09-2016, 11:17 AM   #6
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Quote:
Originally Posted by millertimeUS View Post
Reflectix calls for an air gap fwiw you won't get the R value posted on the box with this setup. Save your money.

True...but I want to share this Empirical Data: I sit on cold aluminum bleachers in the winter and I bring a small reflectix pad for my butt. My butt isn't quite calibrated to determine exact R values, but I can tell you for certain that even without airspace there are some pretty clear insulating properties!
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Old 12-09-2016, 12:14 PM   #7
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Kansas City , Kansas
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Rivets will be cheaper and lighter. But if you don't want to use rivets then I recommend these "thread forming" Fastite 2000 screws for joining aluminum sheets. If you want to join a sheet to a thick steel frame member then use taptite screws instead. We use them a lot at work and they are superior to typical thread cutting self-tapping screws in many ways. The head profile has a self-locking feature and they drive in nice and straight rather than crooked. A pleasure to work with. See this data sheet for more info...

http://www.taptite.com/pdfs/document...NTI-reminc.pdf

You can get them from McMaster Carr

https://www.mcmaster.com/#fastite-screws/=15ea8yl
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