How to Install a Soapstone Countertop: Step-by-Step Guide

How to Install a Soapstone Countertop: Step-by-Step Guide

Installing a soapstone countertop is a rewarding DIY project that can dramatically upgrade your kitchen or bathroom. Soapstone is prized for its durability, heat resistance, and natural beauty. While it’s softer than granite or quartz, it’s easier to cut and shape, making it a favorite among DIYers. This guide walks you through every step—from preparing your cabinets to finishing the seams and installing your sink.

Preparing for Installation

Before you begin, ensure your cabinets are ready to support the weight of the soapstone. Proper preparation is crucial for a smooth installation.

• Remove the cabinet toekick and drawers for easier access.
• Use a 4-foot level across adjacent cabinets to check for height differences.
• Shim under cabinet feet to level and align the tops.
• Clamp cabinets together at the stiles along drawer openings.
• Secure cabinets by driving 2½-inch deck screws through the stiles.

Repeat this process until all cabinet tops are flush and level. This provides a solid foundation for your soapstone countertop.

Measuring and Creating a Template

Accurate measurements are essential for a perfect fit. For simple layouts, you may skip creating a template, but for complex spaces, a template is highly recommended.

• Measure your cabinet layout, including any overhangs or exposed sides.
• Transfer these measurements to a cardboard or MDF template.
• Use the template to mark the soapstone slab for cutting.

Having a template ensures your countertop fits perfectly and minimizes the risk of errors during cutting.

Cutting the Slab to Size

Cutting soapstone is straightforward with the right tools. Always work in a well-ventilated area to reduce dust inhalation.

• Measure the length and depth of your cabinets, including any desired overhang.
• Transfer these measurements to your soapstone slab.
• Support the slab on 2x4s to raise it off the ground.
• Use a circular saw with a diamond blade and a straightedge guide to cut the stone to length.
• Repeat the process for depth, ensuring the countertop fits your cabinet dimensions.

Tip: To prevent scratching the circular saw’s shoe, cover it with masking tape or painter’s tape before cutting the stone.

Cutting Slots for the Sink Bolts

If you’re installing an undermount sink, you’ll need to cut slots for the sink bolts. This step ensures the sink is securely fastened to the countertop.

• Carefully turn the slab on edge and prop it up, exposing the underside.
• Mark the stone at the top and bottom of the two sink cutout sides, about an inch away from the edge and the corners.
• Using a grinder, cut short, 1/8- to 1/4-inch-deep grooves at your marks.
• With the wheel in the groove, tilt the grinder sharply to either side to make a small pocket inside the stone.
• Leave one end of the groove wide enough to slide the head of a sink bolt into the groove.

Checking the Bolts’ Alignment

Before moving the stone, check that the sink bolts and clips align correctly.

• Thread a sink clip onto a bolt and screw on a wing nut.
• Slide the head of the bolt into the grooves around the cutout.
• Check that the clip will reach close enough to the cutout to brace the flange of the undermount sink.
• Remove these bolts and clips, and set them aside before moving the stone.

Installing the Soapstone Countertop

With your soapstone cut and shaped, you’re ready to install the countertop. This process involves carefully placing the stone, creating seams if necessary, and setting any fixtures.

Dry Fitting the Countertop

Before installation, dry fit the countertop to ensure proper alignment.

• With help, carefully carry the slab on its edge to the cabinets.
• Gently lay the slab into position on the cabinets.
• If using multiple pieces, butt them together and check for flush alignment.
• Shim the cabinets or slab as needed to ensure full support and proper alignment.

Creating and Securing Seams

For countertops made from multiple pieces, creating inconspicuous seams is important.

• Pull the slabs apart slightly and mask off the top edges with painter’s tape.
• Mix the two-part epoxy adhesive according to the manufacturer’s instructions.
• Apply adhesive liberally to both edges, ensuring it fills any grooves or slits.
• Push the slabs back together and apply pressure for five to 10 minutes.
• Remove excess adhesive and painter’s tape.
• Once set, sand the seam with 220-grit sandpaper until flush and smooth.

Setting the Sink

Undermount and overmount sinks require different steps for installation.

• For undermount sinks, apply a bead of silicone along the sink’s flange.
• Position the sink under the cutout and secure it temporarily with a bar clamp.
• Adjust the sink for an even reveal around the opening.
• Install sink bolts and clips in pre-cut grooves to secure the sink permanently.
• For overmount sinks, simply apply silicone under the sink’s flange and drop the sink into place. Press down until the sink is flush with the countertop, and clean any excess silicone that oozes out with denatured alcohol.

Bolting Down the Sink

Move under the counters to install the sink bolts and clips in the grooves and tighten them over the flange. Be careful not to overtighten the nut, which could crack the soapstone. Let the silicone cure overnight before plumbing the sink from underneath the counter. Squeeze a bead of sealant along the seam between the stone and the cabinets.

Finishing Touches

Once the countertop and sink are installed, finish the job with these final steps.

• Sand any rough edges with 220-grit sandpaper.
• Apply mineral oil to the soapstone to enhance its color and protect the surface.
• Wipe down the countertop with a clean cloth to remove any dust or debris.

FAQs

Do I need plywood underlayment for soapstone countertops?

While not always necessary, a 5/8-inch plywood underlayment can provide additional support and stability, especially for larger countertops or uneven cabinets.

Can I cut soapstone with a regular saw?

Yes, you can cut soapstone with a circular saw equipped with a diamond blade. Always use a straightedge guide and work in a well-ventilated area.

How do I maintain a soapstone countertop?

Soapstone is low maintenance. Regularly apply mineral oil to keep the surface looking its best and protect it from stains.

Can I install an undermount sink in soapstone?

Yes, undermount sinks can be installed in soapstone. Cut slots for the sink bolts and use silicone and clips to secure the sink in place.

How long does it take to install a soapstone countertop?

Installation time varies depending on the complexity of the layout and your experience. Most DIYers can complete the job in a day or two.

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