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Old 02-09-2021, 09:26 AM   #1
Mini-Skoolie
 
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Join Date: Aug 2018
Location: Arkansas Ozark Foothills
Posts: 67
Year: 2002
Coachwork: BlueBird
Chassis: TC2000-8 Window
Engine: Cumm ISB/Allison 2000
What gauge roof metal/roof ribs?

My first choice to bolt a solar roof rack thru the outer metal skin into my roof ribs using rivnuts.

- How thick is the roof metal? I'm thinking that it is about 16 ga.

- How thick is the metal on my roof rib? Does 11 ga. sound about right?

From what I can see it will require 1/2" rivnuts due to the thickness that is there.

My second choice is to drill thru the skin and use a piece of angle iron on the inside to distribute the load across the thin metal skin. Probably easier, but going thru the ribs looks to be stronger. Also, the second choice may lead to distortion of the metal skin due to flexing.
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Old 02-09-2021, 10:06 AM   #2
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Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,031
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
20 ga. is what the roof and ceiling are made of. The ribs are 14ga.
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Old 02-10-2021, 11:00 AM   #3
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Join Date: Oct 2020
Location: Florida
Posts: 163
Coachwork: IC Corp
Chassis: RE-300, 42ft
Engine: 466ci
Rated Cap: 90


Maybe just the newer IC Corp buses use 16g outside? Do you think they mean only the floors? My interior ceiling is thin, like the interior walls. ECCB does know his steel.
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Old 02-10-2021, 12:01 PM   #4
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Location: Eustis FLORIDA
Posts: 23,031
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
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Maybe just the newer IC Corp buses use 16g outside? Do you think they mean only the floors? My interior ceiling is thin, like the interior walls. ECCB does know his steel.
later model ic buses are 16ga.
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Old 02-10-2021, 02:40 PM   #5
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Join Date: Jan 2019
Location: Philadelphia
Posts: 4,779
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
I was about to go measure my ribs but I realized they're completely buried now. I think ECCB is right about the ribs - on my bus the outer skin and ceiling are 20 ga and the floor is bent 16 ga. but I'm pretty sure the ribs are a thicker material than 1/16".
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Old 02-10-2021, 05:21 PM   #6
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Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,031
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Originally Posted by musigenesis View Post
I was about to go measure my ribs but I realized they're completely buried now. I think ECCB is right about the ribs - on my bus the outer skin and ceiling are 20 ga and the floor is bent 16 ga. but I'm pretty sure the ribs are a thicker material than 1/16".
the ribs on my old IC and my thomas are 14/15.
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