The development of plant-based materials will help to solve the problems associated with the use of agricultural waste, and at the same time to get inexpensive and effective insulation materials based on environmentally friendly local raw materials. The advantages of such materials are availability, fast recovery, low cost, environmental friendliness and low thermal conductivity. In the work with the use of flax straw at a consumption of Portland cement of 150 kg per 1 m3 of concrete, thermal insulation lightweight concrete with an average density of 350 kg/m3 and a strength of 0.53 MPa was obtained. The article presents the results of research of temperature changes on the surface of external enclosing structures using the developed thermal insulation concrete based on flax straw in combination with a solar energy absorber. It is established that such a structure of an external wall provides thermal inertia of a protection within 7-7.5 hours.
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