Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves

>

Darius the Dumb has posted yet one more #veryStupidByLowIQaa article.

On Sun, 16 Jul 2023 13:07:55 -0700 (PDT), a a <manta103g@gmail.com>
wrote:

>Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves

Roof yes, but interior walls?

We drove down from the Sierra crest yesterday. It was 82F at 7200
feet, 100F at 1000' (easy to remember), peaked at 109 near Sacramento,
and was 68 at home on the coast.

The hottest bit was a newly-paved, flat black strip of I80. Older
freeway lanes tend to be grey.

On Sunday, 16 July 2023 at 21:52:32 UTC+1, John Larkin wrote:
> On Sun, 16 Jul 2023 13:07:55 -0700 (PDT), a a <mant...@gmail.com>
> wrote:
> >Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves
> Roof yes, but interior walls?
>
> We drove down from the Sierra crest yesterday. It was 82F at 7200
> feet, 100F at 1000' (easy to remember), peaked at 109 near Sacramento,
> and was 68 at home on the coast.
>
> The hottest bit was a newly-paved, flat black strip of I80. Older
> freeway lanes tend to be grey.

White isn't necessarily the right colour. I've seen yellow paint be cooler in direct than the white it was next to. The eye doesn't see how paint behaves in IR, which is where a lot of the sun's heating energy is.

On Sunday, July 16, 2023 at 4:08:00 PM UTC-4, a a wrote:
> Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves

Doing things your way:

https://en.chateauversailles.fr/discover/history/key-dates/death-louis-xv-1774

Doing things scientifically:

https://www.nzherald.co.nz/lifestyle/smallpox-and-the-photos-anti-vaxxers-dont-want-you-to-see/24MJGHWAIJRJYD6LIPQ6ZTBKHI/

On Sunday, July 16, 2023 at 4:52:32 PM UTC-4, John Larkin wrote:
> On Sun, 16 Jul 2023 13:07:55 -0700 (PDT), a a <mant...@gmail.com>
> wrote:
> >Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves
> Roof yes, but interior walls?
>
> We drove down from the Sierra crest yesterday. It was 82F at 7200
> feet, 100F at 1000' (easy to remember), peaked at 109 near Sacramento,
> and was 68 at home on the coast.
>
> The hottest bit was a newly-paved, flat black strip of I80. Older
> freeway lanes tend to be grey.

Overnight low in Phoenix is projected to be 94oF for a brief time at sunrise. Overnight average is about a 100o.

On Sunday, 16 July 2023 at 23:27:07 UTC+2, Tabby wrote:
> On Sunday, 16 July 2023 at 21:52:32 UTC+1, John Larkin wrote:
> > On Sun, 16 Jul 2023 13:07:55 -0700 (PDT), a a <mant...@gmail.com>
> > wrote:
> > >Spray roof and walls of your home in white to save your life, exposed to extreme 2023 heatwaves
> > Roof yes, but interior walls?
> >
> > We drove down from the Sierra crest yesterday. It was 82F at 7200
> > feet, 100F at 1000' (easy to remember), peaked at 109 near Sacramento,
> > and was 68 at home on the coast.
> >
> > The hottest bit was a newly-paved, flat black strip of I80. Older
> > freeway lanes tend to be grey.
> White isn't necessarily the right colour. I've seen yellow paint be cooler in direct than the white it was next to. The eye doesn't see how paint behaves in IR, which is where a lot of the sun's heating energy is.

https://www.bing.com/search?form=&q=california+spray+roofs+white&form=QBLH&sp=-1&lq=0&pq=california+spray+roofs+white&sc=0-28&qs=n&sk=&cvid=9FF815449B47478FAB403B806D2E3CAF&ghsh=0&ghacc=0&ghpl
How much can painting a roof white reduce its …

WebMay 31, 2019 · It found that a clean white roof that reflects 80% of sunlight will stay about 31C cooler on a summer afternoon. The conditions would …

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WebEnergy Saver Efficient Design Cool Roofs A cool roof is designed to reflect more sunlight than a conventional roof, absorbing less solar energy. This lowers the temperature of the …
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>

Darius the Dumb has posted yet one more #veryStupidByLowIQaa article.

On 16/07/2023 22:27, Tabby wrote:
> On Sunday, 16 July 2023 at 21:52:32 UTC+1, John Larkin wrote:
>> On Sun, 16 Jul 2023 13:07:55 -0700 (PDT), a a <mant...@gmail.com>
>> wrote:
>>> Spray roof and walls of your home in white to save your life,
>>> exposed to extreme 2023 heatwaves

>> Roof yes, but interior walls?

Pointless painting the interior walls white. But it can make sense to
cover them with a thin insulating layer and a mirror finish though. The
stuff sold for putting behind radiators is ideal for this.

>> We drove down from the Sierra crest yesterday. It was 82F at 7200
>> feet, 100F at 1000' (easy to remember), peaked at 109 near
>> Sacramento, and was 68 at home on the coast.
>>
>> The hottest bit was a newly-paved, flat black strip of I80. Older
>> freeway lanes tend to be grey.
>
> White isn't necessarily the right colour. I've seen yellow paint be
> cooler in direct than the white it was next to. The eye doesn't see
> how paint behaves in IR, which is where a lot of the sun's heating
> energy is.

That is most unlikely. Pigment white paints have always been the
solution for passively cooled observatory domes with the whitest white
that money could buy used in the old days before air conditioning.

These days they use a grey mixed silver aluminium and white paint which
reflects slightly more sunlight and is warmer to touch but crucially
when it is dark does not radiate heat away like a black body.

White paint is a pretty good approximation to a black body in the
thermal band. They used to have a lot of problems with dome seeing
before they adopted the new generation of specialist dome paints since
the dome surface would supercool overnight facing the clear night sky
and drip cold dense air into the telescope enclosure. Now it stays at
roughly the same temperature as the air - metallic grains of aluminium
paint being very poor radiators.

These days you can get designer metamaterials that are cooler than the
ambient temperature when placed in direct sunlight. Just how well they
last up in real cooling applications remains to be seen.

--
Martin Brown

On 7/24/2023 4:59 AM, Martin Brown wrote:

> Pointless painting the interior walls white. But it can make sense to cover
> them with a thin insulating layer and a mirror finish though. The stuff sold
> for putting behind radiators is ideal for this.

One can buy drywall with a shiny foil surface faced outward.
Sadly, most of the masonary homes, here, rely on JUST this
as insulation. So, once the brick/stone/cement heats up
(over the course of days without cool nights), you're effectively
living in an oven.

> That is most unlikely. Pigment white paints have always been the solution for
> passively cooled observatory domes with the whitest white that money could buy
> used in the old days before air conditioning.

Yes. Here, many roofs are painted (rolled felt). Some folks opt for
*colors* thinking it's "special". Some try aluminized. But, "very white"
is by far the most effective.

The stuff I used most recently goes on with a bluish cast and dries to
a bright white (no idea what the blue is for except, possibly, to
let you see where you've applied new on top of old)

[Must wear sunglasses while up there, though, lest you go snow-blind!]

> These days they use a grey mixed silver aluminium and white paint which
> reflects slightly more sunlight and is warmer to touch but crucially when it is
> dark does not radiate heat away like a black body.
>
> White paint is a pretty good approximation to a black body in the thermal band.
> They used to have a lot of problems with dome seeing before they adopted the
> new generation of specialist dome paints since the dome surface would supercool
> overnight facing the clear night sky and drip cold dense air into the telescope
> enclosure.

Ha! Too funny!

> Now it stays at roughly the same temperature as the air - metallic
> grains of aluminium paint being very poor radiators.
>
> These days you can get designer metamaterials that are cooler than the ambient
> temperature when placed in direct sunlight. Just how well they last up in real
> cooling applications remains to be seen.

Yeah, the jury's out regarding cost-benefit.

Roofs take a beating, here, because of the unrelenting sun.
Plastics left out-of-doors are quickly compromised. Asphalt
shingles are impossible to walk on (to service the roof or
any kit mounted thereon). Ceramic tile stands up well but
is a PITA to repair leaks.

It will be interesting to see how the adoption of roof-mounted solar
plays out, in the long run. Given that leaks require panels to be
dismounted (disabling the cogeneration feature) to repair the leak.
Then, remounted and reinspected.

And, if the next rainfall is a week later, you're uncertain for
all of that time (do we have to take them off AGAIN?)

[The muni only allows residential solar to be installed on rooftops.
I suspect one can get approval for other mounts -- parking lots
erect a structure to shade the vehicles with the panels -- but
imagine the cost of hiring an architect and the uncertainty of getting
approval makes it a gamble WE haven't wanted to take!]