A Detailed Guide on Installing Backsplash with Cement Board
A kitchen backsplash not only protects the walls from water damage and stains but also adds style and visual interest to the space. When installing a backsplash, using cement board as a base provides durability and prevents moisture damage. Here is a detailed guide on installing backsplash with cement board.
What is Cement Board?
Cement board, also known as concrete backer board, is made from portland cement sandwiched between two fibrous layers. It is water-resistant, fireproof, mold-resistant, and highly durable. Cement board is commonly used as a substrate for tile and stone installations in wet areas like kitchens and bathrooms. It provides a stable base that resists damage from moisture over time.
Why Use Cement Board for Backsplash?
There are several benefits to using cement board for a kitchen backsplash installation:
- Moisture resistance – Cement board does not swell or degrade when exposed to water. This prevents damage to the backsplash and maintains its integrity over time.
- Prevents cracks – Cement board is dimensionally stable and does not flex or sag. This prevents cracking grout lines and loose tiles over time.
- Adds strength – Backsplashes see a lot of wear and tear. Cement board’s strength provides extra impact resistance and support for the tile.
- Fire resistance – Cement board is non-combustible and fire resistant. This adds an extra layer of protection and safety to the kitchen.
- Mold resistance – Cement board does not provide a food source for mold growth. This prevents unsightly and unhealthy mold buildup.
Step-by-Step Installation Guide
Installing backsplash with cement board is a relatively straightforward process. Here are the key steps:
Step 1 – Prepare the Wall
Start by removing any existing backsplash and cleaning the wall surface thoroughly. Fill any cracks or holes with spackle and sand smooth. Ensure the wall is flat, stable, and ready for cement board installation.
Step 2 – Cut Cement Board to Size
Measure the backsplash area and cut cement board pieces to size using a utility knife and straightedge. Wear safety goggles and gloves when cutting. Cut pieces so seams fall between two tiles.
Step 3 – Apply Adhesive Mortar
Mix non-modified thinset mortar as per package directions. Using a 1/4″ square notched trowel, apply a layer of thinset to the back of each cement board piece.
Step 4 – Fasten Cement Board
Press cement board pieces onto the prepared wall and fasten securely with backer board screws, placed 8″ apart across the entire surface. Ensure seams are butted tightly.
Step 5 – Tape and Mud Seams
Fill all seams with thinset mortar. Then embed alkali-resistant fiberglass mesh tape over each seam. Apply additional thinset over the tape for full coverage.
Step 6 – Seal Exposed Concrete
Once dry, seal all exposed concrete board edges and seams with silicone sealant. This prevents moisture intrusion.
Step 7 – Install Backsplash Tiles
Allow cement board to fully cure for 24 hours. Then apply thinset mortar and install backsplash tiles as desired per manufacturer instructions.
Step 8 – Grout and Seal
After another 24 hour curing period, grout the tiles and seal the grout lines. Clean excess grout haze and protect the finished backsplash with a grout sealer.
Cement Board vs. Drywall for Backsplash
While cement board is recommended for backsplash installations, some homeowners opt to install directly over drywall to save time and money. Here’s how the two substrates compare:
- Water resistance – Cement board is waterproof, while drywall degrades with moisture exposure over time.
- Mold resistance – Cement board resists mold growth, but drywall can become a food source for mold.
- Strength – Cement board is much more durable and impact resistant compared to drywall.
- Fire rating – Cement board is non-combustible, while drywall can burn.
- Cost – Cement board costs slightly more upfront but prevents expensive repairs down the line.
For most homeowners, the extra moisture protection and longevity of cement board makes it worth the small additional investment. It provides a worry-free base for a long-lasting, high quality backsplash.
FAQ About Backsplash Cement Board
Here are answers to some frequently asked questions about installing backsplash with cement board:
Does all backsplash need cement board?
Cement board is highly recommended for kitchen backsplash installations as it prevents water damage and mold growth. For low-moisture areas, drywall may suffice. Always check manufacturer tile installation instructions.
Can I install backsplash directly over drywall?
It is possible but not ideal. Drywall lacks water resistance and durability for backsplash installations. The backsplash may eventually fail without the protection of cement board.
What thickness of cement board should I use?
1/2″ thick cement board is suitable for most backsplash applications. Some manufacturers also offer 1/4″ and 5/8″ thicknesses. Follow tile product specifications.
How is cement board fastened to the wall?
Cement board is installed on the wall using backer board screws anchored to studs or furring strips, spaced 8 inches apart across the entire board surface.
Should plumbing fixtures go behind or in front of cement board?
Plumbing and fixtures should be installed over the face of cement board rather than behind it. This allows for removal and maintenance access in the future.
How long does cement board need to cure before tiling?
Allow cement board to cure fully for 24 hours before tiling to prevent cracks and adhesion issues. Be sure any moisture is thoroughly dried first.
Conclusion
Installing a kitchen backsplash over cement board instead of drywall provides long-term durability, water resistance, and mold prevention. The extra strength of cement board also supports heavy tile and stone backsplashes. While requiring a few additional steps during installation, cement board can save time and expense on repairs down the road. With proper thinset application and taping of seams, cement board offers a stable, crack-resistant base for a backsplash that will last for many years to come. Following the best practices outlined here will lead to a successful installation and a backsplash to be proud of.