Building With #Hempcrete 101

Hempcrete is used as a highly insulative wall material. It is a carbon-negative, natural, and lightweight construction material that provides highly efficient temperature and moisture control. It is also formable, dynamic, one-seventh the weight of concrete, and cures within hours.

Author: William Brain // Last updated on September 5, 2023 4 Comments

Excerpt: "What Is in Hempcrete and Can I Source It Myself?

Hempcrete has three constituent parts: hemp, lime, and water.

Hemp, and Where to Source It

Here in #Australia, #HempShiv is only beginning to be farmed and brought to market. (A couple of notable enterprises being Hemp Homes Australia and X-Hemp in Tasmania where 80% of the hemp in Australia is currently farmed).

In Europe, a large industry is established and growing, with processing facilities in France, Holland, and Germany. The last house I built — working in Scotland — was made with Lithuanian hemp.

Over in the US, hemp production has exploded since the Agriculture Improvement Act or Farm Bill of 2018, finally allowing hemp cultivation after many, many years. [Alas, that is been severely curtailed. So much for Hemp For Victory]

The Binder

As you might assume, the binder is what binds the hemp shiv into a solid mass. The binder consists of either hydrated lime or natural #HydraulicLime. #HydratedLime (or air lime) has no impurities and is made by #kiln-firing limestone. The firing process removes the carbon molecules from the limestone and converts it into a dry powder. When you want to use lime as a binder or mortar, you introduce carbon dioxide again, essentially converting the lime back into limestone as it absorbs surrounding CO2. This is what’s known as the carbon cycle.

The other lime, hydraulic lime, is also kiln-fired using the same process. The difference being hydraulic lime has added or existing impurities known as #pozzolans."

Read more:
https://insteading.com/blog/building-with-hempcrete/

#SolarPunkSunday #DIY #Hemp #BuildingWithHemp #HempIsTheFuture

How to Make a #HempcreteBlock

Hemp In A Pot, Oct 4, 2022

"Putting together a small block of #hempcrete, also known as #hemplime, a lightweight insulating material that has a ton of benefits when compared with other insulating materials on the market today, and is also carbon negative, which can help with #ClimateChange.

The process involves mixing hemp hurds, hydrated lime, and water, then pouring the mixture into a mold to dry."

Watch:
https://www.youtube.com/watch?v=aB07P3yrQY8

Hempcrete kit:
https://www.hemptraders.com/SPC-p/spc.htm

#SolarPunkSunday #DIY
#Hemp #BuildingWithHemp #HempIsTheFuture

#Hempcrete sprayed with clay binder!

#Hempknowlogy, May 9, 2023

"Brief overview of the hempcrete clay spray system from #EcoPertica, an innovator in clay spray techniques. This is a cobbled together system that uses the three nozzle, nozzle from #Euromair, an Imer plaster/render pump and an insulation blower. Blowing dry hurd in the center and that hurd is wetted with clay by the exterior nozzles."

Watch:
https://www.youtube.com/watch?v=Ne5ii975Mo4

#SolarPunkSunday #Hemp #BuildingWithHemp #HempIsTheFuture

How to spray #hempcrete?
Spraying Machine Demo

Jul 6, 2017

"Demo spraying hempcrete in England with #Euromair system

https://www.youtube.com/watch?v=fCsdLQcB8Pw

#SolarPunkSunday #Hemp #BuildingWithHemp #HempIsTheFuture

So, the cost for #Euromair #Hempcrete Spraying Lances and equipment is $45,000 in 2026. Yikes! And the training isn't cheap either ($2,500, which is how I found out about it -- through #Limeworks -- a place that sells traditional mortar). But hopefully, the price will come down as the technology becomes more ubiquitous?

Automated Hempcrete Install using customized EuroMair® Projection System for Professionals

2 Days – 8:00 am to 3:00 pm
$2,500

"Hempcrete is a sustainable, mold-resistant, rot-resistant, pest-resistant, fire-resistant, carbon-sequestering building material that provides optimal indoor air quality and energy efficiency. It’s an ideal infill for additions, remodels, retrofits, and new construction. This hands-on workshop introduces the basic principles and work practices needed to build with industrial hemp. The lecture, demonstrations, and hands-on exercises cover the benefits of hempcrete as a building material, proper mixing techniques, installing a hempcrete wall, and various functional and decorative finishes to coat hempcrete structures.

"Under the guidance of experienced masons from the LimeWorks.us Technical Install Team, participants will also have the opportunity to practice both using the EuroMair® Projection System to spray hempcrete and building hempcrete walls using chopped hemp hurd (the woody core of the hemp plant) mixed with lime binders provided by LimeWorks.us. Prior masonry experience is helpful but not required. The class is designed only for people who want to buy the EuroMair® Projection System from LimeWorks.us, The Exclusive North American Distributor of EuroMair®."

What can EuroMair do?

" - EuroMair® Projection System can be used stand alone for blowing hemp hurd, cellulose, mineral wool, (and perlite insulation for masonry cavities).

- EuroMair® Projection System can be used stand alone to spray hempcrete between stud cavities and in front of framing studs in one pass.

- EuroMair® Projection System can be used stand alone to spray stuccos, lime renders, milk of lime stabilizers, plasters with or without hemp hurd added for insulating plaster.

- EuroMair® Projection System can be used stand alone to pump point Ecologic™ Mortar for brick or stone, Ecologic™ Injection/Stabilization Grouts"

https://www.hempbuildmag.com/events/scykk2i89jidcq4wp6bqc1mfkswpj6

#SolarPunkSunday #Hemp #BuildingWithHemp #HempIsTheFuture

#Hempcrete Walls: a Homeowner's and Pro's Guide

All about hempcrete - a carbon-negative and highly efficient building material for sustainable construction and renovation projects.

Ecohome Updated: Aug. 25, 2025
Mike Reynolds

"In this comprehensive guide, we'll break down everything you need to know about hempcrete including what it is, how it works, and why it might be the perfect choice for your next project. We'll cover everything from its unique properties and practical applications to its cost and challenges, providing you with the objective, evidence-based information you need to make an informed decision for your home and the planet.

This guide provides a comprehensive look at the key aspects of this topic. Below is an overview of the sections we will cover, allowing you to jump directly to the information you need."

Learn more:
https://www.ecohome.net/en/guides/4101/hempcrete/

#SolarPunkSunday #DIY
#Hemp #BuildingWithHemp #HempIsTheFuture

The buildings constructed from #cannabis

Francesca Perry, 18 June 2023

Excerpt: "In search of #sustainable materials, architects are turning to an unusual source: #hemp.

"Surrounded by verdant fields, Flat House, which sits on a farm in Cambridgeshire, the UK, looks like a typical barn conversion. But inside, the look and feel of the building immediately make you realise this is something quite different. 'The walls remind me of hay bale dens we used to make as kids,' says Flat House's owner Gemma Barron. 'It has the most lovely acoustic quality. And last year we had the heating off for 24 hours in mid-winter and it stayed warm.'

"What makes this bright, airy and comfortable home unusual is the material used to build it: hemp. While we may be more familiar with the cannabis plant's association with the psychoactive substance cannabis, and its use in health supplements and textiles, hemp is rapidly becoming a sought-after sustainable construction material.

"The fast-growing plant is a renewable resource, with carbon-capturing properties. When used in building, it typically takes the form of 'hempcrete' (also known as lime hemp concrete), a sturdy material made by mixing #HempHurd – the woody core of the plant – with a binder made from water and lime. Hempcrete has a high thermal mass, making it an ideal insulation material which improves the energy efficiency of buildings and reduces greenhouse gas emissions over time. It also continues to absorb carbon over its lifespan.

"Sustainable materials are in high demand as the construction industry seeks to decarbonise. Buildings and construction are responsible for approximately 37% of energy and process-related global carbon dioxide (CO2) emissions. This is due to the industry's heavy reliance on fossil fuels, including carbon-intensive materials such as concrete, steel and glass, as well as the greenhouse gases emitted in heating and cooling our buildings."

Read more:
https://www.bbc.com/future/article/20230614-the-buildings-constructed-from-cannabis

#SolarPunkSunday #BuildingWithHemp
#HempFiberboard #Hempcrete #HempIsTheFuture #HempBan #BuildingForClimateChange #SustainableMaterials #SustainableBuilding

This guide covers a lot more than other one I posted...

How to Make #Hempcrete: A Step-by-Step Guide for Beginners

What You’ll Learn

- The Essential Steps to Making Hempcrete at Home or On-Site

- Step-by-Step Guide: How to Make Hempcrete

- In Focus: Hempcrete Mix Ratio: Lessons Learned from the Field

- How Does Lime Type Affect Strength in Hempcrete?

- Tools That Extend the Life of Your Hempcrete Projects

- What Could Go Wrong? The Drawbacks of Building with Hempcrete

- What Are Hempcrete's Limitations in Construction?

- Can Hempcrete Work in Extreme Climates?

- Can Hempcrete Replace Traditional Building Materials?

- What Are the Risks of Hempcrete?

- What Makes Hempcrete Stand Out? Exploring Its Key Benefits

Learn more:
https://www.architecturecourses.org/sustainability/how-make-hempcrete

#SolarPunkSunday #BuildingWithHemp #Hempcrete #HempIsTheFuture #HempBan

How to Make #Hempcrete

Written By Carmen, February 25, 2024

"Have you ever considered constructing your own sustainable home? Hempcrete is one of the most cutting-edge building materials on the market, offering an efficient and eco-friendly way to create a structurally sound space."

Tools and Materials You Will Need to Make Hempcrete

1. Hemp hurd (the inner woody core of the hemp plant)
2. Lime-based binder
3. Water
4. Mixing container
5. Gloves and protective gear
6. Mold or formwork
7. Tamping tool
8. Wooden planks or boards for smoothing

Learn more:
https://constructli.com/how-to-make-hempcrete/

#SolarPunkSunday #DIY #Hemp #BuildingWithHemp #HempIsTheFuture #HempBan