[A-Silicone
0.25 mm
0.13 mm
0.25 mm
0.64 mm
(10 mils)
(5 mils)
(10 mils)
(25 mils)]
[B-Silicone
0.25 mm
0.13 mm
0.25 mm
0.64 mm
(10 mils)
(5 mils)
(10 mils)
(25 mils)]
[CB-Urethane
0.25 mm
0.25 mm
[0.25 mm]
0.75 mm
(10 mils)
(10 mils)
[(10 mils)]
(30 mils)]
[CF-Urethane
-
[0.25][0.38] mm [0.75][0.88] mm
[10][15] mils
([30][35]) mils]
3.8.5
Granule Surfacing
**************************************************************************
NOTE: Mineral granules may be embedded in wet
finish coat of silicone coatings. Mineral granule
surfacing is generally not required with urethane
coating but can be used if desired. Granules are
used to:
1. Improve impact resistance to foot traffic,
dropped tools, bird pecking, etc.;
2.
Improve fire resistance;
3. Improve appearance.
**************************************************************************
Spray-apply mineral granules to finish coat, coating within 2 to 5 minutes
after application of finish coating, depending on temperature and humidity,
as required by roof coating manufacturer's printed installation
instructions. Spray applicator equipment shall be a sand blaster with
output pressure reduced to 69 to 138 kPa (10 to 20 psi). Apply granules to
surface evenly at a rate of 25 kg per 10 square meters (50 pounds per 100
square feet).[ Granules shall provide full coverage of the roof surface.][
Bare spots shall be covered by applying additional finish coat and
granules.] Do not allow traffic on finished areas for minimum 24 hours
after granule application is completed.
3.8.6
Penetrations
Apply an additional 0.25 mm (10 mil) finish coat for one meter (3 feet) all
around roof access locations and 0.75 meters (2 feet) around all
penetrations. Double the specified coating system thickness at all drain
sumps, applied in maximum 0.38 mm (15 mil) thickness per coat.
3.8.7
Walkways
**************************************************************************
NOTE: Walkways should be specified whenever heavy
foot traffic on the roof is expected.
**************************************************************************
Provide reinforced[ walkways][ walkpads] where indicated. Traffic paths
shall consist of[ additional application of finish coat and granules over
first layer of granules and finish coat][ a layer of reinforcing fabric
laid smooth into and fully overcoated with an additional finish coat to
SECTION 07570
Page 35
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