Make Cob Stronger and More Water Resistant - Stabilized Cob Walls
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- Опубликовано: 25 июл 2024
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Thank you brother! All the love and peace to you and all living beings!☮️❤️🙏🏻
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!
This is excellent stuff. Liked and subscribed.
Thank you for making this vid👍👍👍
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.
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.
How well does the lime/pozzolan render breathe? Does it adhere to clay any better than just lime?
@@lenavoyles526
I am only using a very small amount of pozulan, which is in fact a kind of mineral clay.
Portland cement does not breathe. Never ever render cob with a cement render. It has destroyed cob walls on historic listed buildings that would have otherwise lasted another five hundred years.
does this come from actual building experience or just what you read about?
@@CS-kk4tm
Good question. Actual building experience.
Crumbly earth blocks no straw probably small amount of portland, cement top cap along long freestanding wall. Would you try a hurl coat to bond to crumbly sandy surface before lime/sand/manure/toilet paper scratch coat, render with lime and sand+pozzolan , would you do a metal or fiber lathe to bond to the soft bricks?
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)?
Loved the info !
Excellent
Interesting the stabilizer gets stronger over time under water ⛲
THANK YOU
What would recipe if I wanted to make blocks out of the earth , lime, pos shown in this video. What would you use for grout between blocks if want it natural as possible? Thanks
Would the 10% mixture work well for a basement in GA where it rains a lot? Actually it sounds like it would.
Can you use wood ash as pozzolain if you don’t live near a volcano?
If you coat with lime and protect it, you do not need a stabilizer.
Coating the walls with lime is a good practice for protecting the walls.
@@thiscobhouse stabilizer??
You mean cement??
@@thiscobhouse just plain lime, I have no clue.
What exactly keeps the dirt from rubbing off or falling off inside, so it does not get in lungs or all over.. please give me some detail. Thankyou your fan.
Harvey
I think I've also seen someone oil it with many layers too, would be curious to see the difference!
Can you use waterlgass instead of pozzolan?
Notth Mississippi here . Where can i find these items?
I am eagerly awaiting your further test results. Do you have any further reading recommendations on this topic?
Can't say that I do. Everything I've learned on stabilizing earth mixes has really just been word-of-mouth.
'Building With Lime Stabilized Soil' by Stafford Holmes and Bee Rowan. It's a must-have.
@@niallwildwoode7373 thank you for sharing this important information
Is he going to tell us what he mixed into the cob or go on all day about other stuff?
Thx for the Info. I have 2 questions.
1- Have you ever considered using Hemp fibres instead of straw to bind the material ?
2- Have you ever tried to build a cob structure using the 'Ram earth'' method or ''Hempcreet'' method using panels to guide & accelerate the building process ?
Thank you
I write just in order to wait for the answer :-)
Hemp fiber makes no difference, there is no chemical related process, compound, or related biostructure that shows that Hemp is different from straw. Any thicker "grass" will give the same substance to Cob. Hempcrete is the same as straw or any other aggregate over time. Hempcrete is the same as his "Ram earth" product, but with more additives, it's pretty much like making concrete, then mixing in a bit of hemp (or straw) to replace the rebar. So the concrete has some material that flexes inside of it, as concrete is not flexible.
But either way. Ram Earth is not stronger then concrete or reinforced concrete. Which is pretty much what everyone is making when they mix the lime and ash. Pozzolans is Fly Ash. Ash makes concrete. Lime is Concrete, it's what makes it water tight. Sand and rocks are aggregate. Which is Concrete. lol.
So all this work.. You are literally just finding mixes, to come back to the same thing. Concrete. lol
I'll repeat again. Hemp does not make anything different in the terms of chemical processes to make cob or making hempcrete.. Hay and hemp are the same thing in this process, which is just a flexible material that adds flexibility to the.... concrete.. lol
@@hawkintelligence Straw is added partially for structural/binding purposes, but also for insulation purposes. In the latter sense, they definitely are similar as they are both hollow tubes of mostly cellulose material. The difference being that hemp fibers have smaller tubes, and thus might be more insulative by reducing convection better.
@justinw1765 this is a solid tip. I'm going to conduct a study on this when I have time
What even is the stabilizer? Cause I don’t remember him mentioning it.
The stabilized block looks excellent. Did you hot mix quicklime?
I buy Type S lime in a bag.
How to Portland cement and lime & pozz compare as far as price and availability go? While I do want to avoid toxic materials, a tight budget is a high priority/presser for me.
The lime+pozz will be slightly more expensive than cement for stabilizer. Personally, I don't have a problem with cement for stabilizer. If there is any toxicity, its very minimal.
Most people just have a problem with the emobodied energy used to produce cement.
Maybe coat some regular cob with the lime pozzolana (like paint/lime wash) and test that it would be cheaper
In your experience, do you have to reapply lime to cob walls throughout the years?
I saw from other videos that it's recommended to give everything a lime wash once a year
Four coats of black soap or veggie soap castile etc or lindseed oil and it combines with lime to form a polyurethane
have you tried cement ?
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?
We would need a laboratory of some sort to measure this, I think.
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?
Yes, you can add either cement or the lime+pozz mix to any kind of suitable soil for rammed earth or cob.
That rammed earth test looks great. what pozz did you use. Also what was the rest of the ratio? was it 90 percent just dirt or was it a certain mixture of clay, sand, and gravel
All I know is it was pozz/metakaolin. I got it from a company in Georgia.
Yep, just 90% native subsoil with the 10% stabilizer.
Thanks for the response. How would you compare that rammed earth block to a block of concrete? If you put weight on those corners or pushed down would it collapse/crumble? Or did you find that it is relatively strong
Also, did you dry mix the soil, pozz, and lime and then dampen it while adding it in layers? Not sure if you already have a video on the process
Sir what is the ratio rammed earth wall.
And which the batter rammed house and cob house.l need your help.
Rammed earth walls are typically just 100% soil. Some are 50/50 soil and aggregate. Ratios differ by soils used, etc.
Rammed earth and cob are both great. They both have pros and cons. Please read my article here to learn more about the benefits of both methods: www.thiscobhouse.com/the-best-introduction-to-cob-house-and-cob-building/
How is the pozz spelled and where do you purchase it? Could you use DE in place of the POZZ?
DE is a completely different material from kaolin. Kaolin is a clay, DE would be high in calcium carbonate.
Pozzolan. Or metakaolin. I order mine from the state of Georgia.
Hi I'm new. Can someone explain the reason cob walls don't fall over?
The rain typically cannot produce enough water to "meltdown" your cob walls... especially if it has a sufficiently sized roof overhang and thick enough walls (18"+).
It would have to be concentrated into a specific spot and with an intense amount of force (kinda like water out of a firefighter's hose) THEN you would have reason to think your walls are melting.
Don't also forget your stick frames, rebar and straw/hemp are keeping everything held together better. lime plasters/ tadelakt are another way of putting thumbs on the scales by keeping water out on the outer walls.
EDIT: Another thing you will read in Alex's book is that centuries ago, people made buildings that were much like apartment buildings out of cob. They had to arch the angles on the sidewalls slightly (kinda like pyramids) because of how heavy they were and the cool thing is they're still standing to this day.
How many floors can a cob house have maximum?
there are lots of more then 10 story apartments made of cob in Yemen
What's the ratio of rammed earth-lime-pozz?
And what's the ratio of cob-lime-pozz?
It depends on what percent of stabilizer you want to add. So, if I add 10% lime-pozz mix, I subtract 10% of the total weight of rammed earth/cob mix and add the stabiizer in as 10% of the total weight.
@@thiscobhouse
I was also wondering on the lime-pozz ratio
@@freightshayker Oh! Yes, the lime-pozz is just 50/50 mix.
Sir, can this technique be used in Kenya?
Yes, of course!
This channel is the fuckin best! ty sir
Where is pozz available to purchase in the US?
I know it's available in Georgia. You can have it shipped pretty cheap too since its light in weight.
@@thiscobhouseIf you have any links on this I would love that. I did a few searches to no avail.
What if i use 10% cement insted of lime? It is ok?
Yes, sure!
Hello and good day,
How much lime per cup of cob?
I always measure by weight. Determine how much your soil and aggregate (sand) weighs, then subtract 10% (for example) from that, and replace that 10% weight with the stabilizer.
Thanks
@@thiscobhouse are you using s lime, slaked lime, or builders lime or buying the more expensive lime from Mississippi Lime? I need to go some experiments and wanted to know which I needed to go with. Hoping for the less expensive. Lol
@@karensprings4237 I've been using Type S lime.
@@karensprings4237 just curious where you buy your Mississippi Lime? I'm in Oklahoma and have not found a retailer yet. I'm looking for a 50 lb bag, not the rail car that Mississippi Lime is willing to sell me ;)
Duh, keep the rain off your daub to begin with!
Probably what the pyramids blocks were made from.
no.