Alpine Overhead Doors, Inc. has a state of the art factory
Storefronts need security and durability. Alpine's Steel Vision door give both security and durability, yet offers a clear view of the outdoors. Please see our Product index for the Mall and Storefront door to suit your needs.
Upon analyzing the calculations for deflection, slat stresses and mounting conditions, I have concluded that a reasonable specification for deflection of roll up doors would be L/20 for doors greater than 20 feet wide and L/25 for doors less than 20 feet wide. In designing roll up doors they are generally allowed to deflect [...]