Controlling Storefront and Curtainwall Water Infiltration

The following article from Architect's Guide to Glass and Metal is definitely a worthwhile read:

 Controlling Storefront and Curtainwall Water Infiltration

Most architectural aluminum glazing systems are not designed to be totally waterproof. Rather, most systems are designed to control water infiltration under extreme conditions and weep that water back to the exterior. Storefront and curtainwall systems differ in many ways: appearance, profiles, windload resistance, glazing, thermal performance and how they weep water. This discussion focuses on how storefront and curtainwall handle water disbursement differently.

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