First of all, choose whether the glass package is interested with two glasses (U = about 1.1) or with three glasses (U = about 0.6). When choosing the amount of glass, consider whether you are interested in transparent glass packages, or tinted / frosted and other types.

Double glazing can be from 16 mm to 32 mm thick, triple glazing can be from 28 mm to 56 mm total thickness.