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Dimensions: 15.75" L × 15.75" W × 4.625" H
Weight: 20.6 lbs
Mounting: Vessel
Drain: 1.50" non-overflow
Bowl Capacity: 2.40 gallonsEach sink is cast by hand, so slight variation in size may occur.
Technical Documentation:
Spec Sheet (PDF)
Installation Guide
Warranty Information -
Modterra pieces are made from GFRC concrete and finished by hand in our Colorado studio.
Because concrete is a natural material, each piece will show subtle variation in tone, texture, and surface detail. Small surface pores, often called pinholes, may also be present. These are a natural byproduct of the casting process and do not affect the integrity of the piece.
These characteristics are part of the material and make every piece unique.
Over time, the surface develops a soft patina through water and daily use.
For the best sense of color and texture, we recommend ordering a sample kit before making your final selection.
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Each Modterra sink is cast by hand in our Colorado studio after your order is placed. Production typically takes 3–4 weeks before shipment.
Free shipping within the contiguous U.S. Orders ship via insured ground service with typical transit times of 3–7 business days depending on location. Tracking information will be provided once your order leaves the studio.
Need it sooner? Contact us. We occasionally have ready-to-ship pieces available and may be able to accommodate rush production.
For full details, visit our Shipping & Returns page.
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Modterra pieces are sealed and designed for everyday use.
Clean with a soft cloth or sponge and mild soap. Avoid abrasive cleaners, scouring pads, or harsh chemicals, which can break down the sealer over time.
For full care instructions, visit our Care & Maintenance Guide.
FAQ
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Clean your concrete sink once a week with a soft cloth, mild soap, and water. That's it.
Rinse and dry anything acidic right away, the same way you would treat natural stone. If water ever stops beading on the surface, email us and we'll advise. Read the full care and maintenance guide.
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Yes. Modterra sinks are integrally pigmented, so the pigment goes into the concrete mix before casting and there is no color layer on the surface. If the edge ever chips, the color underneath is the same.
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Yes. The Caldera is 15.75 inches across, sits 4.625 inches above the counter, and weighs 20.6 pounds, which makes it the smallest and lightest of the three. The round shape also frees up the counter corners that a rectangular basin would take. Measure your counter depth and leave room behind the basin for the faucet before you order.
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The Caldera installs just like any other vessel sink. It sets on the counter over clear silicone and connects to standard non-overflow drain hardware up to 1.5 inches, with no clamps or mounting hardware involved. We recommend a licensed professional, and the guide is at modterra.com/technical-documents.
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Modterra casts in GFRC, where glass fibers run through the whole mix. That makes it stronger and lighter than traditional cast concrete and lets it hold fine detail, like the edge on the Caldera. Structural cracking is not expected under normal use, and structural integrity is covered for life on a residential install.
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