Make Cob Stronger and More Water Resistant - Stabilized Cob Walls

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This Cob House

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Thank you brother! All the love and peace to you and all living beings!☮️❤️🙏🏻

CarlosCardenas-to

I usually make good stabilized rammed earth, but lately I’ve been experimenting with natural and no stabilizing and added too much sand and had an epic fail crumble away the other day.

SlytigerSurvival

Thank you so much for sharing. We'll done, now if I can build one I will be over the moon with joy. So wish me luck!

flowgood

Oh dear, more bad advice based on fear of water resistance.
Pozulan works well with lime as a render but adding it to earth with any clay content is the kiss of death. Many have made the mistake of stabilising Cob and mud brick only to find that after about ten years the Cob starts to crumble and break down.
What most called rammed earth is in fact rammed concrete.
Cob breathes because clay breathes. If you stabilise Cob you will kill everything that makes it work so well.
You must have three parts sand to clay and you must use plenty of straw. Thats the formula. Dont mess with it. Once have a roof on the wall you only need a thin lime render to protect it. Spray it on with a gun is easiest.

joschmoyo

Interesting the stabilizer gets stronger over time under water ⛲

sparkleonlove

Very cool, thanks for sharing. Can you layer the two? For example, could you add lime+pozz stabilizer to the mix for the first few feet but not add any to the upper majority of a wall (assuming there is a good roof, so the bottom section is the only part at risk of getting wet)?

ClareAndAlec

I am eagerly awaiting your further test results. Do you have any further reading recommendations on this topic?

jayway

If you coat with lime and protect it, you do not need a stabilizer.

palipali

In your experience, do you have to reapply lime to cob walls throughout the years?

Queen-jcfd

Can you use wood ash as pozzolain if you don’t live near a volcano?

DJ-ukmm

This is excellent stuff. Liked and subscribed.

jeremynicoletti

Rammed earth is the best because I’ve even seen it mixed with a little bit or mortar or cement mix.
Can you use the it with the other soil and get the same results as the rammed earth?

anthonyperkins

I heard about mixing latex paint into ferro-cement and then painting ferro-cement with latex to make it more water proof. Have you tried latex paint in the water for cob?

semperparatus

Since more water-resistant = less breathable, is there a way to measure or show whether this compromise actually balances out favourably as you mention end of vid? - As in does the pro definitely outweigh the con?

joe