Undermount sinks install on laminate counter tops differently than on granite or stone.
Remove cast iron sink from laminate counter top.
Ensure the available cast iron sink will fit before you begin cutting.
If your sink s flange is secured to the granite with glue or a similar substance you ll need to remove it but it s likely that you need only lift the sink up and out of its place in the granite countertop.
There s no way around it.
Measure and mark out the cut for the sink hole in the countertop and surrounding cabinetry by measuring the width and length of the bowl s.
Don t include the lip in the countertop cut as the lip will support the sink.
The idea here is to separate the countertop from the underside of the sink without tearing the plastic laminate apart.
If you are referring to laminate covered counter tops that have 5 8 particle board as a substrate you are fine.
There are typically two to four bolts holding the sink in place.
Be careful with the sink s removal as dropping it will likely damage the stone counters.
So unless the sink has loosened of its own accord i e.
These type counter tops have been used with cast iron sinks for decades.
The sink installs flush to the laminate not below the surface of the counter to prevent water from soaking into the particleboard.
If you re planning on junking the top anyway then don t worry about damaging the formica.
If you do you will most likely break the plastic laminate on the countertop.
This means an entirely different mounting procedure is necessary for an undermount sink with laminate countertops.
The original gluing was not done properly or the glue has just released due to age you will have to break the sink apart to get it out.
The smaller pieces are easier to pry off and the odds of successfully removing the sink are improved.