FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

Volume II Designing the builDing envelope 11
other siding or panel materials (see Figure 11-15).
Problems with aluminum and fber cement siding note
have also occurred (see Figure 11-16).
Siding
A key to the successful performance of siding
and panel systems is attachment with a sufcient
number of proper fasteners (based on design loads
and tested resistance) that are correctly located.
Fact Sheet 5.3, Siding Installation and Connectors,
in FEMA P-499 provides guidance on specifying
and installing vinyl, wood siding, and fber
cement siding in high-wind regions.
Brick Veneer
COASTAL CONSTRUCTION MANUAL
In areas that experience frequent wind-driven
rain and in areas that are susceptible to high
winds, a pressure-equalized rain screen design
should be considered when specifying wood
or fber cement siding. A rain screen design
is accomplished by installing suitable vertical
furring strips between the moisture barrier
and siding material. The cavity facilitates
drainage of water from the space between the
moisture barrier and backside of the siding and
facilitates drying of the siding and moisture
barrier.
For more information, see Fact Sheet 5.3,
Siding Installation in High-Wind Regions, in
FEMA P-499.
Figure 11-15.
Blown-off vinyl siding
and foam sheathing;
some blow-off of interior
gypsum board (circle).
Estimated wind speed:
130 mph. Hurricane
Katrina (Mississippi,
2006)
Blow-of of brick veneer has occurred often during high winds. Common failure modes include tie (anchor
corrosion), tie fastener pull-out, failure of masons to embed ties into the mortar, and poor bonding between
ties and mortar, and poor-quality mortar. Four of these failure modes occurred at the house shown in Figure
11-17. Te lower bricks were attached to CMU and the upper bricks were attached to wood studs. In addition
to the wall covering damage, roof sheathing was blown of along the eave.
11-17