Insulation added to outside of roof?

[DRBW]

came across this. A bit pricey but looks effective for an application on the top of the roof. http://www.kflexusa.com/HomePages/Pr...prod=25&line=2

[mrblah]

That's almost 2.3$ /sq foot. Not cheap indeed.

https://www.grainger.com/product/K-F...on-Sheet-3F414

[Tango]

There has been a lot of discussion here regarding thermal insulating paints and additives. And much of it somewhat contentious for whatever reason. My personal experience with Hy-tech has indicated a substantial reduction in transmitted radiant heat when the surface is properly treated. They make one product called BusKote which is a rubberized paint that contains ceramic microspheres and they also sell the microspheres separately for use with any type paint.

I have seen and felt it in action on 100+ Houston days and I am using it extensively on my shorty, including a coating on the roof.

Feel free to express whatever, but as noted, having seen what it can do in person, I am going to continue it's use.

My dos centavos.

[CaptSquid]

My late father got sucked into one of those "insulating paints" schemes. He laid out almost $5K for enough paint to cover the cathedral ceiling inside the house. They alleged a major savings in fuel costs.

Long story short: IT DIDN'T WORK! But, the ceiling sure looks nice.

[DRBW]

I am on my second conversion and used the NASA developed bus coat paint on the first bus. I spent a ton of money on it and it did not provide the insulation that I felt was needed. I am not considering it for this bus. I am in Florida and the heat transfer through the ribs is massive. Those roof coatings are touted on the internet but there are also several articles that have examined its effectiveness and do not support it. I have looked into the closed cell spray coatings and they are pricy as well (probably effective) but may lack cosmetic appeal with the final product. Has anyone attempted the spray foam? How effective has it been?

At this point I am looking at 1 1/2 inch glue and stick foam that I can either paint with elastomeric coating or fiberglass. I looked at possible roof rack designs but with already low mpg I am concerned that adding more wind drag would cost more over time.

[CaptSquid]

How about considering a second roof mounted on stand-offs, kinda like the ones on the Land Rovers you see in the movie Hatari!?

[DRBW]

I had given that some consideration but was concerned about drilling holes in the roof. I sent for same samples of the KFLEX today to test it out.

[Tango]

Me...I'm planing on a Hatari style roof deck (not to be confused with...Atari). The old Land Rover double roofs worked great at reducing radiated ceiling heat.