Calcium silicate board and light steel keel each have their own characteristics and applicable scenarios, and the comparison of durability should consider specific usage environments and conditions:

　　Calcium silicate board:

　　?Material characteristics: Calcium silicate board is a new type of environmentally friendly building material, mainly composed of calcium silicate cement and inorganic fiber reinforced materials, with excellent compressive, fire-resistant, and sound insulation properties.

　　?Durability: Calcium silicate board has good durability under normal use conditions, and is not easily affected by moisture, deformation, or invasion by mold and pests. It is usually used for wall partitions, ceilings, and other parts, and can maintain stable performance for a long time.

　　Lightgage Steel Joist:

　　?Material characteristics: Light steel keel is made of light steel material, usually galvanized or treated with anti-corrosion, which has good corrosion resistance and strength.

　　?Durability: Light steel keel is suitable for structural support such as suspended ceilings and partition walls, and can bear certain loads. With proper use and maintenance, it can maintain structural stability for a long time.

　　Durability comparison:

　　?The durability of calcium silicate board is mainly reflected in its moisture resistance, mold resistance, fire resistance, and impact resistance, making it suitable for use in places that require high moisture and sound insulation requirements.

　　?The durability of light steel keel depends on the quality of its material and surface treatment, which is more suitable for places that require structural strength and stability.

　　Conclusion:

　　In indoor decoration, calcium silicate board and light steel keel are usually used in combination, each exerting its own advantages. For example, calcium silicate board as a partition material and light steel keel as a supporting structure together form a stable and durable wall or ceiling system.

　　Therefore, it cannot be simply said that calcium silicate board is more durable than light steel keel or vice versa. Instead, the appropriate material combination should be selected according to specific usage scenarios and needs to ensure the stability and long-term effectiveness of the overall structure.