Ceramic Thermal “Insulation” Coatings vs White Paint.
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- Опубліковано 2 лип 2024
- Disclaimer: Surface temperature is an important indicator of the product reflectance but is not the only variable affecting a product's reflectance performance.
There is a lot of talk about cool roofs, and there are some companies out there trying to market ceramic cool roof paints. They ALWAYS demonstrate their products against every other colour except for white. So we do it for them in this video..
If a building does NOT have insulation, using a standard off-the-shelf white paint (White 16) or a solar reflective paint CAN improve comfort within a building during a hot summer day but not in cold winter climates (NASA technology Solar Reflective “Insulating” Coatings may propose to outperform standard white paint, but in this video, it was not the case).
White paint helps drastically in dealing with heat; ceramic Solar Reflective paints do NOT add a measurable difference to the performance of your building.
If your building has no insulation, consider using conventional insulation.
If there is insulation, consider the below retrofits:
•Repairing sarking/foil that is torn and ripped under a tin roof with foil tape may assist.
•Fix up gaps in the insulation on your ceiling.
•Paint your roof with an external white or light-colour.
Understand that real energy efficiency performance is realised by improving airtightness and ensuring that insulation is abutted consistently to this air barrier throughout the building envelope. A solar reflective coating does not meaningfully improve energy efficiency for cooling over a standard white (white 16) coloured paint if your ceiling is consistently insulated and airtight. And even if the ceiling isn’t consistently insulated, the roof area temperature is not lowered enough to make a quantifiable difference compared to plain white paint when using ceramic solar reflective paint/coating.
Some of these Ceramic Solar Thermal Radiant “Insulation” Coating products may offer better durability and longevity than standard white paint, however they are normally applied a lot thicker than traditional paints(250micron), which may add value to an asset. Ensure the supplier provides evidence of this.
For more information, see our web page dedicated to this subject.
efficiencymatrix.com/understa...
Some research papers:
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#nasatechnology #ceramiccoating #coolroof - Наука та технологія
Thanks for these informative videos. As an average home owner interested in renovations for energy efficiency I've learnt so much from them.
A well-explained simple comparison trial. I'll going to Bunnings right now for a tin of white outdoor paint!!!
i should paint the roof of my factory white
With anti-fungal additive.
This happens time and time again. The promotion of light coloured rooftops in summer periods.... and I'm all for it - but we need the whole picture. How do these rooftops perform in winter times? I have been told that a darker roof yeilds a better energy rating for winter time due to increased solar absorption. Which is tough because its a win loss situation, and requires balance to the ratio of hot and cold climate time periods for each particular climate zone.
For winter, the key is your insulation. with long and cold nights, the benefit of a "solar heated" roof is not enough to cover your losses at night.
I'm definitely no expert but I feel the affects of the summer sun would be much stronger than the influence of the sun during winter. Example would be I found the winter sun made practically no difference in my home without a thermal mass to absorb that low heat. A bit off the topic of this post though. Would be interesting to see some data from the affect of colour on the roof space temperatures during colder weather.
@@josephcheung3964 Ah it makes sense now, in winter your always losing (heat). With a dark coloured rooftop it only slowed the net heat loss during the day (if sunny). But I also remembered that dark colours also emit more radiant heat, so any gains are quickly reduced to a point where heat will begin to radiantly leak outwards.
So in conclusion light colours help prevent radiant heat absorption during summer AND radiant heat leakage during winter (as long as its paired with an appropriate insulation system).
Man I love it when I learn something new, thanks Joseph.
Right on!
Slightly disappointed not to use a factory coated White panel (e.g. colorbond surfmist, I know you intentionally are avoiding brand names). Probably wouldn't be much different given the other results but in the spirit of a physical demo like this I think it would be helpful for the average person. I also would have included a sheet of monument and shown the factory claimed emissivity values to compare that with the green and factory white. Data logging a graph of the temperature of all 5 samples over a day (preferably a mostly full sun day) and showing that would also be great. Good starter but would love to see you re-do this with those additions and make a follow-up video!
We made the decision NOT to use factory-coated white panel because we want to make an "apple to apple" comparison including the "application technique" and the imperfect finish.😉
We have another video coming soon with Dover white, and other common colour bond colours with and without a ceramic addition.
Totally agree
If you are doing another video I'd be interested in standard zincalume/silver colorbond.
Please include zincalume in this test
Do a black and dark gray compared to surfmist ect also does solar production increase on white roof.. and doea solar undo some of the white roof or not...
What about Barium Sulphate emissive paints? The reflective properties of paints and colours are well known. The emissive properties to REMOVE heat rather than reflect it is a different matter all together. The science behind them is good., but so far I have not found any properly commercially developed and evaluated paints.
That's an interesting product. However, we are not able to find an off-the-shelf product on the Australian market. We want to focus on commercially available.
I've had sunshield, a ceramic roof coating on an outbuilding of mine for 4 years. It's 8 degrees cooler than the white roof next to it. I use a high quality heat gun from work to get my readings. You can feel the difference
Prove it, make your own video. Show us all how much better your paint is than Dulux Vivid white! Freshly painted, with both. And use your heat gun, we would love to see it.
@ecoevo freshly painted doesn't prove anything. You need a few years to see how each will perform over the long haul.
@deelarry2137 Agreed, and we do talk about that.
@ecoevo yes, I should have Acknowledged that. I'm a simple man. I can walk barefoot on my ceramic coated (4years old) on a 110 degree day. On my white metal roof, its extremely uncomfortable. The ceramic roof has never been washed either. And it's just about flat.
The Nasa coating is for high reflectivity plus high emissivety. White paint is generally less thermally emissive so it will not radiate heat away as easily. This doesn't matter much when your main heat source is the sun but if you had a building producing a lot of heat it might start to matter. This is also made more important for nasa since you don't have an atmosphere to be conducting heat away in space.
i Should add this nasa coating probably makes it the worst option for variable weather since it should lose heat at a greater rate as well while white normal paints will emit at a slower pace.
Yeah, well, in this experiment the nasa coating was either not reflecting as well as white or not ditching energy fast enough to maintain a cooler temperature than plain white.
How did the prices differ? I’d imagine with NASA technology on the can, they’d want a lot more for it. But as mentioned it’s inconclusive, because a verdict would require the longevity test also. By the way that pastel green wasn’t even very dark, but still it was 25% hotter. I wonder how much hotter those maroon/terracotta color barns would be.
NASA tech paint that we obtained over AUD1,400 (yes! over au$1.4K) for 15L; AUS ceramic AUD378 (light colours) for 10L; Normal outdoor paint ~ AUD 310 (depending on brand and which hardware store you are getting it from white colour only).
@@josephcheung3964 Waw, almost 5 times as much. So if the normal paint lasts even 1/5th of the time (which it probably do better), it would still cost the same as NASA. Cool 👍
The prices were in the vid
@@drjimbarnes Ops, I must’ve looked away at that point.
How would a galvanised iron sheet roofing compare to the white sheeting .I have recently reroofed my 100 year old house with galvanised corrugated iron and it feels a lot cooler inside this summer compared to last year.
There is a video coming soon, comparing a whole range of colours, including gal sheet. We will produce a table of results on a web page too.
Does paint sheen matter? I've heard that high-gloss reflects more sun.
It may vary the emissivity, which may improve IR reflectivity.
None of these are in a box like they'd be on a roof. The tests are meaningless.
Please explain what you mean by this?
@@ecoevo A metal roof will hold more heat on a roof than simply sitting in the air.
Enconcrusive
Joseph knows and speaks two of the most difficult languages and likely more. What about you? Can you speak fluent Japanese? Are you smarter than Joseph? Are you a better person than Joseph? No. You are not, because your one-word comment exposes your racism and despicable character. I'd bet you're a Trump supporter