|
WIND |
|
There
are no regions of North America categorically immune to potentially
destructive winds. Western peaks, valleys, plains and deserts are subjected
to the most consistently high winds, except for occasional hurricanes and
tornadoes. Wind gusts of 80 miles per hour are not uncommon in these areas.
The highest wind speeds recorded in the last fifty years in these high wind
areas are:
► Colorado
130 mph (200 mph - once in 1997)
► Kansas
126 mph
► Nebraska
115 mph
► Wyoming 115
mph
These winds can tear off, or repeatedly lift and weaken the
roof covering, eventually threatening its ability to protect the interior of the
building from moisture. |
 |
| |
|
Use the following map to estimate the potential for wind damage to your
roof. |
|
|
Interestingly, roofs are frequently damaged on the downward side of a
roof/house due to the upward lifting forces generated by the vacuum
created as wind passes over the ridge (highest point) of the roof.
|
|
Roofing materials/systems
vary greatly in both their inherent wind resistance and the methods used to
improve their installed (system) wind resistance. Very flexible materials
(rubber) usually require additional nailing strips and fasteners.
Inflexible materials (concrete, clay, slate) usually have predrilled holes
for fasteners, and need special hold down clips for high wind tolerance.
View a
summary of wind resistance of
popular roofing
products.
|
|
Ce·DUR and Wind |
|
Ce·DUR Shakes have unique flexural characteristics -
somewhere between flexible and inflexible. They flex slightly to give with
the wind, require no special installation accessories or labor to achieve a
110 mph rating, have no predrilled fastener holes for greater installation
flexibility, install directly on the roof deck leaving no gap for wind to
penetrate, and can be easily up-rated for higher than 110 mph by adding
additional fasteners.
The Ce·DUR Shake,
fastened by just two (2) standard roofing nails, has received the highest
rating possible from Underwriters Laboratories, Inc. The test creates 110
mile per hour winds (UL 997 protocol). Additional fasteners (nails or
staples) may be used in
very high wind areas, without concern for splitting or breaking a Ce·DUR
shake.
|
|
7" wide Ce·DUR Shake
with 3 fasteners -
no splitting
|
 |
No predrilled fastener holes - accepts nails or staples.
|
|
|
|
|
|
|
|
|
