Cement board, HardieBacker, and GoBoard are the three most common substrates for tile installation, and the right choice depends on weight, waterproofing needs, and how the material is cut and installed. Cement board and HardieBacker are both cement-based products and perform similarly, with HardieBacker being a specific fiber cement brand rather than a separate category. GoBoard is a different material entirely, a foam core board with a built-in waterproof coating, which eliminates the need for a separate waterproofing membrane in many applications. All three are suitable substrates for tile, but they are not interchangeable in every situation.
This guide breaks down what each one is, how they differ in practice, and which is the better fit for common installation scenarios.
Table of Contents
- Cement Board
- HardieBacker
- GoBoard and Foam Backer Board
- Side-by-Side Comparison
- Which One Should You Choose?
- Common Mistakes to Avoid
Cement Board
Cement board is a rigid panel made of Portland cement reinforced with fiberglass mesh. It has been the industry standard tile substrate for decades because it is dimensionally stable, will not deteriorate from moisture the way drywall does, and provides a strong, flat surface for thinset to bond to. Cement board does not waterproof a wall or floor on its own. It still requires a separate waterproofing membrane in any wet area application, applied over the seams and screw points after the board is installed.
Cement board is heavier than foam alternatives and requires a jigsaw or a scoring knife with more effort to cut compared to foam board.
HardieBacker
HardieBacker is a specific brand of fiber cement backer board, similar in composition and performance to generic cement board but manufactured with a proprietary formulation that many installers find easier to score and snap compared to some generic cement board products. Functionally, treat HardieBacker the same as cement board: it requires a separate waterproofing membrane in wet areas, and it is not a standalone waterproof system on its own.
The practical difference between HardieBacker and generic cement board mostly comes down to consistency and ease of cutting rather than a fundamental difference in performance.
GoBoard and Foam Backer Board
GoBoard and similar foam-core backer boards use a rigid foam core with a fiberglass mat and coating on both faces, and critically, most foam backer board products are waterproof on their own once seams and fasteners are properly treated with the manufacturer's sealing system. This can eliminate the need for a separate liquid or sheet waterproofing membrane in many applications, simplifying the installation process.
Foam backer board is significantly lighter than cement board, which makes it easier to handle on ceilings or large wall sections, and it cuts cleanly with a utility knife rather than requiring a jigsaw or scoring tool. It is generally more expensive per square foot than cement board.
Side-by-Side Comparison
- Weight: Cement board and HardieBacker are heavier. Foam board is significantly lighter.
- Waterproofing: Cement board and HardieBacker require a separate membrane in wet areas. Foam board is often waterproof on its own once seams are sealed per the manufacturer's system.
- Cutting: Cement board and HardieBacker require a jigsaw, scoring knife, or cement board shears. Foam board cuts cleanly with a utility knife.
- Cost: Cement board is generally the least expensive per square foot. Foam board is typically the most expensive.
- Best for: Cement board and HardieBacker work well for floors and standard wall applications. Foam board is popular for showers, ceilings, and curbs where its built-in waterproofing and light weight are a bigger advantage.
Which One Should You Choose?
For a standard floor installation in a dry area, generic cement board is usually the most cost-effective choice, since waterproofing is not a factor. For a shower or other wet area, the decision comes down to whether you want to install a separate waterproofing membrane over cement board or HardieBacker, or use a foam board system designed to handle waterproofing as part of the substrate itself. Many professional installers use foam board specifically in showers for this reason, since it can simplify the number of steps and products involved.
For the full waterproofing process regardless of which substrate you choose, see our Shower Wall Tile Installation guide.
Common Mistakes to Avoid
- Assuming cement board or HardieBacker is waterproof on its own without an added membrane
- Not following the specific seam-sealing system required for foam board to actually be waterproof
- Using standard drywall screws instead of corrosion-resistant fasteners rated for backer board
- Skipping the manufacturer's fastener spacing pattern, which affects the structural integrity of the substrate
Ready to plan your substrate and waterproofing system? See our full Installation Blog for step-by-step guides by application and material.
