Using Hemp To Sustainably Build With Hempcrete

Hempcrete, one of the world’s oldest and most eco-friendly construction materials, is experiencing a renaissance. As a result of the recent passage of legislation in a number of states that decriminalizes cannabis for both recreational and commercial use, there is an enormous untapped market for hemp as a construction material.

What exactly is hempcrete?

It is a biocomposite consisting of hemp’s woody center, a lime binder, and water; other names for this material are hemp concrete and hemp lime. Because it has a high percentage of silica, the hemp core, also known as hemp hurd or shiv, is able to tightly bond with the lime.

What you end up with is a cementitious material that is six to eight times lighter than concrete but yet has excellent insulating characteristics.

Hempcrete Infill Panels

When renovating antique or historic structures, hemp concrete is utilized to insulate walls and repair wood frame infill panels. Due to its vapor-permeability and its ability to be molded into irregularly shaped areas on the wall without drooping, it is suggested for use in historic structures.

Be careful to distribute the hempcrete evenly around the shuttering as much as possible until it is completely filled. In order to make the subsequent lift, if necessary, build more stuttering while taking care not to harm the lift that came before it.

Casting the lintel in one go and extending it at least a foot out from either side of the wall is the best way to improve the structural strength of the wood spanning section when it is being done while casting over doors and windows. To provide appropriate support while the hempcrete cures, cast hempcrete into the lintels on each side of the frame for minor wood spans like roof battens. More wood is needed to provide the necessary support for a longer span, so plan accordingly.

At wall apertures like windows, cast hempcrete one inch higher than intended. When you are completed, you will need to trim it back using a hand saw in order to build a structure that is smooth and sturdy.

How to Install Electrical Wiring in Walls Made of Hempcrete

Before the hempcrete walls are poured, your electrical system needs to be placed inside the walls using hempcrete. Click here to read more about hempcrete. Because of this, you won’t have to bolt any boxes or conduit to the walls’ surfaces anymore.

To securely fasten your conduit and electrical boxes in the hempcrete form, carefully follow the specifications on your drawings. You won’t need to remove wires or pass inspections afterwards.

In order to run wires and outlets through the hempcrete walls, you must first carefully plot out their placement and the routes they will take using your designs as a guide. An electrical professional can assist you in determining whether or not the components meet the requirements of the local building regulations in your region.

After the hempcrete has had time to harden and form, you should have a qualified individual draw the wires in through electrical conduits, install the outlets, relays, junctions, and some other electrical connections in the electrical boxes, and then finish off the job by painting the hempcrete.

To guarantee that your electrical system complies with requirements, request an examination last.

How to Construct a Roof Using Hempcrete

Hempcrete may be used to provide insulation for flat concrete roofs ( As a result of hempcrete’s low weight, the application process is brisk and uncomplicated. Hempcrete is used for roofing by first pouring a screed over the surface, and then sealing it to prevent damage and maintain its integrity.

This onsite repair will prevent your building from becoming too hot during the summer and give your flat roof its best chance at lasting for years to come.

The Use of Hempcrete in the Insulation of the Floor

If you use hempcrete for your floor, not only will it insulate the slab, but it will also provide sufficient support for the whole home. It is important that the hempcrete be completely dry before applying the floor finish so that it may be done so efficiently. Even more advantageous is the fact that this form of insulation may be coupled with a wide variety of screeds, including cement, lime, and clay.

You can construct hempcrete insulated floors quickly, they have exceptional compressive strength, and they provide a high level of technological flexibility, such as the ability to insert ducts into the screed or add underfloor heating.

How much does it cost to buy hempcrete?

Everything from the plumbing to the accessories is included in the price of a hempcrete home, which ranges from around $100 to $200 per square foot. On the other hand, the quantity will be heavily influenced by the ease with which you can get hempcrete in your region. It is anticipated that the price of constructing a house out of hempcrete would decrease if the production of hemp is made legal.

How Much Weight Does Hempcrete Have?

The weight of conventional concrete is reduced by a factor of six to eight when using hempcrete. Because of this, hemp concrete is extremely simple to carry and work with, which helps keep construction costs down and reduces the likelihood of damage. Go to thehempcollect to read more about the innovative products made of hemp.

In addition, because of its low density, the use of hempcrete in the renovation of older buildings does not result in an overloading of the structures.

What Kind of Strength Does Hempcrete Have?

In general, the density of hempcrete falls anywhere between 40 and 55 kilograms per cubic meter. Hempcrete’s mechanical strength may be improved by increasing the binder content to a greater percentage. This will allow the density to be increased to a maximum of 2,200 pounds per cubic meter.