The faucet for an undermount sink must be mounted on the countertop.
Faucet placement for undermount sink kitchen.
Undermount sinks can take up more space underneath the countertop which can interfere with the traditional faucet placement typically centered directly at the back of the sink.
The off center faucet a side handle faucet needs approximately 6 of clearance for the handle to move freely in both directions.
Here the faucet is centered on the sink the handle is 4 inches to the right of the faucet and both the soap dispenser and air switch are 8 to 9 inches from the faucet.
Faucets that require more than one hole should line up with one side of the sink or a tangent.
The undermount sink size includes one or two bowls which range in size from 8 to 20 inches from side to side and 18 inches from the front to the back of the sink.
With popularity of single hole faucets and larger undermount sinks for both the bathroom and the kitchen there are some design and functionality things to consider when determining the placement of the faucet.
In the kitchen picture below the use of a side handle faucet dictated that the faucet be placed off to the side so that it could function properly.
Dura supreme blog.
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This is slightly different from a top mounting rimmed sink.