Which has better thermal insulation performance: extruded polystyrene board or rock wool board?

Extruded polystyrene board and rock wool board each have their own advantages in terms of thermal insulation performance, and the specific choice depends on the application scenario and requirements.

Thermal insulation performance of rock wool boards

Rock wool boards are renowned for their low thermal conductivity, high water repellency, and excellent thermal stability, effectively maintaining stable indoor temperatures. They also offer superior fire resistance, with a fire rating of Class A, are non-combustible, and do not release toxic substances, making them suitable for high-rise buildings and public spaces. The thermal insulation performance of rock wool boards is primarily achieved through their porous structure, which effectively reduces heat transfer, making them ideal for applications requiring both thermal insulation and fire resistance. Additionally, rock wool boards offer significant sound absorption and noise reduction effects, as well as excellent water-repellent properties, maintaining good thermal insulation performance even in humid environments.

Thermal Insulation Performance of Extruded Polystyrene Boards

Extruded polystyrene boards are made from polystyrene through an extrusion process, forming a dense honeycomb structure. They feature high thermal resistance and low linear expansion rates, effectively preventing thermal bridges, making them suitable for cold regions and buildings with high thermal insulation requirements. Extruded polystyrene boards have excellent waterproofing performance and extremely low water absorption rates, maintaining good thermal insulation performance even in humid environments. Additionally, they have superior moisture resistance and high compressive strength, making them suitable for thermal insulation projects in humid environments such as basements, bathrooms, and cold storage facilities.‌

Application scenarios

Rock wool boards: Suitable for high-rise buildings, public spaces, industrial plants, and other structures with strict fireproofing requirements. Their outstanding fireproofing performance and excellent thermal insulation and soundproofing effects make them perform exceptionally well in such applications.

Extruded polystyrene boards: Widely used in residential buildings, industrial plants, cold storage facilities, warehouses, and other applications requiring efficient thermal insulation. Their advantages are particularly evident in cold regions or environments requiring prolonged maintenance of indoor temperatures.