Fire Resistance Evaluation of Pressed Straw Building Envelopes

Written by esba

Ecological construction has a tendency to increase. One of its directions is the straw bale-house. The safety of such buildings is based on increasing the fire resistance of pressed straw panels. In order to increase the fire resistance of such panels, they are plastered with a clay-lime mixture, treated with flame retardants and antipyrenes. The protective equipment effect on the fire resistance is not fully understood. Therefore, the work considers evaluation issues of the fire resistance in pressed straw building envelopes, depending on the plaster layer thickness, the straw pressing density and the flame retardants treatment. The study found that with a panel thickness of 450mm, the straw density in the range of 110-140 kg/m³, clay plaster thickness of 30mm ensure integrity, insulating and load-carrying capacity. The temperature on the panel rear side did not exceed 67°C. The pressed straw density has almost no effect on the panel fire resistance. Antipyrenes treatment improves flammability from 18% to 37-42% that makes it possible to classify the samples as hardly combustible materials.

Authors: Ovsyannikov, Sergey I; Dyachenko, Vladislav Yurevich, Dec 2019


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The European Straw Building Association is an independent European association, devoid of any profit making motive. The object of the Association is to promote and develop the use of straw, as a sustainable way of building in all the senses of the term “sustainable”: renewable, ecological, healthy, energy and climate efficient, social and economic.
The Association is a federation composed of organisations and people particularly concerned with the use of straw in buildings.