[RE-wrenches] Hurricanes And Economic Cost and Metal Roofs

[Tom Lane]

Adding a third rail I only for the first and last module on roofs when they
are mounted on roofs when they are flat to the roof doesn't add much cost .
The suction force and uplift force are the greatest on raised modules on
flat roofs   . HOWEVER PEELING occurs on all arrays flat or raise . When
the first module in a row or bank  goes the the shearing forces moves down
the row one at at time stripping the panels or modules BECAUSE that module
acts as a wind shield UNTIL it is gone . The suction of glass out of the
frame occurs on raised modules and the uplifting occurs on the back of
raised arrays . The additional short rail and 1/2 of a mounting set on the
module on the end of raised banks IS CRUCIAL and the X cross bracing of at
least the first two and last two modules is CRITICAL to prevent peeling.
The time to train installers WHY this is important AND to educate building
inspectors AND the purchaser why this is important for the future economic
value of raised modules in Hurricane or tornado areas . Mounting all the
modules with a third rail is prohibitively expensive unless you are using
72 cell modules. Insurance DEDUCTIBLES are high after Hurricanes hit and
normally there are other critical expenses the owner has due to storm
damage . The use of 3/8 SS bolts instead of 5/16 SS bolts adds little cost
. As an added note Insurance companies about five years ago Nationwide
started requiring new water heaters AND new asphalt shingles roofs to get
insurance. A cost to the seller or new owner , metal roofs are now nearly
the cost of asphalt shingles. Metal roofs are much more fire resistance
also . GatorTom
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