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CASE A1 - Roofing and Waterproofing, C. B. Key
Leaking Ammunition Storage Magazines
Collection of Facts:  The structures are corrugated steel, sections
designed to be constructed at grade level and covered with earth to resist
promulgation of exploding adjacent magazines in the event the contents of
one or more magazines were exploded.  The design was considered to be
economically feasible for construction in remote locations.  However, they
have never been absolutely water tight.  It was expected that some rain
water would perk through the soil cover and find it's way into the
magazines.  With the advent of new weapons and missiles that are water and
humidity sensitive, it was required that magazines be absolutely water
Solution:  A fluid applied elastomeric waterproofing system was applied to
the outer surface of the corrugated steel magazines. A protection fabric
was placed over the waterproofing membrane to preclude damage to the
membrane.  A six inch thick aggregate drainage course was placed over the
protection fabric.  This allowed water to drain down each side of the
barrel shaped structure and be collected by drain tiles parallel to each
side of the structure.  The drain tiles carried the water out through the
head wall to a storm drain.
CASE A2 - Roofing and Waterproofing, C. B. Key
Slippage of built-up roofing
Collection of Facts:  A built-up roofing membrane show signs of slippage.
This was evident by the appearance of breaks in the aggregate surfacing
parallel to the felts.  Slippage is caused by using a type of bitumen
having a softening point too low for the slope of the roof on which it is
used.  This roofing membrane was installed over roof insulation as are 90%
of all built-up roofs.  Since the slope did not exceed one inch per foot,
wood nailers for backnailing the felts were not provided.
Solution:  Aggregate was removed in lines approximately sixteen inches
wide, eight feet apart, parallel to the slope of the roof.  Nails were
driven through the roofing felts approximately twelve inches on center
down the center of each line where aggregate had been removed. Stripping
felts four inches and twelve inches respectively were installed in bitumen
over the nails up each line.  Bare areas were then flood coated with hot
bitumen and aggregate embedded.  The nails served as shear pins and
stopped the slippage of the felts.

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