Parking Structure Crew Beats the Heat
By polycoat | Saturday, February 23, 2013, 05:49
Nash was under pressure to complete the rooftop parking
structure at Saddleback Memorial Medical
Center during one of Southern
California's hottest and longest-lasting heat waves. Did they beat
the heat and get the job done. Saddleback
Center is a world-class medical center
located in southern Orange County,
California. Saddleback was
recently named one of the top 100 hospitals in the United
States by Thomas Reuters, an independent health research
organization, and is ranked Best
Hospital in several
medical specialties by U.S. News & World Report. But according to John the
heat wave brought unseasonably high temperatures for weeks on the end. Nash of
Nash Deck Coatings, the three-level parking structure at the medical center was
no living up to expectations.
"There was sever peeling and flecking of the existing
top coat on the access ramps and roof deck of the parking structure," explains Nash."
It seems like an inferior product was put down very thin on the deck, and it
was peeling pretty badly."
Something needed to be done to the 15,000-square -foot
access ramp and roof deck area to restore safe and functional parking. This is
where Polycoat Products' Polyprime Uand Poly-I-Gard 246SC came
into the picture.
HOT TIRES, GOOEY MESS
A peeling top coat was not the only issue with the roof
deck. Send had not been broadcast into the existing coating system, making the
deck extremely slippery when wet.
"When it rained,
cars and people would go skidding and sliding around," Nash says. ,"
In addition, the hot tires of the cars that drove up the access ramps and onto
the roof deck took the material with them, leaving a peeling and slippery mess.
To make sure everyone remained safe, the top level of the parking structure had
to be closed whenever it rained."
Center staff felt it
necessary during inclement weather to close the roof of the parking structure
to ensure patient and visitor safety, they realized doing so was not an
Nash performed a number of adhesion tests to make sure that
the Polyprime U and Poly-I-Grad 246 SC would properly adhere to the existing urethane
base coat. "If we had adhesion tested it and the primer lifted, we would
have had a problem," says Nash. "But that was definitely not the case with
the saddleback project."
Since the polycoat products coatings passed
the adhesion tests by adhering to the existing urethane base coat, it was
determined that only the top coat needed to be completely removed the base coat
could remain on the concrete substrate - thus saving the client a great deal of
money and time.
"At that point in time, we were ready to apply Polyprime U
directly to the existing base coat," says Nash
Adriaan van der capellen, southern California sales manager for polycoat,
agrees that Polyprime U was the right choice for the job.
"Polyprime U is
an intercoat adhesion primer for existing urethane systems," explains van
der capellen. "It really takes a hold of and bites in to the existing urethane."
According to Nash during the late summer and early fall of
2012 there were many days temperatures soared to above 100 F (37.78 C) in
southern Orange County, California, which is quite an unusual
"It was 109 F (42.78C) outside, and the temperature would be
even higher on the roof deck, " says Nash. " It was ridiculously
hot." It was decided that postponing the job might be the best option. By
the end of the two week period, Nash and his crew were eager to get started on
the job, not to mention eager for the weather in southern California to return to normal. With no end
the heat wave in sight, Nash had to pull the trigger.
"We had to go in on the third week regardless of the
heat wave," Nash says. "The job had to get done!"
After making the decision to go ahead with the job. Nash and
his five man crew began the surface preparation. The entire roof deck area and
all access ramps were power washed using a power washer.
"We power -washed the deck on the Sunday before we
started surface prop and coatings," says Nash. He and his crew needed to be
finished with the job within five working days, so they took advantage of the
slower vehicular and pedestrian traffic on the weekend to get a jump on the
first step of the process.
"Since the hospital never closes, the parking structure
needed to remain open," Nash says. "The two lower levels were open even while
we were doing work on the roof.
Once the deck was power-washed, the crew got down to the
business of removing the existing top coat using a grinder. The deck was
divided into three sections and each section was preppes, repaired (if
necessary), primed, and coated before moving onto the next section.
very last section was into he worst condition", says Nash." It was the largest
section and had the most traffic come across it, so it makes sense that it was
the most damaged".
the sections, the crew made concrete repairs as necessary before moving on to
priming and coating. Depending on the severity of the cracks, the crew used
gun-grade urethane, embeded carbon fiber tape, and/or caulking to bridge the
With surface prep and repairs made, the crew was ready to
apply the Polyprime U.Using squeegees and rollers, the Nash Deck crew applied
the high-solids primer to the roof deck at 3 mils (76.2 microns), DFT. Under
typical circumstances, Polyprime U should be coated within 12 hours after it
has becomes tack-free; however, because of the extreme heat, the primer cured
"We were able to apply the Poly-I-Gard 246SC within three hours
after we laid down the primer," Nash explains.
–I-Gard 246sc is a single component ,moisture- cured, aromatic polyurethane waterproofing
membrane.Poly-I-Gard 246SC is designed for use in Southern California to meet
the region's low volatile organic compound (voc) requirements.These
requirements are set forth and regulated by the South Coast Air Quality
Management District (SCAQMD),which encompasses most of Los Angles, an
Bernardino ,Riverside, and all of Orange
Counties. The SCAQMD regulates all sources of stationary sir pollution for the
The crew poured and rolled the
Poly-I-Gard 246SC at a thickness of approximately 10 mils (254 microns).Nash credits
the Polycoat materials for performing incredibly well under unusual
"I was a little worried about gassing because of the high
temperatures," Nash says." It wasn't a problem with the polycoat Products
coatings. There were no
bubbles and no gassing." Nash did, however, make some
adjustments. Both the Polyprime U and the Poly-I-GARD 246SC are sensitive to heat,
so Nash was very careful with batch sizes, especially the primer." I mixed the
two-part Polyprime U primer in half batches-we mixed two-and-a-half gallons,
sometimes less, at a time instead of the usual five gallons." Nash says.
NO DAY AT THE BEACH!
Working feverishly, the Nash Deck crew broadcast Cemex-brand
Lapis Luster 2/16 sand onto the wet coating.
"We needed to have a fairly aggressive non-skid
component added to the coating system," says Nash. In the highest traffic areas,
there was adouble broadcast, ensuring excellent non-skid properties. Two final
coats of 10 mils (254 microns), DFT, of Poly-I-Gard 246sc were then laid on the
entire deck area. In the areas of highest vehicular traffic, the coating
systems has a thickness of over 40 mils (1016 microns) that protects the
existing urethane base coat and underlying concrete substrate. The non-skid component
of the system ensures that cars and pedestrians do not slip and slide in wet
"We finished on Friday and the stripers came in on Monday,"Nash
says." The roof deck of the parking structure was open to pedestrains and
vehicles on Tuesday." Throughout the project, Nash and his crew followed all
standard safety procedures.
THEY BEAT THE HEAT
Polycoat Products made a great work on this parking
structure roof. Polycoat's Vander Capellen is extremely happy with the outcome
of the job.
Nash is quick to point out he is impressed with the coatings
and his crew.
"I've been doing this a long time -25 years -and I am
really happy with the way the Poly-I-Gard 246SC performs," says Nash. Although
this was Nash Deck Coatings first job for Saddleback Memorial
with the way his crew beat the heat to recoat and reopen the parking structure,
Nash bets it will not be the LAST!