## 1 Introduction  
In the modern building industry, applications of composite materials based on fibre-reinforced resins are gaining scale. As a result of chemical resistance, low heat conductivity, good strength parameters and low production costs, composites are competing with traditional building materials, such as steel and aluminium. Reinforcement bars produced on the basis of epoxy resins and strengthened with basalt fibre or thermal consoles to fix aluminium facade constructions made from epoxy composites strengthened with glass fibre are just examples of such applications. For that purpose, ceramic-metal composites have been designed and fabricated; as they show low thermal conductivity and high strength [1], they were thus applied for the construction of novel kinds of fasteners. Importantly, they revealed better structure service reliability compared to traditional fasteners [2; 3; 4]. Another interesting application of composite materials in load-bearing building constructions is epoxy connectors for prefabricated reinforced concrete wall panels connecting reinforced elevation layers separated by a thermal insulation layer with reinforced panel construction layers. The requirement to reduce heat losses is met through insulating building walls with thicker and thicker thermal insulation layers. Traditional fasteners and consoles made of steel and aluminium pierce the thermal insulation layers and cause intensive thermal bridges. Such thermal bridges may lead to substantial energy losses in the building heating/cooling management. Thus, modern solutions to walls with cladding penetrating the thermal insulation layers seek technologies reducing the energy losses in buildings. One of such solutions may be application of vinylester and epoxy resins reinforced with basalt textile in the production of anchors dedicated to fixing ventilated facades of buildings since the resins are characterised by incomparably lower heat conductivity than metal anchorage. For example, vinylester resins have coefficients of heat conductivity \(\lambda\) of up to 0.3 W/mK [5], whereas aluminium is around 200 W/mK [6]. Basalt is a natural material from volcanic rocks and, as a powder, is mainly used in construction or high-way engineering. Basalt, after melting at 1300-1700 \({}^{\circ}\)C, could be spun into fibres. It can be used as an efficient reinforcement for polymers in the form of powder, fibres, textiles, and wool [7; 8; 9; 10; 11]. Thanks to its thermal and sound insulating properties it has been applied in different technical applications, e.g., in automotive, construction and building sectors. The wide range of possible applications results from its advantageous properties. Automobile, aircraft, ship and household appliances are also made with thermosetting resins reinforced with basalt fibres. Possible techniques involve direct pressure autoclaving, laying out, prepregs fabrication, vacuum moulding and winding [12; 13; 14]. In the building industry, application of materials of low heat conductivity, such as vinylester and epoxy resins, allows substantial reduction in point thermal bridges in ventilated facades or could even eliminate them completely. However, the basic criterion relevant for the material selection for external wall cladding is strength parameters. The anchors of external wall cladding are subject to tensile, compressive and bending stresses under a variety of climate conditions. In the Central European climate, outer walls may face thermal stresses in the temperature range from \(-25\) to 80 \({}^{\circ}\)C [15]. This article presents results of investigations on the strength of vinylester and epoxy resins reinforced with basalt textile for the production of insulation construction fasteners as an alternative solution to traditional cladding anchorage of stone external walls. Heavy stone cladding requires an exceptionally dense system of anchors given the necessity of their individual fixing (Figure 1).