Eryap Group and Trade Inc. producing Polymer Siding with the AMERICAN SIDING Brand, XPS extruded polystyrene thermal insulation boards with the BONUS XPS brand, bitumen based water insulation membrane with the BONUS Membrane brand, PVC Window and Door Systems with the WINER brand, stone wool heat, fire and sound insulation boards with the BONUS Stone Wool brand. Eryap Group works on production of siding systems, heat, water, sound and fire insulation materials and polymer door – window systems in its 3 production facilities exceeding a total of 150.000 m2 area, since 2001. Eryap Group provides services with its extensive distributor network in 81 provinces of Turkey; and exports its products to overseas with the strong partnerships it created in more than 25 countries.