Multi-layer insulating wall block based on hemp shives and magnesium binder

Description: Multi-layer non-load-bearing insulation block, 240×400×600 mm, made of hemp shives and magnesium binder. Heavier outer layers stiffen and protect the block, while the lightweight middle layer insulates. A phase change material and fibre orientation reduce heat transfer and improve heat storage.

This invention is a multi-layer wall insulation block made from hemp shives and a magnesium binder. The block measures 240 × 400 × 600 mm, with a 400 mm wall thickness enabling compliance with the external wall heat transfer requirement of 0.2 W/(m²K). It consists of three layers: two outer/inner layers, 50–60 mm thick and about 400 kg/m³ in density, which stiffen and protect the block, and a middle insulating layer about 290 mm thick and 220 kg/m³ in density. The inner layer (60 mm) includes a phase change material that improves heat storage capacity. Compared with lime binders, the magnesium binder, based on magnesium oxide and magnesium salt, provides sufficient strength and stiffness at a relatively low content. During compaction, hemp shives align perpendicular to the compaction direction and, in the wall, perpendicular to heat flow, helping reduce thermal conductivity. The blocks are laid with mortar, such as perlite- or hemp-shive-based thermal insulation mortar. They are intended for non-load-bearing insulation applications, for example in timber frame structures.

Organisation: Lublin University of Technology

Innovator(s): Przemysław Brzyski, Tomasz Bujnowski, Piotr Łapka, Łukasz Cieślikiewicz

Category: Nanotechnology, Materials & Engineering

Country: Poland