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Old 04-21-2020, 04:36 PM   #1
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Square Piping Length For Roof Raise

Messed my order my 1.25 square piping length

Im raising my roof 1 and I ordered 16 square piping.

Will this be long enough for a 12 raise? Im just concerned there wont be enough overlap. I meant to order 20 - maybe that overkill I dont know.
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Old 04-21-2020, 05:30 PM   #2
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should be ok.

What kind of bus?

Does square tubing fit like a glove?
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Old 04-21-2020, 08:07 PM   #3
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2001 international

Im cutting under the windows so not exactly sure how it'll fit but from what i've seen 1.25" works for most.
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Old 04-21-2020, 08:42 PM   #4
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I think if your welding is good, a 2" overlap on each end would be enough.
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Old 04-21-2020, 11:56 PM   #5
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Quote:
Originally Posted by jones.unknowns View Post
2001 international

Im cutting under the windows so not exactly sure how it'll fit but from what i've seen 1.25" works for most.
Sure didn't fit my international. Had some custom braked at the local fab shop.
Have you done any test fitting or measuring?
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Old 04-22-2020, 01:56 AM   #6
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Since you will have 2" of overlap on each end, you will want to make sure every edge is welded. You welds will be a more secure than butt-end welding the tubes to the hat channel. The further out you can put the welds (i.e. the longer they are) the less severe the loads are on the welds.


To help you decide what to do, I prepared a little thought experiment.


For a visual, I took a piece of hat channel (steel black) and put in a piece of square tubing (blue). Well, actually it is angle iron that looks like square tubing. I placed a tape measure on the blue metal, so it is a bit difficult to see. However, I think you get the idea.


Here is what a 2" overlap looks like:
20200422_011510 2 inch overlap.jpg


Here is what a 4" overlap looks like:
20200422_011429 4 inch overlap.jpg


Of course, you will be putting an outer skin on and attaching it to the hat channel, same for some sort of inner wall. All of this adds strength to the overall structure. Bear in mind that since you plan on raising under the windows, there will more weight and thus more stress on the structure you are building to hold up the roof and windows.
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Old 04-22-2020, 11:15 AM   #7
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I am not an engineer.

I raised my roof 10" using 30" channel allowing 10" of overlap on each end. I feel quite comfortable with that.

If I found myself in your shoes, I would probably order new metal and try to retask the short metal.

Just my $0.02
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Old 04-22-2020, 12:13 PM   #8
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Thanks guys, I think because it’s under the windows and I don’t want to rely on my welding, I’m just going to repurpose the metal for a roof rack and get something longer.

I appreciate the input everyone!
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