The Incredible Effect of Coating Our Roof w/ Acrylic White Paint!
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- Опубліковано 28 вер 2024
- The part of a house that sunlight heats up the most is the roof, simply because the sun traverses above us. And the amount of heat that a roof absorbs depends on the color of its coating. A typical roof absorbs 90% of the heat coming from the sun. Dark-colored roof coatings absorb more heat compared to lighter-colored roofs. And in this project, we’re gonna put this concept to the test by painting our roof white.
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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.
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.
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.
@lylelaney8270 you may be correct but the heat rejecting paint is not all about sunlight reflectance, but IR reflectance as well. I painted our roof with Boysen Cool Shades (Reflecting White), and the difference is massive even for a single coat. Mind you, our ceiling to roof is only 2 feet. Before painting, our AC struggles and the ceiling gives us headaches even with AC on. At 9-10AM, you will be woken up by hot ceiling even with AC on. But with the paint, even 12NN or 1PM is very mild and AC is set to very low. And this is without foam insulation.
Between foam insulation and an IR reflective paint, I would choose the paint. It is cheaper and easier to apply. Foam insulation is expensive and laborious to install. But well, it gives better heat rejection but at a price.
@@michaeljohnjugar703 Boysen Cool shades and a few others paint brands do provide heat resistant but it's not necessarily due to the color but the formulation of the paint though, at least that from what I gather. I agree with on foam insulation. It's expensive and troublesome to apply and to dispose.
Well, I would consider painting the roof and install insulation foam. That might be costly but two working together will definitely make the room far even cooler that even just using standard fans directed at your window as if a makeshift ventilation to replace the warm air inside the room would be enough if you really want to save energy to the point of not using Air Conditioner.
@@dgreater1 If you install the foam insulation, the effect of the temperature difference between the painted and unpainted roofs is negligible. If you could afford foam insulation, you could definitely afford the cost of running the air conditioning. Also, I don't think it's necessary for the tropical equator zone. Just some cheap heat insulation would suffice, in my opinion. We don't turn on the AC all the time; it's not because we desperately need to save. It's just unnecessary. On a regular day, opening up the windows with a low-to-medium setting on the fan is enough. However, our house is surrounded by trees and vegetation which might be different from other people's.
@@lylelaney8270 The point of painting the roof is so that it doesn't absorb heat that would be dispersed to the whole area. It's like in a car, even if you have insulation foam inside, if the car absorbs too much heat from the direct sunlight because of its color, it would penetrate inside and make it like a huge oven. It's the same with houses, the best way to prevent such thing is prevent the body from absorbing too much heat from the sun and there are different methods for that, one is painting. Also, being surrounded by trees and vegetation definitely can help a lot with shading which prevents heat from accumulating that much. Also, another method that could be used instead of painting the roof is put UV shade nets and totally block the sun from heating the roof. If it's concrete type roofing then that's a different thing.
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.
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.
Thank you so much!
Nice work, great infrared measuring
Thank you! Cheers!
50°C and 100°C are relative temperature readings, which means one is not half as hot as the other. One simple way to illustrate is that 50°C = 323K and 100°C = 373K.
Very Informative. Thanks you so much sir and God bless always 👍
Thank you too
great experiment
Thank you 🤗
Excellent video; thorough & scientific! 👍🏻
Unfortunately here in France there are regulations on what colour your roof is! , ( The roofs in same community must conform to local rules on roofing materials & colour..🙄). Most roofs here are ceramic tiles. New buildings must conform to latest standards for insulation, so things are gradually improving.. Because of our l'attitude difference between summer & winter is more extreme - so good insulation is important to protect against too much heat entry in summer and too much heat loss in winter..
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.
You make terrific videos. It shows that you prepare your ideas, create a script with corrisponding sub video content and then put it all together. Hope you efforts are paying off from UA-cam.
Wow, thanks!
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.
Which type of paint is recomended fo a tile roof in Thailand
Very informative video!
Great work... thanks from India
thanks.. its very informative...
thank you i learned a lot
Glad to hear it!
Why is the green roof 50.8 and almost on the same side, a bit higher at 51?
Sayang, di mo na try ang Boysen Cool Shades. Acrylic pero may infrared reflecting pigments. Mas malamig kesa sa white paint lang. Pero pwede na rin ang white paint.
So why do builders paint roofs green or red in the first place? Must be cheaper?
Yes, because greens and reds are much cheaper, about P400 per 5 gallons last i checked.
Paano po pag kulay red ung kulay ng bubong. Nabasa ko sa net na pwede din daw ang red at nag rereflect ng heat? Need help kasi sobrang init ng panahon ngayon.
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!
Nice
Great video!
Hawaii reflects better than anything even polished metal that's why NASA Paints the Rockets White
Spray your hose on the roof at the hottest part of the day. My roof drops 60 degrees when I wet it mid day in summer. Have fam who swear it can assist or replace using AC. Do t need a lot, just wet it. Becomes some type heat sink, as far as I can understand
Not only heatsink, but evaporative cooling, changing phase from liquid to gas takes a lot of energy.
eto na ata pinakamagaling na video na napanuod ko. very informative.
Salamat po
I thought it was here in Brasil
A difference of 1° C is equal to 1.8° F. Don't just convert, convert and then subtract.
$162.00 to pay TWO Contractors for 4 Days?? That's only $20.00 per day per contractor or $2.50 per hour ?? Is this enough to live on where you live?? 🤔
I built a house in the Philippines that's actually good money for this roof job the average pay there is $1 an hour
White roof: colder in Winter.
That would be a good thing in the Philippines.
what is winter?
All your measuring is flawed because you use a Infrared thermometer (wrong).
You should read up on Emissivity or thermal imaging principles.
That way you will also understand that the galvanized steel is in fact not cooler, its just a measurement error.
I think u used the wrong type of paint..why use Roof Guard if ur principal goal was to reduce the heat on ur roof.. u should've use the heat reflecting paint instead...though u proved something about white being the primal color to reduce heat
Sarking would probably make more sense in this situation and it's insulating properties are more effective than heat reflective paint.
Funny in the Philippines where its hot, Filipinos always go on dark colors instead of choosing colors that match the climate like how arabs built their houses...
Yeah ph houses are heavy inspired by cold climate houses rather than tropical houses.
brighter colors can become dirty because of the weather (mud splash,mold). same case here in indonesia.
everyone should do that, especially in tropical countries with much AC use
i was a union sandblaster/steel painter for 15 years and went to decorator after, i have worked in protective coatings at LTV steel, US steel, Inland steel, bethlehem steel, intech steel, and have relined huge steel storage tanks in tank farms all over the south and west of lake michigan.
i retired to the philippines and built a house beside the ocean with my own 2 hands that was designed by me as well.
my roof is corrugated steel, the 'wavy stuff' its rather thick and i had it trucked in from some distance. it's screwed onto 3/4 inch plywood resting on 2x6 'philippine mahogany' rafters every 4 ft on center with 2x2s as purlins (nailers) every 4 ft (but they are flush so not really perlins).
I cleaned the sheet metal off with rags and MEK to remove any oily areas or dirt and primed it with 2 coats of iron oxide(both sides) before installing it.. after it was all screwed down i touched up any small scratches and screw heads then used white industrial enamel oil paint, 3 thin coats on that.
that was in 2017, in 2023 i washed it down with soap and water and rinsed it well then hand sanded a few spots that looked like they may need it and recoated it with 2 more thin coats of white oil enamel.
it still looks great and it has lowered the temperature in the house by reflecting the hot sun dramatically, you can touch any bare metal here at noon and it will burn your fingers. my roof feels like 65-70 degrees at noon. i have had zero rust(even beside the ocean) and zero coating failure and zero leaks.
the temp here never varies too much staying between 65-95 degrees F so the expansion and contraction is not a problem , (and even less of a problem after painting since it stays between 65-75 degrees now! ).
anything can be painted if you know what you're doing and use the correct materials.
edit - i used galvanized screws with little rubber gaskets under the heads (dont over tighten and smash the gasket!)
what if this had been a SILVER-COATING, instead of White? Don't forget to add RADIANT BARRIER paper UNDER the Roof Sheathing. BIG difference, friends!!!
Your test is not accurate as the dark side of the roof is still heating the attic which is being transferred to the white side from the inside
The green part is facing the sun Of course it's going to be hotter
Am I seeing bare feet on that roof. Hope it wasn't hot.
Very good scientific break-down of things I’ve often wondered about! Thank you for sharing!!!!
Glad it was helpful!
Subscribe & Like Done🇵🇭
Informative video!
Adding to white roof paint, what would happen if you install several turbine ventilators on the roof? Will the ambient temperatures inside the house decrease further?
Should be painting it blue ... remember Maui?
????
Which is better sir silver or white?
White
recording with a Thermo laser pointer i can contest with 100 degrees outside direct sun no shade the aluminum roof is 190 degree. i coayed in and out of the roof with The rubberized elastic coating and saw a significant drop to approximately 150° along with the coating I installed the foil styrofoam bubble wrap insulation with the foil side facing up to the aluminum roof and saw another 20° drop to about 130 on top of those drops I also noticed that the radiant heat dissipates much quicker and does not linger as the aluminum roof did before without it after the sun went down the radiant heat would stay for hours if not throughout the whole night now within the hour it's almost ambient temperature this combined with a water cooler My garage is now completely workable in the hottest days unlike before completely and utterly gasping unbearably for air could not work in whatsoever you would die
Dark colors absorb heat, lighter ones reflect heat.
I recently saw something called Thermal Powder that would be mixed in with the roof guard paint. How is acrylic paint different with the thermal powder mixed paint?
how about painting the roof with metallic chrome painting. would this be cooler since its highly reflective?
that entire project in the United States would cost a grand total of like 20,000 usd
Aluminum silver is great, second is white, plus air vent on roof to cool your entire house, 🏡
Does clear coat helps in maintaining the reflective property and anti corrosion of un-coated roof
You should have replaced all the nails with scews to eliminate them from loosening.
Could you have sprayed the coating on?
is it the same as the ceramic thermal coating for roofs?
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!
Glad it was helpful!
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!
go for it!
I feel Silver should beat out White by a bit.
Thanks. Cheers from Canada.
Welcome!
Thank you for the info.
Any time!
A change of 10 degrees Celsius corresponds to a chhange of 18 degrees Fahrenheit, not 50 degrees Fahrenheit.
Whoa! You sure? I was using a temperature converter the whole time, because I've been used to using Celsius and I wanted to make sure I didn't mess up the conversion. I double-checked -- still shows that 10C = 50F (0C = 32F; 1C = 33.8F; 5C = 41F, etc.). Did I mess up?
@@HanDIYman007 "Whoa You sure? ... Did I mess up?" In a word: Yes. The banner says "10 degrees Celsius cooler". That's a statement about a change in temperrature, not about the tempererture level itself. A drop in temperature from, say, 35 degrees Celsius to 25 degrees Celsius, corresponds to a change from 95 degrees Fahrenheit to 77 degrees Fahrenheit, and hence to drop in temperature of "just" 18 degrees Fahrenheit -- not 50 degrees Fahrenheit.
The conversion is F =1.8 * C + 32
But if you are going to measure the delta (change) in both sides you need to use differential on both sides
Thus, delta F = 1.8 delta C
So a change of 10 deg C -> change of 18 deg F
The complete formula to convert C to F is "F=(1.8*C)+32". To say that 10C is just 18F is incomplete because you still need to add 32. Therefore 18+32=50.
@HanDIYman007 you are wrong. The conversion you mention is for the actual reading, and not the change in reading
For example 10 deg C -> 20 deg C (change of 10 deg C),
The F counterpart is 50 deg F -> 68 deg F (change of 18 deg F)
Have you tried silver colored acrylic paint.
White paint is much better at reflect the heat of sun than silver
WHATEVER BLAH BLAH YOU LOST ME AT THE START WITH ALL THE CLIMATE CHANGE STUFF MAYBE YOU SHOULD HAVE CONTROLLED YOUR POPULATION GROWTH