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Old 03-03-2014, 04:24 PM   #1
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Insulation added to outside of roof?

So I have this hare-brained idea of adding insulation to the outside of the roof, in order to maximize both insulation efficiency and headroom without doing a roof raise. I thought the best way to go about it might be to laminate thin layers of a flexible insulation panel, such as 1/2" Styrofoam (several thinner layers would be more flexible than one thick layer), and then coat it all with fiberglass, then a top coat of Hytech Bus Kote. This should eliminate the problem of thermal transfer through the metal structure of the roof. I'm thinking four layers of 1/2" foam sheets would be enough. The down side as I see it would be the potential for delamination and the altered appearance of the bus.

Has anyone ever tried something like this? What were your results? Any advice?
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Old 03-03-2014, 07:40 PM   #2
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Re: Insulation added to outside of roof?

In some commercial and industrial applications, a 6 pound spray foam is applied directly to the outside of the steel roofing.

Spray foam is painted with a UV stable latex paint. Repaint every 5 to 10 years with a sprayer.

For reference the spray foam used in homes is 2 pound, and the great stuff cans are half pound density. They use 6 pound so they can walk on it, and to take hail.



Anything else would be a nightmare to secure well enough to drive down the road.

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Old 03-04-2014, 09:29 AM   #3
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Re: Insulation added to outside of roof?

Thanks Nat. That looks like the easiest way to do it, but how would it look on the bus? I was hoping to make it look nice and smooth and original looking. I think the spray foam would require a lot of sanding/shaving to make it look decent. I hadn't thought about the density. Good point.
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Old 03-04-2014, 10:19 AM   #4
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Re: Insulation added to outside of roof?

The initial install would need to be done carefully and neat as possible. I think as long as the edges were strait and defined, and thickness was consistent, it would look alright.

It would not take much. 1 inch would do wonders, and over 2 inches would be just wasting.

Nat
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Old 03-04-2014, 10:56 AM   #5
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Re: Insulation added to outside of roof?

How do you think it would hold up to the vibration and wind from driving? It is intriguing to me that they actually do this on buildings, but they don't have to deal with vibration and constant 60+mph winds.
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Old 03-04-2014, 11:05 AM   #6
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Re: Insulation added to outside of roof?

I really like this idea! It would be especially do-able if you will have a roof rack on top, so there is even less concern about appearance, or possible damage from the environment or walking on it.
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Old 03-04-2014, 11:06 AM   #7
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Re: Insulation added to outside of roof?

The adhesion is good enough, and the 6 pound density is quite strong.

I'm sure it won't, but If the surface started to get tattered, we could give it a thin coating of fiberglass.

I was going to use this process on my bus, but decided with my roof deck, roof raise, and 6 inches of attic insulation, it won't be needed.

I was going to share this Ida last fall when I first saw it on a job site, but got busy and forgot. I'm glad some one asked.

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Old 03-04-2014, 11:13 AM   #8
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Re: Insulation added to outside of roof?

Very interesting indeed. I can especially see where this would be a viable option with a roof deck. I'm having a hard timing getting the picture of a roof covered in great-stuff foam out of my head, but I realize that is NOT what it would look like
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Old 03-04-2014, 11:27 AM   #9
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Re: Insulation added to outside of roof?

Quote:
Originally Posted by JakeC
I'm having a hard timing getting the picture of a roof covered in great-stuff foam out of my head, but I realize that is NOT what it would look like
Lol, yup I can see that being a little traumatizing. It looks more like elephant skin.

Some pics from Google.





This one has 3 inches of foam over normal corrugated roofing tin.



Nat
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Old 03-04-2014, 12:44 PM   #10
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Re: Insulation added to outside of roof?

That is pretty dang cool. Definitely nicer than the picture in my head, lol!!
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