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Sprinter RV's & Conversions Talk Common features found in Sprinter RV's and Conversions.


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Old 02-08-2014, 05:08 PM   #1
Graphite Dave
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Default Heat Reflective Roof Paint

Painting a van roof with a heat reflective paint would reduce interior temperatures. Did a short search on the subject and found:
Hy-Tech Bus Kote # 2150. White, acrylic elastomeric, insulating ceramic, waterproof coating designed specifically for buses and recreational vehicles. Originally designed as an insulating, reflective coating for school districts to use on the roofs of school buses to lower interior temperatures.
Does anyone have any knowledge about this product or any similar products?
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Old 02-09-2014, 01:10 AM   #2
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Default Re: Heat Reflective Roof Paint

No knowledge, but I have noticed school busses painted like this in Florida before.
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Old 02-09-2014, 05:26 AM   #3
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Default Re: Heat Reflective Roof Paint

They even paint them like that in MN now. You can get white elastomeric roof paint that would do a good job reflecting the heat. It is about $16 a gallon here.

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Old 02-10-2014, 08:25 PM   #4
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Default Re: Heat Reflective Roof Paint

http://www.greenbuildingadvisor.com/...is-own-product

This was for a Supertherm paint with ceramic balls, etc.

Also, a blurb at monolithic domes which compared regular white paint to ceramic ball paint, and found no difference in effect.

There are obviously different purposes to insulation (conduction, convection, radiation), and white paint or color would seem to be effective.

Interestingly, there was a study published years ago comparing different methods of windshield interior covers. The most effective was white on the side facing windshield and aluminum on the side facing interior (aluminum withlow emittance). t
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Old 02-10-2014, 09:41 PM   #5
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Default Re: Heat Reflective Roof Paint

http://www.greenbuildingadvisor.com/...ble-homeowners

Postings back and forth between advocates and original poster are interesting reads. Bottom line: not much evidence supporting these ceramic paints for any type of insulation, other than maybe solar reflectivity if white paint.

Remember years ago the comparison of these ceramic beads with NASA ceramic tiles. NASA had lots of interesting types of insulation for the space shuttle from the ceramic heat shield tiles to the multi-layered interior insulation of aluminum/air gaps.
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Old 02-10-2014, 10:39 PM   #6
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Default Re: Heat Reflective Roof Paint

Quote:
Originally Posted by OldWest View Post
http://www.greenbuildingadvisor.com/...ble-homeowners

Postings back and forth between advocates and original poster are interesting reads. Bottom line: not much evidence supporting these ceramic paints for any type of insulation, other than maybe solar reflectivity if white paint.

Remember years ago the comparison of these ceramic beads with NASA ceramic tiles. NASA had lots of interesting types of insulation for the space shuttle from the ceramic heat shield tiles to the multi-layered interior insulation of aluminum/air gaps.
Seems strange that some one has not produced a paint product that could be used on roofs to reduce the heat gain. Thought I would ask to see if anyone knew of such a product. The small hollow ceramic balls could be of value.
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Old 02-10-2014, 11:17 PM   #7
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Default Re: Heat Reflective Roof Paint

Here are 2 links

One is a company from my home state of FL

http://hytechsales.com/

They even have a bus roof product.

The other is a LONG 22 page thread but I got what I considered some valuable information from it.

http://www.hotrodders.com/forum/alte...in-103610.html

I am getting ready now to mix some oil based metal primer with about 1/4-1/2 micro balloons to undercoat my interior prior to insulation install, and then mix up a thicker layer using -3/4 and exterior latex for a final sealing.

Sounds interesting

Also I read somewhere I believe in the custom car site that there is a home roofing elastromeric paint with the micro ballons already added to it, don't remember the product name though.

Here is another link that lists several different products

http://www.crankshaftcoalition.com/w...mic_insulation

I'm sold and feel its worth a try, ordered 5# of micro balloons

I'll let you know how it goes

wade


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Old 02-10-2014, 11:40 PM   #8
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Default Re: Heat Reflective Roof Paint

Soo tired of ordering microballoons!

Im on my 6th 30lb box at about $500 a box, after shipping. :(

After all my experience blowing money on microballoons, i can safely say the best prices are at fiberglasssupply.com
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Old 02-11-2014, 12:26 AM   #9
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Default Re: Heat Reflective Roof Paint

FWIW, I considered painting Mariah's, the classy black B RV, top heat resistant/reflective white. With all,the wart, bumps, antennas,A/C, reinforcing ribs it was going to be far too expensive and far too much work with dubious payback in thermal resistance. There would not enough white surface area to make a difference on a Sprinter van.

The best pay off is to use a heat resistant film on all the windows and a bigger a/C. And interior insulation on a work van.
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Old 02-11-2014, 01:05 AM   #10
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Default Re: Heat Reflective Roof Paint

The heat resistant paint is commonplace in the tropics on iron roofs particularly.

Years ago I painted my previous motorhome (a 37 foot MB 303 coach conversion) and it worked a treat, definitely reduced the heat gain and being a thick flexible membrane cured the water leak problems I was having.

Solar panels provide a shade to the roof with the air gap below reducing the heat gain, then there is not much exposed roof left.

I am inclined to think that the smaller roof of a sprinter would be considerably less gain and I think the great expanse of glass would be a better place to address the effort.

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