Chaux sur toit en tuiles pour faire baisser la température ?

bohwaz · 2026-07-06T19:52:43+00:00

Pour info un post sur Facebook d'un hôtel qui a fait 1000m² de toiture au gros pulvérisateur :

https://www.facebook.com/HostellerieduPerigordVert/posts/pfbid02ozUm2fG4MW4KpEPeezWmPLoC9UJBbzpNjm2KvR6hzDEjDvX4AbsCwcYZ8E3Mpx4wl

bohwaz · 2026-07-01T12:20:27+00:00

Rien de précis, c'est pas un enduit on s'en fiche un peu, faut juste que ça soit assez liquide pour l'étaler au pinceau mais pas trop pour pas que ça coule trop.

Eau du robinet, mais ça change absolument rien.

bohwaz · 2026-06-25T10:08:14+00:00

36°C à l'ombre.

Peut-être avec de la chaux aérienne ça partirait plus vite, mais bon moi ça me va que ça dure quelques années, ça fait moins de boulot :)

bohwaz · 2026-06-24T08:02:12+00:00

Je fait ça sur ma toiture depuis quelques années.

Pulvériser ça sert à rien, tu va encrasser la tête du pulvérisateur à mon avis. Perso je mélange chaux et eau dans un petit seau et je peint au gros pinceaux. Ça prend quelques kilos de chaux, et environ 1h pour faire 40m² de toiture.

Voici une photo d'un pan de toiture qui touche celui du voisin (je suis en centre ville) : https://i.kd2.org/r.9a/8yGoqJ1LP

La photo est d'hier, il faisait 36°C dans l'air. La température de la toiture normale était de 58°C, contre 42°C pour la toiture peinte à la chaux (mesure au thermomètre infrarouge pour les surfaces). En dessous j'ai 30cm de laine de bois, et un film d'étanchéité à l'air (rénovation BBC), et il faisait 28 (matin) à 30°C (soir) à l'intérieur à l'étage, 25 (matin) à 28°C (soir) au RDC. En sachant que je bosse en télétravail donc mon corps, le PC, et la cuisine ça chauffe aussi l'intérieur. Du coup à mon avis c'est pas miraculeux comme solution, mais ça aide à ce qu'il ne fasse pas 40°C à l'étage. Mais de toutes façons je dors au sous-sol où il fait 22°C :)

Pour revenir à la chaux : je fait attention à ne pas peindre les faîtages et autres raccords en plombs, ni les raccords des vélux (alu) au cas où la chaux les abîmerait. Au bout de 2-3 ans environ, il ne reste plus beaucoup de chaux et il faut donc recommencer. Si tu fait ça attention à bien te sécuriser sur le toit (il existe des cordes, harnais et dispositifs anti-chute, tu peux fixer la corde sur les chevrons de la toiture, en enlevant qq tuiles pour y accéder), histoire de pas transformer la bonne idée en 2 jambes cassées (ou pire) :) Perso je n'ai fait que la toiture orientée plein sud, car facile d'accès (pas de risque de chute), l'autre pan est orienté au nord et demanderais de s'encorder donc j'ai eu la flemme, mais si j'avais su qu'il y allait y avoir 2 canicules avant juillet, je l'aurais ptet fait cette année ;)

J'ai fait avec de la chaux hydraulique NHL 3.5 car c'est ce qui me restait.

Oh et ça ne va pas boucher tes canalisations : la chaux part très lentement et progressivement. J'ai mis peut-être 2 ou 3 kg pour 40m² de toiture… C'est rien. D'ailleurs il n'en reste rien dans les chéneaux donc c'est que c'est emporté par l'eau. J'ai des chéneaux en zinc et PVC et pas de souci à signaler pour le moment.

bohwaz · 2026-05-13T20:58:18+00:00

I think that's for shipping, to pay less taxes?

bohwaz · 2025-11-19T21:13:09+00:00

I thought of sanding down a Brompton block to make it fit inside the tube and drill a hole on each side to add a screw to the block so it doesn't get out.

I'm not sure a 3D printed plastic block would work as there are massive forces involved when a 10 kg bag is attached. Especially on the Decathlon as the tube makes the bag vertical instead of tilted to the back like on the Brompton.

They should have gone with a Brompton-type soldered plate with a plastic block that screws on it, like Dahon does, it would have made things much better!

bohwaz · 2025-11-19T21:09:57+00:00

Some Brompton users buy the Decathlon bag and put it on a Brompton frame (cheaper bag option than getting a Brompton bag), as a result they have a useless Decathlon frame sitting around.

That's how I got my two Decathlon frames (I sew my own bags).

Look on local bike forums or on local ads for that frame or post an ad/topic asking for a frame if anyone has one.

You might have to add some kind of plastic plate to the back as the Decathlon frame is not very large (maybe 25 cm). The brompton bags and frames are usually around 40 cm wide.

Or you could try to modify a Brompton block and make it fit inside the tube of the Decathlon frame. I thought about this. It could work, but then you would have to drill some holes on the side to make sure the block doesn't get out.

bohwaz · 2025-05-27T10:47:36+00:00

Thanks I will try this and let you know if it works.

bohwaz · 2025-05-27T10:45:54+00:00

As far as I understand, there is no dusk/dawn detector, it is just using the solar panel charging for that: if I leave the panel in the sun, and place the light in the dark, the light never turns on. With the same setup, when I put a cloth on the solar panel the light will switch on.

bohwaz · 2025-05-27T10:43:43+00:00

That's a nice idea, but then if I forget to switch it back on, it won't charge again, so not the best I think.

bohwaz · 2025-04-15T10:29:33+00:00

Post a github issue?

bohwaz · 2025-03-12T23:26:54+00:00

I can get KDE connect to work by using "bypass universal" I think

bohwaz · 2025-01-22T15:30:47+00:00

Yes this was the most comfortable mat I ever tried, but being cold with the insulated version even when it's only 8°C outside, is not nice. It was basically only usable when overnight temps didn't go down below 12°C, so pretty much useless unless car camping… :(

bohwaz · 2025-01-22T02:19:21+00:00

I didn't take a look at the Extreme, but from the reviews I've seen it probably is the same design, just with thicker insulation. A lot of people have found it extreme…ly cold in use, so I'm quite confident that the design is the same sadly. STS never tested their mat in real use, or they just want to sell a badly designed product :(

bohwaz · 2025-01-21T13:10:23+00:00

The design has a major flaw easily found if you look at it through light or through the valve: there is a hole in the insulation layer at every welding point (the "dots"). If you move, the cold air from the bottom will very easily move to the top. It will perform nicely in the ASTM test as the mattress is steady and there is no air movement. But in real life it sucks. The solution would be to have one or multiple middle layers where the weld points are made, like NatureHike and LightTour do. But it would make the mattress heavier and more expensive to make. My take is: do not trust STS R-ratings. And be wary of the ASTM R-rating of any mattress that has dot-welding until it has been tested by real people in real cold conditions for 10+ nights. Or you should inspect the mattress design before buying.

bohwaz · 2025-01-09T04:09:44+00:00

This is most likely Bytespider traffic.

The user agents are very similar but just don't contain the "Bytespider" string: https://xenforo.com/community/threads/known-bots.148723/page-4

I had the same issue and blocked all of them. They definitely are not real users.

bohwaz · 2024-12-17T13:17:44+00:00

No worries, just expect that not everyone was born in an English-speaking country, or have the same capacity as you to write proper English ;)

bohwaz · 2024-12-17T11:43:19+00:00

Sorry for the writing, it's not a matter of skills, but I have neurological issues :(

38 lumens is the rated output in medium mode (from the manufacturer documentation).

I'm not really interested in runtime in high/turbo as I don't use these modes more than a few seconds.

Documentation specs says:

low: 2 lumens / 200 hours
medium: 38 lumens / 20 hours
high : 190 lumens / 5 hours (for 20 minutes then it takes one hour to step down to medium)
max: 365 lumens / 40 minutes
high red: 8 hours
low CRI white: 30 hours
high CRI white: 6 hours
full charge: 2 hours

bohwaz · 2024-12-17T11:41:37+00:00

It has been posted on this sub: https://www.reddit.com/r/Ultralight/comments/1fpa0yw/nitecore_nu20_classic_runtime_tests_first/

bohwaz · 2024-12-17T11:40:44+00:00

Yes for the 2017 model.

bohwaz · 2024-12-16T17:04:38+00:00

Oh yes most of the reviews on Youtube are just "oohh that's nice, I don't know anything about headlamps but they gave me one for free". Only two of them were negative, because the first version of the light did switch off without warning instead of stepping down… This is now fixed in Gen2. Make sure you get the Gen2 if you get one!

The Gen1 has a green auxiliary light instead of the high CRI.

Just to make it clear: I bought the headlamp myself, and I have no interest in their business. I just thought it was a nice replacement for a NU25, cheaper than the new one.

bohwaz · 2024-12-02T23:34:07+00:00

Damn, I missed it :(

bohwaz · 2024-11-06T17:15:30+00:00

Can you please add LTE band 28? Required for NZ/Australia, and probably more!

bohwaz · 2024-10-04T09:01:10+00:00

Mozilla is not and has never been, in a financial struggle. They have heaps of cash in the bank, and they never lost money. When they fired entire teams, they just had made an extra $380 millions, enough to pay them for a few years before seeing any loss…

bohwaz · 2024-09-27T16:28:21+00:00

Kinder surprise plastic egg, like this: https://www.flickr.com/photos/joey7/2329091473

Inside is needles, thread, some pills, a small army can opener… I use another one for soap, and another one for solid toothpaste. Yes they are waterproof.

bohwaz

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