Informal group

”Association for building with natural materials”

Part of Association „Green School Village”

The Green School Village Association (GSV) is nongovernmental, nonprofit organization, which promotes life near and in harmony with nature, and works for the study of natural and cultural heritage in Bulgaria. The association supports mainly projects which are implemented primarily in rural areas and are associated with creating new opportunities for their development. The main developing directions are related to the preservation of indigenous cultural heritage, traditional building with natural materials and permaculture.

The direction works with natural materials and design biodynamic develop activities in the development of building with natural materials and the Bulgarian architectural heritage since 2006.

In 2010 the Association “Green School Village” was funded under the EEA for establishing the study of the Bulgarian civil legislation and creating a concept for the legalization of natural materials in Bulgaria. Within this project was given greater attention to building with straw bales, in addition to the study of international experience had made ​​real steps for a Bulgarian Technical Approval (BTA) for construction of straw to the Association. Within the development of this concept were conducted following laboratory tests:

– Bulk density at different moisture (current state, after drying naturally, in air-dry environment) (ρ kg/mᶾ);

- Hygroscopicity;

- Kinetics of drying in air-dry environment, determining the equilibrium moisture;

- Dimensional stability under various temperature-humidity regimes;

- Behavior under load of pressure;

- Determination of thermal conductivity (λ W/ (m.K));

- Calculation of vapor permeability µ;

- Development of mold fungi and others microorganisms;

- Strategy to limit their formation and growth;

- Durability (cohesion) of the outer coating: adhesion between layers (C kPa);

- Determining the structure and grainy composition of soil (clay) recommended for use for different layers of plaster;

- Behavior under cyclic wetting drying behavior under cyclic freeze – defreeze, capillary water absorbency and others;

- Calculation of the coefficient of thermal conductivity;

- Evaluation of its insulation capability of airborne noise (R);

In the development of activities related to sustainable building, many specialists and experst are involved, besides  Green School Village members. The circle of experts includes academics (lecturers), architects, microbiologists from the Ministry of Helath Care (Department of Health) and NGO members (employees). Thus a non formal group – Association for Natural Building was established which aims to  develop theoretical and practical activities in the field of bioclimate designing, building with natural materials, in particular building with straw bales.  This group is gathering members from different NGOs, national authorities and academies with active development of this priority topic: Green School Village, Bulgarian section of International Solar Energy Society (BgISES), Bulgarian Academy of Science.


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