What is maximum distance between posts for the Legato Glass Railing system? Post spacing should not exceed 42″ on center. Updated on June 12, 2018 Was this article helpful? Yes No Related Articles How is the glass set in the shoe moulding? Can acrylic be used with our Panel Grip profile? PanelGrip Installation Can you have a no cap glass rail? Is a Top Railing Required for Glass Railing? Why is glass deflecting when PanelGrip® system is attached vertically to metal beam on vinyl decking?