ฝัง
- เผยแพร่เมื่อ 21 ก.ค. 2009
- www.NJRenewableEnergy.com
US Energy Secretary Steven Chu said Tuesday the Obama administration wanted to paint roofs an energy-reflecting white, as he took part in a climate change symposium in London.
The Nobel laureate in physics called for a new revolution in energy generation to cut greenhouse gas emissions.
But he warned there was no silver bullet for tackling climate change, and said a range of measures should be introduced, including painting flat roofs white.
Making roads and roofs a paler colour could have the equivalent effect of taking every car in the world off the road for 11 years, Chu said.
It was a geo-engineering scheme that was completely benign and would keep buildings cooler and reduce energy use from air conditioning, as well as reflecting sunlight back away from the Earth.
I would add that by reducing the urban heat island effect (along with shade tree planting), white roofs are also the lowest cost adaptation strategy, directly cooling a city. So it is perhaps the one true triple play in climate - mitigation, geo-engineering, and adaptation - that is also both low-cost and scalable.
For people who found white hard on the eye, scientists had also developed cool colours which looked to the human eye like normal ones, but reflect heat like pale colours even if they are darker shades.
And painting cars in cool or light colours could deliver considerable savings on energy use for air conditioning units, he said.
Speaking at the start of a symposium on climate change hosted by the Prince of Wales and attended by more than 20 Nobel laureates, Chu said fresh thinking was required to cut the amount of carbon created by power generation.
He said: The industrial revolution was a revolution in the use of energy. It offloaded from human and animal power into using fossil fuels.
We have to go to a different new revolution that can severely decrease the amount of carbon emissions in the generation of energy.
Since I have been writing about white roofs and urban heat island mitigation (UHIM) for a long time, the readers who sent me this clip wrote:
Chu and Obama are listening to you on this!
While I suppose thats possible - Im told people at DOE and the White House do read this blog - in fact there is a far more plausible explanation. The person who introduced me to white roofs and UHIM more than a decade and a half ago, the person with whom I co-authored numerous articles on this subject - including this 1997 Technology Review overview article, Paint the Town Whiteand Green - is California Energy Commissioner Art Rosenfeld.
Rosenfeld co-developed this whole new geo-engineering analysis with Lawrence Berkeley National Laboratorys Hashem Akbari. You can read their non-technical summary, White Roofs Cool the World, Directly Offset CO2 and Delay Global Warming. And Rosenfeld is a friend of Chus, which is no surprise since they are both (brilliant) physicists and former LBNL scientists who focus on energy energy issues.
But provenance aside, if the U.S. Energy Secretary is publicly advancing white/reflective roofs at an international meeting, that means you can expect serious national and even international action on this important climate strategy. - วิทยาศาสตร์และเทคโนโลยี
Excellent video, and very valuable even after 8 years. Thank you.
This is indeed a great solution to saving electric in the summers. The problem is that in many many suburbs, the home owners associations have very strict bylaws/guidelines on what you can do to your roof for not only the color, but the materials as well... Until those rules are changed, you will spend more than the cost of your house trying to fight their lawsuits from them trying to make you replace the roof to within their guidelines. You can also get the ceramic paint additive to paint the exterior walls if you have a west facing "hot wall". Painting the west wall alone resulted in almost a 15 degree change of that one rooms sidewall.
Great!!!! Thank you for shearing !
Thanks for this excellent video!! One thing though, for very steep roofs, bright reflectance could be an issue (I mean visual comfort), BUT, for flat roofs and low steep roofs, it's the best solution ever.
Some people paint the sheathing as a radiant barrier, then install shingles on top. Probably less effective, but would have a normal look. Solar panels can also be obnoxious for the same reason.
I painted my roof last week with hydrated lime mixed with water. a 50 pound bag costs about 7 dollars.(available hardw.store). I bought 2 bags to cover my 1000 square foot house plus carport. my attic temperatures went down from about 140 degrees down to below 100 degrees. my house stays below 82 degrees all day and all night long now. I think what i used might wash off after a summer or 2... but it only costed me less than 15 bucks!!! My house used to be 10 degrees hotter (with AC off)
how long did it last??
my white roof is metallic, i am very happy to have done it, although in austria there is no such strong summer, but you have to prepare for the future. thanks for the video. Today I saw a video on Blomberg channel about white roofs in Barcelona, Spain.
Awesome! Awesome! Awesome video! Thanks for this.
Great job, man. I'm getting ready to apply a similar product called Maxx-Cool to a mobile home roof; the AC unit can't keep up with the mid-summer heat. I priced roof-overs and a product called Peel & Seal, but elastomerics seem easier to apply and are a lot less expensive than the alternatives. I didn't vote for Obama, but I'm happy to try this idea to help lower bills and extend the life of the AC unit. Thanks for a great video. Didn't realize it was good for shingled roofs too.
I installed a white roof last year and we could immediately feel the effects both in temperature and in lower power bills...this is NOT B.S.
Exactly. Did the same thing and had the same results.
@@Nightbird. do it get dirty..........when it does than what about the cooling effect....
@@samrajahangir4635 Yes they get dirty after a few years..and then you have to hire someone to clean it. But even under the dirt they still provide a cooling effect.
any white roof ?
@@ayc868 it got dirty after just 2 weeks
wastage of time and money
false ceiling is best optioj
This is a great demonstration of the effect of reflecting radiant heat. I love it. Thank you for this great documentation. I hope you find it to be as durable as it is effective. Please update this video if you choose to reapply at some point. Thanks!
If it is reflected, then where does it go?
is attic temp a big concern if your ceiling is properly insulated, such as with closed cell spray foam?
Very informative. Nice job!
I can see this being used is some applications but I don’t get why over composition roofing. Does this void the warranty of the composition roofing?
What if you have a few small leaks in your existing roof? Will this fix them? We sometimes get water during prolonged gully washers
Great job guys! I install this stuff in florida where its 95 + in the summer!!!
I used the Henry 287 White Roof Coating for my metal roof from Home-depot.
Does that work about as good?
im looking for a concrete coating that i can use between my cinderblock walls and the stone facade. my house is all concrete.
Would this also work as a radiant barrier in the winter? Seems like it would be much more effective to paint the entire house, but obviously cost more and look like an Igloo. This would be a great product to have on the sheathing before roofing and siding is applied.
This is awesome; we once had white rock roof it was great at our Condos however we switched to brown shingles and the temperatures when up a lot. Is there any product out there where you could cover your shingles (not solid white but clear) that would reflect heat just as well. It would have to be clear...or any IDEAS that would might help reduce the heat! Yikes, I'm in Arizona and it's really hot!!
Do you have the web page of the product? i've been searching for the product to model a home on a software for my engineering thesis using supertherm and i cant find the tech sheet with the properties of it. i would thank you a lot if you can help me with it.
Greetings
How is the painted roof holding up?
I need a response
Did you end up doing the rest of the roof or just rolling it on the spaces that needed it the most?
Great video ,i'm from Brazil and i Will make this in my house
great video i start paintin my roof too
I think it's great. This and green roofs would help lower the ambient temperature in cities too. NYC can get miserably hot in summer with all the concrete and tar roofs soaking up heat.
can I use this paint on my exterior concrete block home in florida, the radiation of this heated walls to the inside of the house is incredible
They probably have a concrete specific product. Ceramic paint can be applied to just about anything.
where did you got it and how was it? Good job
Thank you
Will it as so stop any roof leaks? It is bad when you have 30 year shingles and it is only ten years old and it leaks. Also I would not mind the savings on electric here Texas.
well done!
Yes, this coating, made for this type of application has ceramics that are "designed" for lack of a better word for mostly reflective purposes. However, I've also used their HSC (hot surface coating) against the sheathing between studs. This product uses different ceramics to prevent heat absorption. For instance, I hit it with a torch for over 20 seconds and could immediately touch it with my hand. I don't work SPI coatings, but i suggest going on their website and reading about it.
It cooled off fast but I will bet it reflected that heat back into the attic and took longer to cool.
What web site?
Ed would you still do this today or another solution like spray foam?
So how is it holding up... Does it get dirty quick
and how much was it?
Was wondering if this can be on shingles asphalt roof...Should hire a roofing contractor or a painter?
hello fellow nj neighbor, what was you before and after ac cooling savings and heating savings in winter? or what percentage can the average person save, suppose a 2 story home.
Thanks for the video. It was very informative. Where can I buy this product?
At 09:33 used it during construction on the inside of the roof! That blew my mind.
If anyone here doesn't get it or doubts it... return to Pre K, light color cool dark color warm in summer....
I used Henry Solar Flex 287. Cost was $340, annual electric savings since was $420 per year. I also extened the life of my worn shingles and the AC as it comes on less frequently. ROI 0.76 even the dumbest venture capitalist should get that one.
Hey how is your roof holding up after 6 years?? Can a thick coat of this stuff prevent leaks??
It's been 14 years, how did it hold up? If there a follow up video?
date: September 2023, where do I buy this? This is a ceramic product? Not silicone, silicone is not approved for asphalt shingles? Elastomerics are a 3-5 yr. product and not approved for asphalt shingles. I can't find the product in big box hardware stores nor at roofing suppliers. Second question: will the insurance companies accept this as a roofing treatment?
what's the brand of the product you used?
Yes, this is a good thing you are doing, I am very interested in it. Have you installed the solar arrays.
how slippery is it?(when dry)
this sound perfect for the summer time. now my question is how is it on the winter time when the tempetures are bellow 0 degrees? does it absorb heat to help reduce the use of the furnace or will the house be colder than usual?
During the summer, You should paint the roof white during the day to reflect the heat, and paint the roof black during the night to radiate the heat back to space.
During the winter, you should paint the roof black during the day to absorb the heat, and paint the roof white during the night so the roof does not radiate the heat back to space.
Awesome vid. Great idea to take temp samples all over and inside. I would request a matrix of each data point.
76 degree 80 degree
shingle temp 170 degree 101 degree
etc...
@the43k Wow, that's pretty expensive. My roof's 20 yrs old and was hoping to prolong its life with this system. The website says you need to put down a special base coat, 2 layers of super therm and a protective coat on top. Did you use these other coats? And if so, how much did they cost?
Thanks
It would be nice if you showed the temperature in the room before and after instead of the ceiling temp
Ceiling temp is the biggest issue as it will generate Radiant heat. Its just science, higher level of Radiant heat= more cooling needed. AC Systems cannot overcome excessive heat from the roof/ceiling.
The second floor is the same as what he shows here, minus the attic Space. So radiant heat from the ceiling is a big deal on our second floor.
since the beginning of man there have been haters in this world so sad great video very educational
No matter what you do in life, someone will always try to debunk anything new. I plan on doing this to my roof next spring.
And since the beginning of man there have been idiots who will obediently do what others will tell them without first checking the facts.
First of all, you can apply this product after the shingles have been subjected to warm temperatures in order to warm the adhesive. Second, even if you somehow applied the super therm immediately to the shingles, the roof will still warm to about 5 to 15 degrees above ambient temperature, so I suspect this would be warm enough to make them stick.
Could you link me the product you used I want to do the same to my roof, Thanks
How much does the stuff cost to coat a roof?
Yes, the SUPER THERM has been tested under the CRRC. The initial testing was on Solar only which is the Visual Light or short wave testing and the number was 83%. In the three year retest, the drop in reflectivity was 0.6%.
Interestingly, after 10 years, there was no drop in performance as tested by a Japanese architectural firm. Later, the same firm tested a 15 year old roof and found it only lost 8% of the initial reflectivity performance for solar.
Thanks for a great video NJRE? where do you buy Super Therm? I searched everywhere online but can't find it
This product can be used underneath the roof below the shingles prior to shingle installation or sprayed from the attic on the sheathing and rafters. As for larger size soffits, yes that would help, but not nearly like the supertherm. I don't care how big your soffits are, they are not venting a massive shingle area thats 170 degrees.
In 2008 I painted my conventional asphalt shingle pitched roof with elastomeric white roof paint (Home Depot: Henry brand; Lowes: Black Jack brand) using a 9" conventional paint roller on a stick and no primer. (The shingles were several years old in 2008. Don't paint without a primer first on new shingles less than 30 days old.) Am very pleased with the results. It cures leaks even before they start and cost 1/3 to 1/4 as much as a reshingle. Nine years later, it shows very little wear. It's immune from all but the most severe hailstorms, unlike unpainted asphalt shingles. It saves on cooling costs. Don't like white? Paint over the white roof paint with any exterior grade paint, in the same color as your shingles if you want. I painted the drip lip at the edge of the shingles too, with a paint brush, so precipitation touches nothing but roof paint until it hits the ground.
Kevin Pullman I'm thinking of doing something like that..to extend the life of my roof for another season or two...for budget reasons...my question is?.. i live in Utah...and we have four season cycles..that are dynamic..
The weather where you live sounds quite similar to where I live. In the nine years the paint has been on the roof, there has been lots of snow, wind, rain, high altitude intense sun and some hail. The roof shows very little wear and no damage from any of this. It took maybe four coats initially to completely cover the conventional asphalt shingles with no gaps where an uphill shingle lays over a downhill shingle. If you do this, and don't have any ponding areas where water collects after a rain, you should be able to get a lot more than one or two seasons more out of your painted roof. One tip: if you have a gap of less than 1/4" in your roof, paint over it. If the gap is more than 1/4", put aluminum tape over it and paint over the aluminum tape. Another tip: around the perimeter of your conventional asphalt shingle roof is likely to be galvanized nails about ever 1.5 feet or so to hold down the shingles at the edge of the roof. Put a small piece of aluminum tape over each nailhead before you paint. Otherwise, the nailhead may rust after a few years and make a rust stain on the white roof paint. You can instead wait a few years for the rust to appear on the surface of the white roof paint, put the small aluminum tape piece over where the nailhead is and apply a little paint over the aluminum. That's what I did, since I didn't know the rust stain would appear. The roof would have likely been fine without doing this, but I just didn't want to look at the rust while on the roof. The rust is not visible from the ground.
I used the cheapest grade of Home Depot: Henry brand or Lowes: Black Jack brand elastomeric white roof paint. The more expensive grades didn't seem worth the extra money. The more expensive grades have a longer guarantee, but the inexpensive grades last very well (nine years so far with very little wear). The more expensive grades are a slightly brighter, more reflective more insulating white than the less expensive grades. Some labels on the white roof paint caution against using on shingles. Don't believe it. You can safely apply the elastomeric white roof paint directly on the shingles. Just use primer if your shingles are new (less than 30 days old), otherwise the white roof paint will bubble up from interacting with the fresh asphalt in the shingles.
I have hail damage. Contractors to busy and shy of my 12 pitch and low ins settlement. Ins canceled me so never see depreciation on top of it. Half of my 10yr old roof is good anyway. Just have finicky jerk neighbors that might laugh at white roof so will paint to match,,,somewhat. I don't think I need to "seal" the shingle bottoms unless area took a direct hail hit. Should have less worries about what others are saying about moisture problems. My roomy attic has huge gable window vents(my design). I wonder if the problem(paint/seal) roofs have poor tiny venting stuffy crawl spaces in the first place. I love a hack so this paint sounds, um, cool. I am also considering steel on my one layer of shingles since steel is supposed to last longer anyway. I see steel put on over shingles with and without a board separation so will have to research that also. Thanks for your info!!!!
Yes, agreed. I conceded that point 8 months ago below. I hope you got more out of this video than just spending the time to point this out.
Sir we can use any white paint because in our country this paint not available.
The ceramic make up of SUPER THERM is not dependent on reflectivity alone. The ceramic blend does not absorb heat which is the main purpose of the coating. Reflecting heat off the surface is important, but more important is the ability of the coating to resist the loading of heat to block the heat load to the surface or envelope of the building. If one blocks initial "heat load", the true insulation effect has been met.
Wouldn't the positive effects be negated by the roof being cooler in the winter, requiring more heat to run in the house?
@Umaxen Yes, but SPI makes a coating that is better for thermal transfer,rather than supertherm that is combination of reflect-ability and insulative coating.
in the northern states like ny and nj where the winters are very cold wouldnt a black roof be an advantage to absorb heat from the sun and keep the house warm? But then it would be harder to cool over the summer? Its hard to say what would help the most...
maybe just a light gray roof for average all year around performance?
With a coating like this on your roof, you're also sealing the roof so that the heat inside during the winter will be more likely to stay there. Most roofs lose a lot of heat during the winters, so you're not gaining much if any heat from having a dark roof during the winters.
Is there any value to that heat in the winter , that you are now reflecting?
Yes, there is a value but its very limited at best. The benefits of reflecting away heat in the summer out weigh any winter absorbtion benefits. Furthermore, if your home is taking in heat thru the roof and walls, it indicative of problem you have of heat loss when the sun isn't warming it up. Super efficient windows facing south or solar thermal collectors are your best way to get free heat during the winter.
+msa1985 everyone gets used to the heat. it's when you go from one extreme to the next without letting your body climatize.
No, not everyone can get used to extreme heat. The elderly (yeah, 60 is getting there) have less capacity to get rid of body heat, they don't sweat as much, and often can't feel that they are getting too hot. We see this every summer when we get old folks in heat stroke because they live in top floors of housing units, and don't turn on their A/C in order to save money.
This product has thermal properties, so its not bad in the winter. It will resist heat leaving thru the roof. Winter BTU's into house are limited anyway. Regardless, your savings is so great during the summer it would out weigh the loss in the winter.. But there isn't any.
also will this material crack after a few years from weather, how durable is it?
how can I purchase this product?
It is sold thru distributers/installers. Where do you live?
where can you buy these two products, I am in N.C. USA
Water based? How many rain seasons can it handle?
0. it's never too be used on shingles. it will either trap water or wash off
thanks
So your saying this also helps with the winter heating bill. Thats interesting. I wouldn't expect that.
@the43k As commenters are trying to point out, the effect is almost entirely due to the reflectivity of the paint, which has nothing to due with the insulative value of that the ceramic material does (or doesn't!) supply. The folks that make this kind of paint do a clever sleight-of-hand trick regarding the "technology" they use. At the thicknesses of paint, only an aerogel would work (tho expensive and damn hard to work with). Good idea, but save the premium cost of this paint for elsewhere.
very interesting
Where can I buy this in Florida?
@the43k yeah..sorry for being nitpicky! But tell me..what have you found out about this stuff? I'm considering buying a 40' container and turning it into a house. I wonder if a coating of this would help, inside and out, instead of using inches of foam..
Where can I buy this product?
How is the Super Therm holding up in 2022?
Excellent idea ppl on the west coat have been using white on asphalt it works. 🔥🌞States understand this problem.
Where I can buy this product.
how to buy it?
this stuff looks awesome - my roof is already white - may try it on the back of the house facing SW
Front will have 10-14 solar panels soon - where do I get this stuff-
ALSO GREAT VIDEOS on the Solar installs and Microinverters very detailed
I wonder how hot it gets when it’s like 110 degrees outside must be a furnace
@dieselplow
When I had a townhouse in Scotsdale I thought about painting the whole house with a reflective paint. I found that most paints can only be used on a flat surface or one with a gentle slope. CoolnCoat is one that can be used on a flat, sloped or vertical surface. There may be others. Good luck.
White roofs decrease precipitation by 4% through white roof reflection (i.e. less rain). Nothing beats mother nature green surfaces. She picked green for a reason.
the roof will reflect light in the winter when you want a warm roof. What do you think?
For one, the angle of the sun in the winter is far lower and the amount of heat gain is greatly reduced. 2nd this is not paint, it's a insulative coating. It will keep the heat inside the house from escaping thru the roof.
can u give an update
goto SPI coatings online... Been awhile I forget the cost, they will have a distributor in our area. Good luck
I am from New Jersey...where did you get this stuff?
Great idea and amazing Job!!!
I love the idea of painting my roof white to lower the heat in the house. Where can I actually buy this paint? Thanks!
I want to know if this coating can be applied to a rubber roof.
yes
the43k Our rubber roof is overdue for it's normal re-coating. We've just been waiting for the weather to cooperate so we can get it done. Please tell me where I can find instructions for using THIS product instead of the coating we are used to using.
go to my business website and contact me through email. thx
+Linda Dalton
These product is on Home Depot , you can ask there .
Pretty decent results. I wonder how things would have been if you painted the entire roof instead of that small segment.
What happens if you paint a color on top of it????
any updates would be greatly appreciated ......nine years later
Raymond Baumann c he's probably homeless or dead since our genius presidents bugs were released.
You just voided the manufacturer warranty on those shingles. Also this is not made for Shingle roofs. Shingles are meant to let the roof breath. Believe it or not roofs are meant to have air circulation. I suggest you put some more vents because you will have extreme condensation due to high humidity. Also water will find its way threw.
Ironically, this roof no longer exists in this form. It was replaced with a white metal roof to support solar panels. That said, your concern could be a valid one, but the science behind it should not be forgotten. White roofs prevent heat loading and should be used whenever possible.
If water will find it's way through, so will water vapor and air.
The product I've been reading on says it does not void warranty and allows air to vent through shingles
@@user-rm5oj4ew9q You will need to contact your shingle maker, none I know of will maintain the warranty with such a coating and im an installer. This sort of coating is mainly only used for metal roofs, especially those with some age on them. Area also several types of white coatings now
I thought painting the roof causes moisture under the rafters and causes mold.
@1framistan Isn't that what they used to call white wash?
can you spray it on?
yes
I went to your site and then click on "where to buy" it said I could purchase it at Home Depot but the Home Depot site says it has been discontinued. Just wondering why? And if there is somewhere else I can purchase it. Thank you
www.omnifloorings.com
Effie Deshazier probably because they recommend putting it over shingles.
Effie Deshazier probably because they recommend putting it over shingles.
@the43k And don't forget, in wintertime, roofs are often white anyway (snow, right?)
How long does it last before you have to redo it?
Great product for great applications, I wouldn’t put this on asphalt shingles ever again
@@NJRESolar Was this a misspeak? You "wouldn't put on asphalt shingles again" or you don't need to put it on again?
@John Foley In another reply, he mentioned that by sealing the shingles, it trapped water and did not allow sufficient drainage. I suspect it also did not breathe well (8 perms at minimum thickness). Shingles need to drain and breathe. If the application hadn't blocked off the gaps between and beneath the shingles, it would probably have been alright--i.e., as a coat, not a sealant.
Where can i find this pain? I can't find it at Home Depot nor All American.