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topic 18535

Roof heat reflective paints


2002

Can anyone tell me if white paint on roofs works just as well at reflecting heat as the expensive ceramic heat-reflective paint?

Thanks muchly, Jessica Walden (HOT South Australia)

Jessica Walden
- Adelaide, SA, Australia


Reflective Roof Coating




Insulating Paint

2003

Hi Jessica,

According to the results of the experiment conducted at the University of Nevada, Mechanical Engineering Department, there is a significant increase in energy usage (50%>) when regular outdoor paint is used, compared to ceramic paint.

MONTH       PAINT         Ceramic       % DIFF 
JUNE        167.99        117.21        43.32 
JULY        101.81         69.68        46.11 
AUGUST      175.72        109.72        60.15 
SEPTEMBER    63.16         39.55        59.69 
TOTALS      508.68 Watts  336.16 Watts  51.32%
 

To cut costs try a heat reflecting ceramic powder that can be added to any paint making that paint an insulating coating for your roof. I hope this is of some help,

Regards,

Dr Con Lozanovski
- Melbourne, Victoria, Australia


2005

There is a Technology that can provide a negative heat load to the roof of a building, it is known as a "Selective Surface", it is not an insulator like the ceramic coating people claim.
This technology is more so used in commercial buildings where there is a heavy A/C load, and in projects done with a major retailer a 50% drop in power consumption was found on the A/C plant, not bad considering the A/C cools the interior as well as incoming air, on this project the main a/c use was for cooling the hot summer air in the exchange. On a house environment it will keep the internal maximum temperature 4 to 5 degs below external shade ambient. This is only achieved through air conditioning in a normal environment.
Regards

Ted Lehmann
- Sydney, NSW

----
Ed. note: Ted, do you also have a university study we can extract here, showing those negative watts/square foot ratings?


2005

I am also looking for a heat selective roofing paint. I have found what seems to be a relevant product, but this is in Australia, so I would like a source in Thailand as the coverage is listed at 2-2.5 m2/litre. - a large volume to send from Australia to rural Thailand to paint a roof.
All ideas welcome!

Hugh Milner
water resource engineer - Buri Ram, Thailand


2006

Dear Mr. Milner,
We recommend you to use ceramic paints for roof-top coating. On metal roof, the temperature difference of coated and uncoated surface can be greater than 10 degrees C. during summer months.

Chalermchai Su-uthai
- Bangkok, Thailand


Attic "Heat Barrier" Paint

2006

Are there effective Heat reflective paint products that can be applied inside the attic of home with a traditional asphalt shingle roof?

Are there any effective Heat reflective paint products that can be applied to the outside ( on the shingles)?

Mark Ahlert
- Houston, Texas


 

Hi, Mark. There are paints that can be applied inside the attic that claim to reduce energy costs. I'm not personally disposed to believe it, but I don't have any experience with it to back up my intuition.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


September 4, 2009

Hi

I am an expat and I live in the tropics in the far east about 150 miles from the equator.I was hoping someone might know if I can paint exterior walls with a known and dependable heat resistant paint product.It gets extremely hot and humid here! Thanks.

Gearoid Campbell
property refurbisher - Kuala Lumpur,Selangor, Malaysia



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