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Old 07-27-2011, 07:59 PM   #1
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1980 20' Caravelle
Ogden , Utah
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Expansion anchors instead of elevator bolts for shell on floor replacement?

I searched this topic and didn't find it anywhere, but has anyone considered using some kind of expansion bolt instead of an elevator bolt to attach the floor and C channel in a shell on floor replacement? I understand why you would need to remove the banana wraps and belly pan to access for elevator bolts but it seems like a blind anchor would facilitate a floor replacement with only access from the top. I don't have space for a shell off and would prefer to do most of of the insulation installation and frame painting from above for obvious reasons. I know Molly bolts are not super strong but there are lots of other blind fasteners that might work. I found these insanely expensive (like $10-$20 each) ones called box bolts that are used to join heavy steel plate. I bet that these would work, but I can't afford them.

Hilti makes a variety of fasteners.

The aerospace industry has some larger rivet like items that might work.

These are made of aluminum and look very promising.

I'd love to hear the opinion of the community about this. Has anybody tried something like this? What are the potential pitfalls and problems?

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Old 07-27-2011, 08:55 PM   #2
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I just found this thread but Malonium didn't say if he actually tried this or if he just thought about it.


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Old 07-27-2011, 10:40 PM   #3
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what about these...

Trailer Floor Floorboard Deck Screws 1/4 x 2 1/2 100pc | eBay

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Old 12-12-2011, 01:57 PM   #4
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1964 19' Globetrotter
OH - Ohio , waynesville
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i don't suppose you ever figured out if this could be done. I'm open to anything that doesn't include removing the belly. there must be some kind of anchor that will work. If not, one of these genius airstreamers should invent one.....i'd buy it
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Old 12-12-2011, 05:43 PM   #5
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I'm in the middle of taking up the floor in my 74 Safari and I agree that it would be nice to get to them all from the top, but I was been told by many folks with more rivets then me that the belly would have to be dropped. The wraps were not that difficult to remove and I only really need to take off the very outside of the belly (in my safari). I could leave most of it on, but I have to say, after getting under there and seeing the aged rivets and the brittle aluminum I'm glad I took it all off. It has given me full access to the "bones" (trailer) of the trailer and I feel like I can access everything better with that open view and access. So basically I think the couple hours under the trailer (so far) have been worth it...just my 2 cents.
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