How to make a hempcrete wall
Four parts hemp hurd, one part lime binder, and one part water is all you need to make hempcrete, a durable building material similar to pressboard or adobe. Just fill up the form with hempcrete, tamp it down, and once it’s set, you’re set!
Ben Christensen of Oregon Hemp Works and Joy Beckerman of Hemp Ace International explain:
Get 15 great people there from you community, you empower them on how to build their own home, much like the Amish barn raising, and you get your building done in a day depending on how big it is. Mix, cast, and tamp. At the end of your hempcrete home’s life, that structure’s life, you can actually take the hempcrete home apart, crack that hempcrete up, and put it into your next hempcrete mix and/or you can use it as some type of a soil amendment. We’re talking about reusable, recyclable, and durable. It just doesn’t get any better than that.
FYI, hemp hurd looks more smokeable than the crappy weed we had in middle school.
- 9 COMMENTS
- green rush
Willy Wonka dialogue as a sax and drum jazz duet
David Dockery performed a drum solo of the climactic scene in Willy Wonka & the Chocolate Factory. Then Dan Felix upped the game with a saxophone accompaniment to the original. READ THE REST
This portable USB charger can get an Apple Watch back to full power on the go
The Apple Watch is a great addition to any tech arsenal–until it runs out of juice, that is. Then, you have to go about the process of recharging. Of course, the Apple Watch only recharges via wireless charging, meaning it can sometimes end up being pretty inconvenient to power up, especially if you’re out and… READ THE REST
28 essential items you’ll need to survive this winter
We’ve probably all been holding our breath about this for a while. And now that it’s here, we can start getting used to the idea that this winter will be unlike any before it. With COVID’s impact on the holidays, we’re all expecting some big changes this time around. However, Mother Nature isn’t really all… READ THE REST
These Kodak scanners, printers, and projectors are the perfect holiday gift and already on sale
This year has given us a perfect opportunity to work on a holiday season project. Since virtually every family has loads of history trapped in old slides, negatives, and photos, this might be just the right time to make sure those precious and historic moments are digitized and preserved for eternity. That used to mean… READ THE REST
Read the rules you agree to by using this website in our Terms of Service.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Who will be eaten first? Our forum rules are detailed in the Community Guidelines.
Boing Boing is published under a Creative Commons license except where otherwise noted.
https://www.youtube.com/watch?v=Att0370kH-s Four parts hemp hurd, one part lime binder, and one part water is all you need to make hempcrete, a durable building material similar to pressboard or adobe. Just fill up the form with hempcrete, tamp it down, and once it's set, you're set! Ben Christensen of Oregon Hemp Works and Joy Beckerman of…
How to make small scale hempcrete? Answered
It is supposed to be just made of lime, shredded hemp stalk (which you can replace with straw if not available) and water. There is also briefly mentioned a lime heating process, but nothing more detailed than that.
I’m not into making a house with this, but I would be interested in making things like plant pots, small tables and stools, and various artwork with it.
I need more info though. Like.
Is there a specific kind, or prepared lime I need to use?
What is this heating process you need to do to it?
What parts lime to hemp/straw is recommended?
How long is the curing process?
It seems like you could make some neat things out of this, but I haven’t found anyone doing so. Are there any experts that could offer advice about this kind of thing?
There are several variations of this mix possible, as Kiteman pointed out using ready to go concrete is the easiest way.
But in other areas of the worls just water is used, when it freezes the added fibres even make the stuff shatter and bullet proof.
A friend of my in Europe had experimented with alterative building materials for many years, so I will try to list what I still remember from his work:
You can use all sorts of “filling material” from dried grass, over long straw to tyres and polysterene foam bubbles.
Polystyrene makes a very light weight concrete with uperior insulation properties.
Compared to a normal block of concrete you can save up to 40% weight.
Instead of concrete old mixtures based on hydrated lime, clay or even mud can be used, he experimented at one stage even with resin from pine trees as a binding material.
The key to success is preperation, the ingredients must be dry (no moist plant material) and fibres should not be longer than 15cm unless you are using moulds where you can compress the concrete properly before it sets.
If the fibres are too long you will have the problem that they lump together causing a mix concrete with a massive ball of (censored) floating in it.
Modern technology is really good and a concrete mixer would be the obvious choice for the mixing job, but my friend actually prefers a big tarp on the ground plus a concrete mixer.
Concrete and sand (or clay, mud) are prepared in the mixer, the filling material is spread over the tarp.
Add the ready concrete ( a bit wetter than what you would normally use for making concrete jobs) and spread it over the filling material.
Now you work the mix with 2 or more people by lifting the tarp on the sides and edges, literally rolling the mix from one place to the other.
The mix is ready when it is evenly mixed and the concrete gets back to a normal consistency – at this stage the plant material has partially absorbed the water from the concrete causing a really good bond after curing.
You can check the quality of the mix by breaking it with a hammer, it should not seperate around the fibres but with them.
Key for outdoor use is to make it waterproof, so the foundations should be normal standard concrete and the outside surfaces should be painted or covered with some rendering material.
If the natural look should be kept get waterproofing additives to mix directly into the concrete and seal the outside with lisnseed oil or similar – be aware that natural coatings need to be re-applied every few years or when there is the need for it, like on the weather side of a wall.
I was watching this video about hempcrete. https://www.youtube.com/watch?v=il7yw0JFs5c It is supposed to be just made of lime, shredded hemp stalk (which you can replace with straw if not available) and water. There is also briefly mentioned a …