1. Glass Type & Thickness - standard 1/4" (6mm) thick "plate" glass, also known as "sheet" or "annealed" glass. You will want to ask the glass shop to sand or grind the edges so it will not cut you. DO NOT USE tempered glass. If any amount of damage occurs to the glass, you won't have a tiny leak, you'll have an explosion of tiny pieces of glass all over. If you go the glass route find a window repair shop, give them the dimensions and go from there. I like my local Lowe's better than home depot but for my on personal reason would go to a specialist before the big boys.