For architects seeking the beauty and light-transmission advantages of glass block, here are tips on designing, detailing, and specifying this special kind of masonry: support glass block panels so they don't deflect; provide adequate support for the structure above panels; size panels within code limits; install expansion joints in panels that exceed area limits; detail panels with ladder-style joint reinforcement; secure panels to surrounding structure but provide for movement; use special glass blocks or steel posts to turn 90 degree corners; observe minimum radii in designing curves; provide drips to deflect rain rundown away from solar reflective glass block; and specify Type S mortar outside and Type N inside.