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Installation / Installation / Instalación
Undermount sinks are sinks that are attached from below the countertop. These instructions are for installing 1858
Brand undermount stainless steel sinks in a solid surface countertop only. Minimum thickness of the actual countertop
material is one half-inch. In addition, a one-inch build up around the sink is preferred. The manufacturer recommends
that undermount sinks and routering of your solid surface material should be installed by a professional installer for
best results. Requirements vary for installation in a granite, marble, stone, or butcher block countertop.
There are three ways an undermount sink can be installed; Positive Reveal, Flush, or Negative Reveal. Each different
reveal creates a distinctive look where the countertop and sink meet (see diagram below).
Positive Reveal - The countertop edge sits approximately 1/4" back from the edge of the sink, exposing the sink rim.
All 1858 brand undermount sinks feature a 1 inch finished rim. All 1858 brand undermount sinks feature an
approximate 1/4"positive reveal.
Flush - The countertop meets the edge of the sink. Fitting flush with the sink bowls
Negative Reveal - The counter top extends over the edge of the sink on all sides by approximately 1/4" . Use caution
with this installation to be sure that accessorie such as colanders or cutting boards will fit properly .
1858 Brands recommends that all countertops be cut by an approved or certified installer and that
the sinks be installed by the installer whenever possible. The countertop/sink unit ideally should be
installed as one on the jobsite. Please carefully read all instructions before beginning installation.
Undermount
Stainless
Steel Sinks
Revised
3/20/2020
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