Tips for HEAVY sink install
The best method for support is to pre-build a cradle using 2x4's. You can attach these to the sides with strong screws. It should also be supported, by installing "legs" under the horizontal cradle section's 4 corners. This transfers the weight load of the sink down to the floor.
If the sink is heavy now, imagine how heavy it will be full of dishes and water. This needs to be done right.
We just did this last week on a kitchen remodel. The sinks was a large soapstone one. We built the cradle-like frame, and installed such legs under all 4 corners of the "cradle", for additional support.
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