]3.2.3.2
Priming of Metal Surfaces
Prime flanges of metal components to be embedded into the roofing system
prior to setting in bituminous materials or stripping into roofing system.
3.2.4
Covering of Wood Substrate
Cover wood substrate with a layer of unsaturated felt or rosin-sized
building paper lapped 50 mm (2 inches) at sides and 100 mm (4 inches) at
ends. Nail to hold in place prior to application of roofing system.
3.2.5
Heating of Asphalt
Break up solid asphalt on a surface free of dirt and debris. Heat asphalt
in kettle designed to prevent contact of flame with surfaces in contact
with the asphalt. Kettles shall have visible working thermometer and
thermostatic controls set to the temperature limits specified herein. Keep
controls in working order and calibrated. Use immersion thermometer,
accurate within a tolerance of plus or minus one degree C (2 degrees F), to
check temperatures of the asphalt frequently. When temperatures exceed
maximums specified, remove asphalt from the site. Do no permit cutting
back, adulterating, or fluxing of asphalt.
3.2.5.1
Temperature Limitations for Asphalt
Heat and apply asphalt at the temperatures specified below unless specified
otherwise by manufacturer's printed application instructions. Use
thermometer to check temperature during heating and application. Have
kettle attended constantly during heating process to ensure specified
temperatures are maintained. Do not heat asphalt above its finished
blowing temperature (FBT). Do not heat asphalt between 260 and 274 degrees
C (500 and 525 degrees F) for longer than four consecutive hours. Do not
heat asphalt to the flash point (FP). Apply asphalt and embed membrane
sheets when temperature of asphalt is within plus or minus 14 degrees C (25
degrees F) of the equiviscous temperature (EVT). Before heating and
application of asphalt refer to the asphalt manufacturer's label or bill of
lading for FP, FBT, and EVT of the asphalt used.
3.3
APPLICATION
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NOTE: Include requirements for temporary roofing
and flashing when construction will require
considerable work on roof (that is, installing
cooling towers, antennas, pipes, ducts, solar
collectors) and temporary roofing is considered
necessary to ensure that permanent roofing is not
damaged during construction.
**************************************************************************
Apply roofing materials as specified unless approved otherwise by the
Contracting Officer. Keep roofing materials dry before and during
application. Except for aggregate surfacing, complete application of
roofing in a continuous operation. Begin and apply only as much roofing in
one day as can be completed that same day. Maintain specified temperature
for asphalt. [Provide temporary roofing and flashing as specified herein
prior to application of permanent roofing system.] Do not apply aggregate
surfacing until the other roofing application procedures specified herein
are completed.
SECTION 07511
Page 22
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