In this series of technical reports on natural insulators, we will introduce concepts related to the thermal behavior of the different isolations. With it, we can know the capacity of the material to let out the internal heat. The higher the thermal conductivity, the more heat we will lose. For example, the known rock wool insulation has a thermal conductivity very similar to that of hemp, precisely between 0.034 and 0.041 W / m * K.
The acoustic absorption capacity of hemp is very high (0.7 out of 1), thanks to its density and porosity. What is achieved by absorption is to transform a large part of the sound energy that passes through it? If it reflected, the sound would stay in the
Stay, as it happens with thermal insulating materials of closed pore synthesis, such as expanded or extruded polystyrene, or polyurethane, being its acoustic result inferior, due to the null acoustic absorption of these materials.
The sound energy penetrates the article only to a certain depth, from which it would not be necessary to provide further thickness, but if the thickness is not adequate, absorption possibilities will be lost. Depending on the use of the space we can estimate the sound that will be produced in it, so we will choose the thickness of the hemp material to achieve the desired acoustic absorption.
Commercial Materials Based On Hemp Fibers
From the hemp fibers, numerous and varied products destined to the construction are obtained. The most common outcome is hemp blankets, from which we can find a large number of companies both distributors and producers of their material. But there are also other hemp-based building materials such as lime and hemp insulating mortars, bulk hemp wool or rigid insulating boards among others. For the description of the latter, we have based ourselves on the products of the Cannabric Company. Here you have a story about them, and for more information, you can consult their catalog.