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Old 07-26-2012, 11:07 AM   #21
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Re: Raising The Roof ~ Questions...

This is how I'm planning to execute my roof raise. The spacers are based on a suggestion in Ben Rosander's Select and Convert Your Bus on a Shoestring. He also recommends staggering these spacers vertically so they don't line up down the length of the bus (otherwise you're giving a place for the sidewall to "fold" in a rollover; a chain is as strong as its weakest link). The angle iron is my idea for bridging the spacer and reinforcing the post.



Welds would be along the length of the angle steel and at its ends (and of course at the junctures of the spacer and original bus frame rib). One caveat is if you use angle iron of about 1/8" thick, you lose 1/4" space between adjacent ribs/studs and I'm guessing the bus windows wouldn't fit anymore.

To paraphrase Rosander's warning at the beginning of his roof-raise chapter, if you aren't proficient at welding and precision work like this:
  • Learn how to do it from an expert.
    Find an expert to raise the roof for you.
    Don't raise the roof.
For me, that last one would mean either to become accustomed to stooping or find a high-roof bus. When I stand up straight while wearing shoes, the top of my head is about six inches higher than the middle of the ceiling of a standard school bus.
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Old 07-26-2012, 11:40 AM   #22
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Re: Raising The Roof ~ Questions...

i am not quite sure i follow your diagram. if i were raising the bus, i would use full length pieces of medium wall box tubing and frame it in. i wouldnt use angle iron. and i would extend it from at least the floor level to the roof level so that the box tubing was the full height of the side structure. and i would x brace between areas that did not contain a window. i also would use heavier material around the framework where a slide might go.
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Old 07-26-2012, 11:57 AM   #23
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Re: Raising The Roof ~ Questions...

Ditto what '49 said. Without getting into the science of it, box tubing provides a more rigid structure because its walls all work "against" each other when lateral loads are applied. Angle iron only provides rigidity in one plane and simply bends when forces are applied other than in that plane.
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Old 07-26-2012, 12:17 PM   #24
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Re: Raising The Roof ~ Questions...

Quote:
Originally Posted by chev49
i am not quite sure i follow your diagram. if i were raising the bus, i would use full length pieces of medium wall box tubing and frame it in. i wouldnt use angle iron. and i would extend it from at least the floor level to the roof level so that the box tubing was the full height of the side structure. and i would x brace between areas that did not contain a window. i also would use heavier material around the framework where a slide might go.
The piece labeled "spacer" is box tubing. It bridges the gap created after the ribs are cut and the roof raised. The book I cited uses that as the only added material. My angle iron would have welds along the entire length where it contacts the original rib. If I'm envisioning your idea correctly, your box tubing would fit inside the original rib (which in cross section looks like a top hat, at least in Superior Coach buses and probably most others). That does sound better, including the X bracing.

Edit: picture below added. Click to magnify.
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File Type: jpg roof_raise2.jpg (46.1 KB, 699 views)
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Old 07-26-2012, 12:19 PM   #25
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Re: Raising The Roof ~ Questions...

if you are doing it that way, then the box tubing would fit inside as you suggested. if you are just replacing the whole side structure, i would just use box tubing for everything...
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