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How Does Calcium Silicate Board Perform Under Humid Conditions?

Calcium silicate board excels in humid applications due to its inorganic composition and low absorption rate. Unlike gypsum, it remains dimensionally stable when exposed to high relative humidity or occasional condensation, avoiding warping, swelling, or delamination under aluminum panel assemblies. The board’s dense fiber-reinforced matrix resists mold and mildew growth, maintaining a clean substrate for interior metal ceilings. Its high compressive strength supports evenly distributed loads from suspended aluminum panels without creep under sustained humidity. To maximize performance, installers should seal cut edges with moisture-resistant primers and ensure proper joint taping to prevent vapor intrusion from above. In pool areas or commercial kitchens, calcium silicate board can be combined with a vapor barrier and back-ventilated ceiling systems to manage moisture migration effectively. Over years of service, the board retains its structural integrity and fire-resistance rating, making it a preferred backing choice for aluminum ceilings in tropical climates and high-humidity facilities.


How Does Calcium Silicate Board Perform Under Humid Conditions? 1

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