The Incredible Effect of Coating Our Roof w/ Acrylic White Paint!

Just what I needed. Thank you so much for the detailed breakdown. You completely covered all topics down to the price & conversion. Much appreciated. Subscribed and sharing with others as this is very useful. God bless.

I totally enjoyed your very detailed report about white colored roof paint. There's actually a Boysen paint called Cool Roof that have reflective particles in the paint itself. I wonder if that product will result in a lower temp readings compared to your unofficial experiment? I'm also surprised that no one in the Philippines have thought about venting the roof ridge itself. Also, are pipe boot flashing available in the Philippines? Boots in conjunction with proper sealants are better protection against water intrusion. I also think that cool roof paints in conjunction with proper attic venting and proper insulation will result in even more comfortable temps inside the house.

White does work. I live in the south end of the San Joaquin Valley in California and the temperature is 10 degrees cooler in the house after installing a white metal roof over my composition roof.

This is just my own opinion. I used to think that the color of the roof would significantly reduce the heat inside of house but a lot of roofer told me that 10 degrees difference on the surface of the roof wouldn't be much different in temperature for the space between the roof and the ceiling. As long as you installed heat insulation correctly (I just used the cheap aluminium insulation sheet), the temperature underneath the roof would significantly be lower than without the insulation. So if you already installed the insulation, the temperature difference due to the color of the is negligible which for me is true. We used to turn on AC almost everyday but after installing the insulation, we only turn it on a few days a month which save a lot on electricity bill.

Given your findings on the cooler zinc coated metal roof, I had an idea to paint my roof aluminium silver instead as it just proves that the more reflective the roof becomes the cooler it is. Thank you for your very well made and informative experiment.

Very good explanation for an interesting topic. I just have one critique. You should have used a contact temperature sensor like a thermocouple or RTD instead of an infrared thermometer. Infrared thermometers are convenient and easy to use but suffer from a serious (in my opinion) flaw They rely heavily on the emissitivity of the object. In simple terms, objects with high reflectivity (like your GI test sheet) will show lower than real temperatures. Also, generally speaking, dark colored objects will show a higher temperature than lighter colored ones even if they are at the same temperatures. The infrared thermometer you are using is optimized for human skin, not metal surfaces or even painted metals. However, even with this issue, I think your results are valid enough to convince me to go ahead with my plan to paint my roof white. Thank you very much.

Wow great video!!! I always though of paiting white, it's just that it's so uncual to see white roofs lol love it! I'll change mine soon too!

is it the same as the ceramic thermal coating for roofs?

Very good scientific break-down of things I’ve often wondered about! Thank you for sharing!!!!

Very Informative. Thanks you so much sir and God bless always 👍

Nice work, great infrared measuring

Does clear coat helps in maintaining the reflective property and anti corrosion of un-coated roof

I do not doubt that the white coated roof would be cooler the methodology displayed here is not going to yield accurate results. a few issues: 1. The infrared, non-contact, temperature measurement using two different surfaces without taking their respective emissivities into account, which are likely to be different, possibly significantly so (especially the uncoated metal, which will have a very low emissivity), could result in significant temperature reading errors. 2. Measuring the temperature at different times and different sun angles, and on sections of roofs facing different directions, and at different ambient temperatures, will definitely yield different temperatures. 3. Putting a thermometer in the sun will not yield anything like an accurate air temperature. Depending on the emissivity of the thermometer body, the temperature reading could be even tens of degrees off of the actual temperature. The outside temperature reading presented in the video was likely 10 or more degrees hotter than the actual outside air temperature.

Very informative video!

great experiment

Thank so much for this excellent video. It helps me to make decisions for our roof. I hope your roof continues to perform well. Great Job!

Which type of paint is recomended fo a tile roof in Thailand

everyone should do that, especially in tropical countries with much AC use

I just put white roof coating on my manufactured home. I live in the desert where it can get to 115 degrees. So far this summer I do not notice any difference in room temperature since coating my roof white. No, it does not help at all!

Thank you for the info.