Hempcrete is a building product that ticks all the boxes and at Sowden Building Solutions. It is our choice for building material as it is an extremely sustainable way of building, creating a breathable wall system which is monolithic in structure. 


It has excellent thermal and acoustic properties, is termite and fire resistant and controls the humidity in your home preventing damp and mould – thus improving air quality.


It also has high insulation value and has some thermal mass which is fantastic during winter as it will hold some heat in the walls so that you are not continuously heating the air as you would in a highly insulated lightweight structure. As it is of a monolithic form it is reasonable air tight – again meaning that you don’t need to heat air as much as there are not as many air changes as there are in a ‘normal’ build.


The acoustic performance is exceptional when ceiling and walls are done - perfect for jobs in Sydney’s Inner West which are under a flight path - the performance will exceed the requirements needed.  


For each cubic meter of Hempcrete placed it will sequestrate 108kg’s of carbon – making it unlike most building products.


Industrial hemp is grown locally in Australia which is fantastic for the farmers. Hemp is used as a rotational crop and grows to about 4m in 3 months. It doesn't need any fertilisers or pesticides and very little water. Whilst growing it will take pesticides out of the soil and store in its roots. It also re-fertilises the soil as the plants are fighting each other for sunlight they drop their leaves which compost on the ground. Unlike what most people think of hemp as bushy plants, industrial hemp is planted with about 100 plants per square meter, so there is basically only stems with leaves at the top canopy.


Industrial hemp is highly regulated by the authorities with plants only allowed with a THC level of 0.5%. Cannabis is around 20%.