Roof heat reflective paints
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
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
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.
- Sydney, NSW
Ed. note: Ted, do you also have a university study we can extract here, showing those negative watts/square foot ratings?
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!
water resource engineer - Buri Ram, Thailand
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.
- Bangkok, Thailand
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)?
- 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.
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"
September 4, 2009
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.
property refurbisher - Kuala Lumpur,Selangor, Malaysia
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