That's the way to go. It will dry much quicker than ply or wood forms and you can make each lift much taller without worrying about slumping. Well done. That's a real breakthrough method. I like it.
What do you think about this: provided there is a lift available or crane. Building whole walls while they are placed on the ground. The whole wooden structure would be laying on the ground, you put mixture of straw and clay inside the panelling and then use soil compactor to ram the mixture. Then when it cures lift it with a crane and put entire walls in place ?
Hi Alex - im so happy to see this - heard about slip form cob only recently and its just what we want for our house build in Australia. An engineer told me it wouldnt be load bearing - any references you can point to on this?
Great video. I would recommend to reuse your top hole when moving the panels up so as not put to consecutive holes above each other which could cause weakness over time. Cheers!
Looks a little too standard and boring for my taste, but then again ive never been a huge fan or 90 degree angles. Probably makes ot easier to pass inspection tho
Does the straw go into the mixer with the soil and aggregate or mixed in afterwards? Also, do the threaded bars just sit on top of the first lift of cob wall or do they rest on something to protect the walls?
Hi Jennifer, I don't have a set date for completion since we'll be working on this building sporadically. It's something that could be built fully in a few months though if you have all the money and resources available upfront. I am definitely finding the slipform cob to be faster. At least 2 to 3 times faster than traditional cobbing.
If you wish to hang items on the wall after all is done, like a photo frame. Can you use a normal “nail-in” or “fisher plug” like you normally would in a brick or plastered wall?
Yes, in most cases. Masonry screws are also good. But I do stil recommend pre-planning where you want to hang heavy things and install wood anchors into the wall.
Have you tried using soil compactor that would fit between those two wooden frames ? It would save soooo much labour. I guess you did, what went wrong ?
The brick is what we refer to as a stem wall. The stem wall can be decorative, but also functional. It lifts the cob walls off ground level to protect them.
If you do not have this brick “stem wall”, what ways are there to protect your cob from water damage? I assume thats about the only reason you have the “stem wall”?
What time you was done with all these materials you'll be better off just building a regular home unless of course you're getting paid for the workshop
You get what you put in. Faster building is not always better. A cob building done right will last much longer than a conventionally build one, and the indoor health and energy saving benefits are priceless.
I guess the first long message didn't show. Building a 60' wall 8' tall with 10' foot forms. How do I join courses vertically. How long to dry before next course. Thanks again
Just cover the walls with some tarps or plastic. If the raw walls get rained on, it's honestly not even going to hurt them though. It might just cause some surface aesthetic damage.
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in all my years of cob research this is the best system Ive ever seen
That's the way to go. It will dry much quicker than ply or wood forms and you can make each lift much taller without worrying about slumping. Well done. That's a real breakthrough method. I like it.
What do you think about this:
provided there is a lift available or crane.
Building whole walls while they are placed on the ground. The whole wooden structure would be laying on the ground, you put mixture of straw and clay inside the panelling and then use soil compactor to ram the mixture. Then when it cures lift it with a crane and put entire walls in place ?
Thanks heaps for your generosity with this fine intellectual property gift
You're welcome!
😎👍 Hyperadobe bags would work well with cob they are easier, but that looks like it's working, and maybe saves some money.
Hi Alex - im so happy to see this - heard about slip form cob only recently and its just what we want for our house build in Australia. An engineer told me it wouldnt be load bearing - any references you can point to on this?
Great video. I would recommend to reuse your top hole when moving the panels up so as not put to consecutive holes above each other which could cause weakness over time. Cheers!
Seems like just as much work as a rammed earth home but with a looser material.
Do you have anything for wind zones requiring solid rod ties from foundation to top sill.
Looks a little too standard and boring for my taste, but then again ive never been a huge fan or 90 degree angles. Probably makes ot easier to pass inspection tho
Does the straw go into the mixer with the soil and aggregate or mixed in afterwards? Also, do the threaded bars just sit on top of the first lift of cob wall or do they rest on something to protect the walls?
Hey Alex. How long before the office is complete? Do you find this method is faster than traditional cobbing? Thanks for sharing.
Hi Jennifer,
I don't have a set date for completion since we'll be working on this building sporadically. It's something that could be built fully in a few months though if you have all the money and resources available upfront.
I am definitely finding the slipform cob to be faster. At least 2 to 3 times faster than traditional cobbing.
Would you be willing to sell the forms or a DIY on how to make them?
amazing videos as always
If you wish to hang items on the wall after all is done, like a photo frame. Can you use a normal “nail-in” or “fisher plug” like you normally would in a brick or plastered wall?
Yes, in most cases. Masonry screws are also good. But I do stil recommend pre-planning where you want to hang heavy things and install wood anchors into the wall.
Are you going to plaster the cob walls? If so, will the plaster be flush with the brick stem wall, or will it protrude?
Yes, it will protrude slightly, which is normal.
Have you tried using soil compactor that would fit between those two wooden frames ? It would save soooo much labour. I guess you did, what went wrong ?
Curious also about the dual wall system, like cobbauge. Will you show your technique in an upcoming video in the future as well?
Looks more like rammed earth to me. I'd like to see more about rammed earth.
so cool, Alex!! I can't wait to come to another workshop and learn this new method!
Can't wait! Come on out!
simply wow
What do you do about all the holes left over in the walls from the threaded rebar?
I don"t underdstand why that is on brick
The brick is what we refer to as a stem wall. The stem wall can be decorative, but also functional. It lifts the cob walls off ground level to protect them.
If you do not have this brick “stem wall”, what ways are there to protect your cob from water damage? I assume thats about the only reason you have the “stem wall”?
What time you was done with all these materials you'll be better off just building a regular home unless of course you're getting paid for the workshop
You get what you put in. Faster building is not always better. A cob building done right will last much longer than a conventionally build one, and the indoor health and energy saving benefits are priceless.
I meant vertically doing ten foot section at a time. 😅
I guess the first long message didn't show. Building a 60' wall 8' tall with 10' foot forms. How do I join courses vertically. How long to dry before next course. Thanks again
Wall is straight garden wall
2' wide also😅
Do you mean, how to integrate the 10 foot long panels together side by side?
Hi there. I think we will be able to get 60' long by 2' tall done per day now. So no need for question. Thanks again 🙏💙🌍.
What do you do if it rains
Just cover the walls with some tarps or plastic. If the raw walls get rained on, it's honestly not even going to hurt them though. It might just cause some surface aesthetic damage.