Can you use cement board instead of drywall?

Many homeowners look at cement board’s strength and think it’s a direct drywall replacement. But it’s not always simple.

Yes, cement board can replace drywall, especially in high-moisture areas like bathrooms and kitchens.

Cement boards resist water, mold, and fire better than drywall. This makes them perfect for wet zones like shower walls or exterior transitions. But their weight and workability issues mean they’re not ideal for every room.

What are the disadvantages of cement board?

Cement board’s durability comes with trade-offs that can limit its use.

It is heavy, difficult to cut and fasten, requires more installation time, and costs 30–50% more than drywall.

A cement board is about two to three times heavier than drywall. This increases handling effort and places greater stress on the wall structure. Its hardness makes cutting and drilling slow work. Installers often need special tools and must pre-drill holes for screws or nails. Labor costs rise due to the extra skill and time required. Material prices are also significantly higher, making full-home use expensive. I’ve seen cases where owners used cement boards throughout their homes and faced increased build times and costs beyond their initial budget. Choosing cement board only where its moisture resistance is needed can avoid these issues.

What is drywall cement?

Many people confuse “drywall cement” with cement board, but they are very different products.

Drywall cement is a joint compound used to fill seams between drywall panels, not a wallboard itself.

Drywall cement, also called joint compound or taping compound, is used during drywall finishing. It seals joints, covers fasteners, and prepares the surface for painting. It is made from gypsum, binders, and additives—not the Portland cement used in cement boards. I often meet homeowners who assume “drywall cement” means a water-resistant board, but it has no structural strength. Misunderstanding product names often leads to wrong purchases or inappropriate use, causing durability problems. Proper awareness of terms saves both money and installation trouble.

Can cement board be painted like drywall?

Some owners want a smooth painted wall even if using cement board. It’s possible—but not the same as painting drywall.

Cement board can be painted after applying a proper primer and finishing prep to smooth its rough, porous surface.

Cement board has a coarse texture with pores that absorb paint unevenly. To achieve a drywall-like finish, you first need to cover seams with joint tape and filler, then apply a surface-level compound to smooth the board. After drying and sanding, use a bonding primer before applying top coats. These extra steps add both time and cost. I’ve painted cement board for bathrooms after sealing it properly to protect against moisture. Results were good, but preparation was much more work than with drywall. In living spaces, gypsum board delivers a smoother, faster paint finish with less labor.

Conclusion

Cement board excels in wet areas but adds weight, cost, and difficulty. Drywall is still better for most living spaces, with cement board used only where needed.