47.5 MB - The Whole Building Design Guide

Figure 4-44:Roof damage at HancockCounty EOCFire stations are especially susceptible to breaches of the buildingenvelope, because of their large sectional and rolling doors thatare usually not strong enough to resist wind forces, and even lessso the hydrodynamic forces of storm surge. The apparatus baydoors failed in many fire stations affected by flooding. (see Figures4-39 and 4-45).Water and wind from the storm were able to penetrate the buildingswhen the doors were breached, causing subsequent damageto other systems and equipment. Large doors should be designedto withstand wind pressures and windborne debris impact as recommendedin Section 3.4.3.1.All doors and windows can also be replaced with modern, impact-resistantsystems that would reduce the chances of buildingpressurization and rainwater infiltration, which resulted in heavylosses to equipment and contents during Katrina. Rooftop unitsthat were blown off and damaged the building envelope by puncturingthe roof covering should be securely anchored to preventsuch damage in the future.4-60 OBSERVATIONS ON THE PERFORMANCE OF CRITICAL FACILITIES