Cement board is widely used in bathrooms, kitchens and exterior applications because it provides a stable and moisture-resistant base for tiles and finishes. However, even the highest-quality board can fail if it’s installed with the wrong fixings. Cement boards are dense and alkaline, meaning they require corrosion-resistant fasteners designed specifically for the material.
Choosing the correct screws, anchors and fastening techniques ensures the board stays firmly attached to studs or substrates while preventing cracking, rust and long-term structural issues. Below are the key fixings every installer should consider for durable cement board installations.
- Cement Board Screws (The Essential Fastener)
The most important fixing in any cement board project is the specialised screw designed specifically for backer boards.
Cement board screws feature sharp points, deep threads and corrosion-resistant coatings so they can penetrate dense cement boards while resisting damage from the board’s alkaline composition.
If you’re installing cement board in areas such as bathrooms, wet rooms or tiled floors, using purpose-built screws is essential for a secure and lasting installation. Builders often choose to cement board screws because they:
- Provide strong holding power in both timber and metal studs
- Feature self-countersinking heads that sit flush with the board surface
- Resist corrosion in damp environments
- Reduce cracking or board damage during installation
For reliable performance, it’s best to use purpose-built fixings rather than general screws. Many professionals prefer to buy cement board screws that are specifically designed for this application, ensuring compatibility with fibre cement and tile backer boards.
- Self-Drilling Cement Board Screws for Metal Studs
When cement boards are installed on steel framing, self-drilling screws are often the best choice. These fasteners feature specialised drill points that cut through metal studs without requiring a pre-drilled hole.
This design speeds up installation and improves accuracy because the screw creates its own thread as it enters the substrate.
Benefits of self-drilling screws include:
- Faster installation on metal framing
- Reduced risk of stripping or misalignment
- Strong engagement with steel studs
- Secure fixing for heavy tile assemblies
They’re particularly useful in commercial projects or modern dry-lining systems where metal stud framing is common.
- Corrosion-Resistant Screws for Wet Areas
Bathrooms, wet rooms and kitchens expose fixings to constant moisture. Using standard screws in these conditions can lead to rust, weakened fasteners and eventual board movement.
Cement board screws are typically coated with zinc or other corrosion-resistant finishes to protect them in damp environments.
For high-moisture applications, consider:
- Exterior-grade coated screws
- Stainless steel fasteners
- Screws with anti-corrosion plating
These coatings help prevent degradation and maintain structural integrity for the life of the installation.
- Backer Board Washers for Extra Holding Power
In some installations, especially where thinner cement boards are used, washers are paired with screws to spread the load across a larger surface area.
Backer board washers help prevent screws from pulling through the board, which can happen when heavy tiles or stone finishes are installed.
Advantages of washers include:
- Greater load distribution
- Improved board stability
- Reduced risk of fastener pull-through
- Better performance on ceilings or vertical installations
They’re particularly useful when installing boards on uneven substrates or older framing.
- Galvanised Ring-Shank Nails (Alternative Fixing)
Although screws are generally preferred, galvanised nails can still be used in some cement board installations.
Hot-dipped galvanised nails provide corrosion resistance similar to specialised screws and can hold cement board securely when installed correctly.
However, they’re usually considered a secondary option because screws:
- Offer stronger clamping force
- Are easier to remove or adjust
- Provide more consistent fastening depth
For professional tiling or high-load installations, screws remain the better choice.
- Thin-Set Mortar as a Supporting Bond
While not technically a fixing, thin-set mortar plays an important supporting role in cement board installations.
Before fastening the board to a floor or substrate, installers often apply a thin layer of mortar underneath. This fills gaps, prevents movement and distributes weight evenly across the surface.
When used alongside screws, thin-set mortar:
- Prevents flexing under load
- Eliminates air pockets
- Improves tile longevity
- Reinforces the structural bond between board and subfloor
The mortar doesn’t replace mechanical fixings but works together with them to create a stronger installation.
Final Thoughts
Cement board installations are only as strong as the fixings that secure them. Using the correct fasteners ensures the board remains stable, moisture-resistant and capable of supporting heavy finishes like tile or stone.
From specialised cement board screws to corrosion-resistant coatings and reinforcement systems, each fixing plays a crucial role in the overall durability of the installation. When the right components are used together and installed correctly, cement board provides a dependable foundation that can last for decades without movement or failure.
Alex Hamilton 
Headlines Team