Hempcrete in Cold Climate

How Does Hempcrete Handle in Cold Climate?


Climate change is a serious threat to our world. The rising emissions of greenhouse gases are increasing the average temperature of our planet. Eco-friendly building materials like hempcrete are growing in popularity to fight this temperature change. Not only naturally derived, this hemp lime mixture plays an essential role in controlling the temperature during all types of weather conditions. For the purpose of this article, the focus will be on hemp insulation during cold weather.


The Insulating Nature of Hemp

Hempcrete is a hemp-lime insulating material that can act as a protective covering for your house. The U-value and R-value of hemp lime make it an ideal material to be used for construction. 

The U-value of a material determines how much heat can pass through a material. The lower the U-value, the better for insulation. Depending on wall thickness (and other variables), hempcrete’s U-Value can range from 0.16 to 0.52 W/m²K. Meaning, walls built with hemp lime are some of the best insulating walls a home can have. 

The higher the R-value, the more a material resists heat flow. Hempcrete has an R-Value of 2.4/inch based on 4:1:1 mix combo, making it more resistant to heat flow. Thus, during cold weather, in-floor heating of hemp lime can provide efficient warming to the house.  


Moisture Regulation Property

Another feature of hemp insulation that makes it suitable to be used in cold weather is its moisture-regulating property.  This property allows it to absorb excessive moisture from the air and release it when the conditions allow. 

Being a porous and breathable material, it can regulate excessive moisture

It has been estimated that a 35 cubic ft (1 cubic meter) of hemp lime wall can absorb and lock 242 – 364 lbs (110 – 165 kg) of carbon. As a result, buildings constructed with hemp will absorb the carbon from the atmosphere and lock it away, giving durability to the building.


A Non-Toxic Material

Natural materials like hemp lime are mild, eco-friendly and do not pose any threat to the health of those working with the material (you don’t see construction workers wearing hazmat suits while working with it). The hemp plant does not require pesticides, herbicides or chemical fertilizers to grow, thus resulting in less damage to the environment. Furthermore, once placed in the walls and fully dried, it does not release any toxins.