Experimental Study on Bond Strength of External Insulation System with Glazed Foamed Ceramic Insulation Board

External wall insulation composite systems (ETICS) play a crucial role in enhancing building energy efficiency, with glazed foam ceramic insulation boards (GFCIBs) emerging as a particularly promising material. Despite their growing application, there remains a notable research gap regarding the mechanical performance of ETICS incorporating GFCIBs. This study comprehensively investigates the mechanical characteristics of ETICS through a series of standardized tests, including compression, three-point bending, uniaxial tensile, Brazilian disk, single shear, and oblique shear analyses. The experimental results demonstrate that GFCIBs exhibit exceptional mechanical properties, with a tensile strength of 1.26 MPa, compressive strength of 10.4 MPa, bond tensile strength of 0.85 MPa, bond shear strength of 0.23 MPa, tensile modulus of elasticity of 4.4 MPa, and compressive modulus of elasticity of 628.6 MPa. Further, the material displays significant dual-modulus characteristics. The study also presents a modified formula for calculating tensile and compressive strength in three-point bending tests, with preliminary validation of its feasibility. These findings not only provide essential experimental data for ETICS design and material selection but also offer novel methodological insights for evaluating the bond strength of similar composite materials.