Hempcrete: An Eco-friendly Building Material
Hempcrete, a biocomposite material made from the inner woody core of the hemp plant mixed with a lime-based binder, is gaining popularity as a sustainable building material. Unlike traditional concrete, hempcrete is not used for structural support; rather, it acts as a highly efficient insulator and moisture regulator within buildings.
The production of hempcrete requires relatively low-energy compared to conventional building materials, as it does not require the intense heat or energy input needed to produce Portland cement.
Benefits of Using Hempcrete
One of the most compelling reasons to use hempcrete is its environmental impact. Hemp is a rapidly growing plant that can be harvested in just a few months, making it a renewable resource. Additionally, the production of hempcrete captures more carbon dioxide than it emits, which helps reduce the overall carbon footprint of construction projects. Research by the "International Hemp Building Association (IHBA)" states that hempcrete can capture up to 110 kg of CO2 per cubic meter, making it a carbon-negative material when factoring in the carbon stored during the growth of the hemp plant.
Hempcrete offers excellent thermal insulation properties, which can significantly reduce energy costs in buildings. It has a high thermal mass, meaning it can absorb and store heat, releasing it slowly over time. This ability helps maintain a stable indoor temperature, reducing the need for heating and cooling systems. Additionally, hempcrete's porous structure provides effective sound insulation, making it an ideal material for noise-sensitive environments.
Potential Use of Hempcrete
Hempcrete is a versatile material which can be used for various construction applications.
Walls
It is most commonly used to make walls in new builds, serving as both the wall and insulation in one piece. This is in contrast to traditional insulation materials which are installed in a cavity within the wall
Floor ceiling and roof insulation
In addition to walls, hempcrete can also be used for floor, ceiling, and roof insulation. Unlike conventional insulation materials, hempcrete combines with a structural frame, typically untreated softwood, and is finished with lime or clay plaster inside and lime render outside.
Retrofitting older buildings
Hempcrete is also ideal for retrofitting older buildings. It is commonly used to upgrade the thermal performance of historic buildings, and is perfect for traditional construction thanks to its ability to adapt to uneven surfaces and provide vapour permeability.
As the construction industry continues its quest for sustainable materials, hempcrete emerges as a standout option. Its carbon-sequestering capabilities, natural temperature and humidity regulation, and renewable origins make it an ideal choice for eco-conscious builders.
Although there are challenges to address, the increasing interest and investment in hempcrete technology signal its potential to play a key role in the future of sustainable construction.