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lime(stone) sand and clay

 
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Dear permits,

With great amazement I watched the video on YouTube from Survival Skills Primitive where in 2 guys build a small home without any tools.
I guess most of you are familiar with these guys or kind of YouTube clips. Amazing as it is it raised one big question in my head.
I started searching the fora over here and I could not find an answer, I did ran in many likewise questions from other Permies users.

These guys in the mentioned video, I'll link below the message, seem to making bricks as wel as mortar from just limestone (after somewhat preparing), sand and clay.
No surprise there YET!
What amazed me in the video is that they are using this mortar with above mentioned ingredients for the roof aswel, mind you the top layer of the roof with just these ingredients.
They did add some fiber.

Judging by the scenery of the video I imagine in those parts of the world they are bound to get some rain at a given time, maybe even a rainy season.
Thats when I got baffled, does this mix actually provide a rainproof product to withstand dripping rain or at least a little short shower every now and then?
Judging by the amount of bamboo them guys have growing around Im guessing there a lot more then just a little rain in this area.

Or maybe am I too easy to fool in believing this could actually work.
And will this build be washed away by the first rain season.

Sorry long story, I was under the impression that building with Cob made it mandatory to use a hat and boots.
Have these guys found the holy grale in natural building?


Im so very curious what my fellow Permies think about this.
Cant wait to find your answers.
And bet your ass that I m gonna try this myself anyway, no matter what you guys say.

Video link:




Thanks in advance...

Be good, be safe.
 
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Posts: 500
Location: Victor, Montana; Zone 5b
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Basically the individuals in the video are creating a lime rich mixture for the surface of the roof. These types of plasters are water resistant, but not waterproof. They will not last forever, or very long. With rain and sun exposure that type of plaster wouldn't last more than a few years before it started cracking or chipping away. For a long lasting cob structure, a water impermeable roof is best to shed water away from more delicate materials.

Will it work short time for a shelter? yes. But unless you want to put on fresh coats of plaster on an annual basis, there are better methods.
 
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