FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

11 Designing the builDing envelope Volume II
and test standards that were used to evaluate the pressure and impact resistance. Without a label, ascertaining
whether a window or shutter has sufcient strength to meet pressure and wind-borne debris loads is difcult
(see Figure 11-12). It is therefore recommended that design professionals specify that windows and shutters
have permanently mounted labels that contain the type of information shown in Figure 11-11.
Figure 11-11.
Design pressure and
impact-resistance
information in a
permanent window label.
Hurricane Ike (Texas,
2008)
Figure 11-12.
Roll-up shutter slats
that detached from the
tracks. The lack of a
label makes it unclear
whether the shutter was
tested in accordance with
a recognized method.
Estimated wind speed:
110 mph. Hurricane
Katrina (Louisiana, 2005)
Glazing Protection from Tile Debris
Residential glazing in wind-borne debris regions is required to
resist the test missile C or D, depending on the basic wind
speed. However, feld investigations have shown that roof tile
can penetrate shutters that comply with test missile D (see
Figure 11-13). Laboratory research conducted at the University
of Florida indicates that test missile D compliant shutters do
not provide adequate protection against tile debris (Fernandez
et al. 2010). Accordingly, if tile roofs occur within 100 to 200
feet (depending on basic wind speed), it is recommended that
shutters complying with test missile E be specifed.
Cross referenCe
More information, including a
discussion of various types of
shutters and recommendations
pertaining to them, is available
in Fact Sheet 6.2, Protection of
Openings – Shutters and Glazing,
in FEMA P-499.
11-12 COASTAL CONSTRUCTION MANUAL