foam successfully encapsulated the outer perimeter
over the wood blocking and
onto the refastened EPDM
The WTI crew wore PPE
consisting of Tyvek suits,
gloves, boots, and bat-tery-powered, fresh-air-supply belt-pack respirators.
For added safety while working around the edges of the roof,
crewmembers wore harnesses and tied off to anchors that were
installed at the center of the roof.
Once the primer flashed off, the W TI crew used a Graco Probler P2 gun to apply the base coat, which was silver Oak Ridge
ORSLM Pure Polyurea at a minimum thickness of 1.5 gallons per square. The crew first applied the polyurea to all seams
twice followed by an overlay to the entire substrate. During
the polyurea application, the WTI crew divided itself to begin
the silicone topcoat application so that one part of the crew
focused on completing the polyurea application and the others
followed immediately with the topcoat. The topcoat consisted
of the installation of 18 dry mils of Oak Ridge’s 78 percent
The W TI crew
primed the flat
surface of the
roof and installed
prior to the coatings
Spray foam was
applied to the
perimeter of the
roof to eliminate
shrinkage of the
solid, single-component White Silicone coating. The two-coat
application totaled approximately a 48-mil dry film thickness.
“We started applying the top coat on the East side of the roof
because we witnessed intermittent wind coming in from the
West,” said Ezard. “We didn’t want to chance any silicone overspray onto the uncoated rubber before the polyurea was applied.
We witnessed very little down time by applying the roofing system in this manner.”
It took the WTI crew almost three weeks to complete the entire application, which was well received by the operators who
are now worry-free when it comes time to renew their lease.
Ezard pointed out that the Oak Ridge coatings constituting