How to Cut Quartz Countertops

Cutting quartz countertops to size for your kitchen or bathroom remodel project may seem daunting, but with the right tools and techniques, it can be done successfully as a DIY project. Quartz is an engineered stone made from ground quartz crystals held together with resin, making it incredibly durable and ideal for countertops. However, it requires specialized cutting methods compared to natural stone. Follow this guide to learn everything you need to know about how to cut quartz countertops.

What You’ll Need

Cutting quartz requires a high-quality diamond blade designed specifically for cutting engineered stones. You’ll also need safety gear and equipment:

  • Diamond blade for an angle grinder or circular saw designed to cut engineered stone
  • Angle grinder or circular saw with adjustable blade depth
  • Eye protection
  • Ear protection
  • NIOSH-approved respirator mask
  • Gloves
  • Clamps
  • Straight edge
  • Marker
  • Tape measure
  • Vacuum attachment

Make sure you are completely familiar with safe operation of your cutting tools prior to use. Have a shop vac ready to control dust.

Preparing to Make the Cut

Before cutting, take these steps:

  • Carefully measure and mark your cut lines on the quartz countertop using a straight edge. Double check measurements.
  • Use painter’s tape along cut lines to prevent chips and cracks.
  • Ensure your work area is free of debris and clutter.
  • Clamp your quartz countertop securely to a flat, stable surface like sawhorses. Keep the overhang supported.
  • Attach shop vac hose near cutting area to control dust. Wear PPE.

How to Cut Quartz Countertops

Follow these steps for a clean cut:

1. Score the Surface

Use your angle grinder with diamond blade to score the quartz surface along your cut line. Score at a 45° angle. Make several passes scoring deeper each time until you reach about 1/8″ depth. Go slowly to avoid cracking. Scoring creates a weak point for a clean break.

2. Make the Cut

Position your circular saw or angle grinder over your scored cut line. Set the blade depth to about 1/4″ deeper than the thickness of the quartz. Make a single pass along the scored line, going slowly and steadily. Let the tool do the work. Avoid excessive pressure.

3. Snap the Cut

After cutting through the quartz, place a straight edge along your cut line. Apply firm, even pressure along the length of the cut to break the quartz along the scored line. Work from both sides if needed.

4. Smooth the Edges

Use a diamond polishing pad or sandpaper to polish cut edges. Work your way from coarser to finer grit to achieve a smooth finish. Remove any small chips or unevenness. Rinse polished edges.

5. Clean Up

Carefully vacuum up all quartz dust. Use a damp microfiber cloth to wipe down the countertop and remove any remaining debris. Be sure to thoroughly clean your tools as well. Proper cleanup prevents breathing quartz dust.

Tips for Cutting Quartz Countertops

Follow these tips for best results when cutting quartz countertops:

  • Always use light, even pressure when cutting to avoid cracking and chipping. Don’t force the blade.
  • Cut 2-3 times along thicker countertops to prevent blade overheating. Allow blade to cool between passes.
  • For corners, make two 45° mitered cuts to achieve a clean finish.
  • Move slowly and steadily for straight cuts. Use a straight edge guide if needed.
  • Wear safety gear at all times and use dust extraction methods. Quartz dust is hazardous if inhaled.
  • Finishing edges with a polished bevel prevents chipping on the front edge.
  • If using wet cutting methods, dry countertop thoroughly before further fabrication to avoid water marks.

Frequently Asked Questions

Is it hard to cut quartz yourself?

With the proper tools and techniques, quartz can be cut successfully as a DIY project. The tricky parts are scoring properly before cutting and having the right blade. Going slowly and following safe practices makes the process very manageable.

What tools do I need to cut quartz?

You’ll need a diamond blade designed for cutting engineered stone paired with an angle grinder or circular saw. A straight edge, clamps, eye and ear protection, respirator mask, vacuum, and gloves are also required safety gear.

Can I cut quartz with a circular saw?

Yes, a circular saw outfitted with the right diamond blade is an excellent tool for cutting quartz countertops. Make sure to adjust the blade depth appropriately and take multiple shallow passes on thicker slabs.

What happens if I crack the quartz while cutting?

Small chips on the cut edge can often be polished out. However, cracks across the surface are difficult to repair. Prevent cracks by scoring properly before cutting, going slowly, and avoiding excessive pressure.

How thick of quartz can my angle grinder cut?

Most angle grinders with a 4 1/2” diamond blade can cut quartz up to about 1 1/4” thick. Passing through thicker material in multiple shallow passes helps avoid overheating and damage.

Cutting quartz countertops allows you to achieve custom sizing. With proper precautions and the right cutting techniques, it can be done successfully and safely by DIYers. Make sure to use the designed tools for engineered stone and keep safety as your top priority throughout the process. Patience and care when cutting will reward you with perfect results.