All CorStone sinks exceed A.N.S.I. and C.S.A. standards.

Important Note: All sink basket strainers MUST be installed with plumber's putty.

PLEASE NOTE: When using a CorStone sink in an undermount installation, please check style and size before cutting countertop.

For undermounting to granite, marble or solid surface materials other than wood, contact your fabricator for installation requirements and proper fasteners.

NOTE: Kitchen sinks are subject to normal wear and tear, and may need to be replaced from time to time. Any undermount installation should be designed to allow for easy removal and installation of a new sink in the future. CorStone shall not be liable for any costs associated with the installation or removal of any undermounted sink regardless of cause.

The following instructions are for installing CorStone undermount sinks. If you are installing a drop-in sink (mounted above the counter) please refer to the specific instructions for those sinks.

Note: A paper template is provided for all undermount sinks. Sinks with an undermount option, self-rim or drop-in installation, do not have paper templates available. DXF files for undermount sinks are downloadable from the web page of that specific model. The paper template is to be used as a guide only. Utilizing the actual sink will ensure a more accurate cutout. CorStone- supplied paper templates are intended to assist the fabricator/installer when preparing the countertop cutout. This template is sized for a zero reveal installation, where the countertop meets the edge of the sink flush to the bowls. Any variance from this standard is permissible, but must be based on agreement between the customer and the fabricator and/or installer and should conform to local codes. CorStone bears no responsibility for the fitness or accuracy of any countertop cutout. Install so future removal from underneath the countertop is possible without damaging the countertop or cabinet. CorStone will not be liable for damage of the countertop during or after installation. When using a CorStone undermount sink please check style and size before cutting countertop. For under-mounting to granite, marble or solid surface materials and any other countertop material, contact your fabricator for installation requirements and proper fasteners. CorStone recommends using a licensed professional fabricator to cut countertop and install undermount sinks for best results. Unpack the sink and inspect for any shipping damage before starting the installation. Do not install a damaged unit.

1. Observe all local plumbing and building codes.

2. Cutout the inside of the template (supplied) by carefully cutting along the inside of the cut line. Transfer to 1/4” plywood and cut template.

3. Determine the correct sink cutout location in the countertop. Use a framing square to layout center lines for sink placement. Plan for adequate clearance between the faucet holes and the countertop backsplash or finished wall. Use this measurement to locate the faucet centerline on the countertop. Do NOT use permanent markers to mark the center lines.

4. Position and secure the wooden template on the countertop so the template lines up with the drawn centerline.

5. Trace the cut-out opening onto the countertop. Again, do NOT use permanent markers.

6. Locate and mark the faucet holes.

7. Cut the opening per countertop manufacturer's recommendations by carefully following trace line.

8. Drill faucet holes per countertop manufacturers recommendations.

9. After hole is cut, sand the opening with appropriate grit sand paper and finish cut surface as required by countertop manufacturer.

10. Clean bottom of countertop and top flange of sink with denatured alcohol and apply a narrow bead of silicone adhesive sealant to top edge of bowl flange and position bowl.

11. Mount sink using mounting brackets and preferred fasteners. Tighten as necessary to secure sink to countertop.

12. Clean off excess silicone from countertop and sink. Inspect and fill any voids.

13. All CorStone products are fabricated to industry dimensional standards (+/-1/4”).