20mm versus 40mm stone thickness. | Houzz AU
20mm versus 40mm stone thickness. wincymeow. 5 years ago. I have chosen a stone that I love for my kitchen benchtops, including a large island. it''s 20mm quartzite. We had planned to have it laminated around the edge for a 40mm look. The stone mason now says they''re not prepared to laminate because of the ''high risk'' of it cracking along the veins.