Many people compare gypsum board only by price. They miss the hidden costs that show up years later.
A standard gypsum board sheet usually costs between 30 and 60 RMB, while waterproof types range from 100 to 150 RMB or more.
Cheap boards seem attractive at first, but repairs and replacements in damp areas can cost more over time. The smart choice matches the board type to its environment.
What thickness is waterproof gypsum board?
Buyers often do not check thickness when shopping for boards, yet it changes durability and performance.
Most waterproof gypsum boards are between 12.5mm and 15mm thick, with some heavy-duty options going up to 18mm.
Waterproof gypsum boards are coated or treated to resist moisture penetration, making them essential for kitchens, bathrooms, and other damp areas. Thickness affects both strength and lifespan. A 12.5mm board works well for standard wall partitions, but a 15mm board offers more stability, especially for ceilings or heavy tile finishes. In my projects, thicker boards last longer in high-humidity areas. A well-installed 18mm waterproof board in a bathroom can last two to three times longer than a standard board in the same conditions. When choosing, remember that thickness also means extra weight, which increases labor effort during installation.
What is the price of waterproof plaster?
Many people confuse waterproof gypsum boards with waterproof plaster, but plaster is a finishing layer, not a panel.
Waterproof plaster typically costs between 8 and 20 RMB per kilogram, depending on brand, additives, and performance level.
Waterproof plaster is applied over boards or brick walls to create a smooth, moisture-resistant surface. Its cost depends on quality and mixing formula. Some contain polymers that improve adhesion and resistance to cracking. In my experience, cheaper plaster is fine for dry spaces, but in damp rooms, premium waterproof plaster is worthwhile. Over the years, I have repaired many surfaces that failed because low-cost plaster absorbed moisture, leading to mold and peeling paint. When you calculate maintenance costs, the savings from buying premium plaster are clear. Good waterproof plaster also adds to fire safety, strength, and the wall’s overall finish.
What is the price of 18mm gypsum board?
Thicker boards are often seen as excessive by buyers, but they have clear structural advantages.
An 18mm gypsum board usually costs more than 30% above the price of standard thickness boards, depending on whether it is standard or waterproof.
The 18mm board is most often used in high-strength or high-moisture applications. Its added thickness increases rigidity and reduces flexing, which is important when boards carry heavy finishes like ceramic or stone tiles. In wet areas such as commercial kitchens or hotel bathrooms, the 18mm waterproof version ensures that walls resist swelling and deformation even under heavy use. Yes, it costs more at purchase, but it can prevent expensive repairs later. Many owners who chose standard thin boards for these spaces had to replace them within five years. With the 18mm board, the lifespan often extends beyond fifteen years, saving both materials and labor in the long run.
Conclusion
Gypsum board price depends on type, thickness, and use environment. Choosing for durability saves more in life-cycle costs than focusing only on the initial price.
