Project Profile: Hotel

Project Name

Los Angeles, CA

Existing Roof System

Mineral surfaced fiberglass cap sheet
Built-up roof system

Products Used

System Used


The existing roof at a popular hotel in Los Angeles was made of Steel Deck with lightweight concrete. Existing roof system was a slag rock embedded in coal tar pitch built-up system. Many of the leaks were caused by blisters and ridging in the built-up roof. Rock was washed into the drain areas exposing coal tar built-up sheets. The exposed coal tar was becoming brittle and cracking due to sun exposure.

APOC recommended that the A/C curbs be raised to create proper clearance from the roof deck. Customer also agreed to install new sheet metal pans on top of the A/C curbs before they were reset. Filled existing pitch pans with APOC #502 and #501 Neoprene to ensure there was no cracking due to possible movement.

“Another successful project with APOC. The APOC technical team was on the project every day.”

AM2-FG-MF-PE-252 Power washed existing roof after the slag rock was power vacuumed off the roof. Applied flood coat of APOC #300 asphalt emulsion over existing roof system at 9-12 g/100 sq.ft. Flood coat helps level roof where rock is not completely removed. After flood coat cures applied Monoform, 9 gal emulsion + 3 lbs chopped glass per 100 sq.ft. Let cure. Applied two layers of 40” polyester mesh, each layer set in 4 gal of APOC #300 asphalt emulsion, allowed to cure. Applied APOC #252 Sun White Acrylic coating at 3 gal/100 sq. ft. Coating applied in 2 passes at 1 1⁄2 gal per pass. Base coat was grey, top coat was white.

Since the building was 14 stories in the air there was not a lot of access to the roof. The APOC restoration system is perfect for this type of job because the product can be pumped from the ground up to the roof without having to crane or carry anything up top. There was no down time which allowed the hotel to operate under normal everyday conditions. Taking the rock off the roof and applying APOC #252 Sunwhite Acrylic cooled the surface temperature of the roof 60 degrees.


  • High reflectivity rate
  • Protective barrier
  • Long service life
  • Resists algae, easy cleaning