How to Cut Cultured Marble Backsplash

Cultured marble is a popular material for kitchen and bathroom countertops and backsplashes. It provides the look and feel of natural stone while being easy to maintain. However, cutting cultured marble requires some special considerations to get clean, smooth cuts without damaging the material. Follow these steps for successfully cutting cultured marble backsplash tiles or around sinks and fixtures.

Gather the Proper Tools

Cutting cultured marble backsplash or countertops requires using the right tools for the job:

  • Circular saw with a diamond blade – The diamond-tipped teeth on the blade are essential for cutting through the marble aggregate without cracking or chipping it. Use a 4-1/2 or 5-inch diameter saw.
  • Safety gear – Wear safety goggles, ear protection, gloves, and a dust mask when cutting to protect yourself from debris.
  • Clamps – Clamp a straightedge guide to the cultured marble to ensure straight, accurate cuts.
  • Spray bottle with water – The water helps lubricate and cool the blade during cutting.
  • Duct tape – Run duct tape along the cut line to prevent chipping when the piece separates.

Measure and Mark the Cut Lines

Always measure twice and cut once for the most accurate, clean cuts:

  • Use a pencil to lightly mark your cut lines on the cultured marble backsplash. Don’t press hard enough to indent the surface.
  • Mark the dimensions from the edge of the sink or fixture to the wall to fit the backsplash properly around them.
  • For outlet cutouts, trace the exact shape and size of the electrical box on the backsplash.
  • Ensure all marks are straight, level, and square for even cuts.

Set Up with Safety in Mind

When setting up to cut cultured marble, focus on stability and safety:

  • Lay the cultured marble on a flat, stable surface like sawhorses for support.
  • Clamp a straightedge guide along the cut marks to ensure accuracy.
  • Position the circular saw to cut through the cultured marble and avoid your straightedge guide.
  • Wear goggles, ear protection, gloves, and a dust mask – cultured marble cutting creates fine debris.
  • Keep bystanders away from the cutting area.

Cut Slowly and Carefully

Go slowly with the circular saw along the cut lines to prevent cracking or chipping:

  • Keep the saw blade moving steadily through the cut – don’t pause in one spot.
  • Apply light pressure so the blade cuts through the cultured marble without you forcing it.
  • Stop occasionally to spray the blade with water to keep it cool.
  • For outlets or curves, make relief cuts first then go back to complete the cutout shape.
  • For long cuts, use duct tape along the cut line to reduce chipping when the piece separates.
  • Support cut pieces as they separate to prevent cracking.

Smooth and Finish the Edges

The final steps help smooth the cut edges and finish the project:

  • Use 200-grit wet/dry sandpaper to smooth cut edges. Apply gently to avoid rounding over corners.
  • Wipe away marble dust with a damp cloth after sanding.
  • Apply clear silicone caulk along the cut edge for extra moisture protection.
  • Let caulk fully cure for 24-48 hours before installing the backsplash.
  • Follow manufacturer instructions for cultured marble seams and polishing.

With the right tools and techniques, DIYers can get professional-looking results cutting cultured marble backsplash. Focus on safety and go slowly for clean, smooth cuts around sinks, outlets, and fixtures. The finished product resists moisture, heat, and stains while adding luxury to the kitchen or bath.

Frequently Asked Questions About Cutting Cultured Marble Backsplash

What type of blade should I use to cut cultured marble?

Use a diamond-tipped circular saw blade designed for cutting ceramic tile and marble. The diamond teeth will cleanly cut through the marble aggregate in cultured marble. A 4-1/2 or 5-inch diameter blade is best.

Can I use my miter saw to cut cultured marble backsplash?

Miter saws are not recommended for cultured marble because the saw may chip or crack it. A circular saw with a diamond blade and straightedge guide is the best option.

What speed should I set the circular saw for cutting cultured marble?

Cut cultured marble at a moderate speed setting on your circular saw. Cutting too slowly can cause chipping, while too fast can overheat the blade. Find a steady, even pace that keeps the blade moving through the cut.

How do I cut outlet and fixture holes in cultured marble backsplash?

Start by drilling a 1/4″ pilot hole inside the corners of the outline. Then use a jigsaw to cut out the shape staying just outside your line. Finally use a rasp and sandpaper to refine the cutout to your line.

Can I cut cultured marble backsplash with a wet tile saw?

Wet tile saws are not suitable for cultured marble. The water spray will degrade the bonding agents in cultured marble over time. Use a circular saw with a diamond blade and just water sprayed on the blade.

How do I get clean 90-degree cuts in cultured marble?

Clamp a straightedge guide to the cultured marble aligned with your cut line. Run the base plate of the circular saw along the straightedge guide for a perfect 90-degree cut.

How do I cut a hole for an electrical outlet in cultured marble backsplash?

Trace the exact shape of the electrical box on the cultured marble. Drill pilot holes and use a jigsaw to cut out the shape staying just outside your line. Use a rasp and sandpaper to refine the hole to your outline.


Cutting cultured marble backsplash brings the beauty of stone to the kitchen or bath without natural stone’s fragility or price. With the proper diamond-tipped blade, safety precautions, and careful technique, DIYers can achieve clean, smooth cuts. Measure twice, cut slowly, and smooth the edges for long-lasting, moisture-resistant installations. Paying attention to details like outlet sizing and caulking will help the project look professionally done.