... backer board made of XPS board+cement&fiberglass mesh, for wetrooms, floor ... , steps and water pipes.Specifications: MaterialFiberglass mesh&cement+XPS board+ Fiberglass mesh&cementFunctionWaterproof and insulatingJIT tile backer board ... all substrates, exterior and interior3.Using top-quality XPS boards as the core, JIT tile backer boards ... x 600mm to 2600mm x 1200mm. Waterproof XPS sandwich panel