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18553 Arrowhead Boulevard, San Bernardino, California 92407

Project Description

The existing industrial roof system comprised of plywood roof deck and multi-ply, built-up roofing (BUR) with granular-surfaced cap sheet. The entire roof was coating with a Western Colloid Commercial Roofing System that consist of asphalt emulsion, polyester reinforcement, and elastormeric acrylic coating.

Project Details

Ontario, California
74,400 Square Feet
July 2019


Maury Microwave installed the Western Colloid commercial roofing system about 15 years ago. Over the past several years, they started to experience leaks at several areas of the building. Since the building was fairly large (74,400 square feet), it was becoming increasingly more challenging to repair the leaks towards the center of the roof. The center of the roof housed the HVAC split system units that conditioned the air for the building occupants.

Other Contractor’s Recommendations

Maury Microwave contacted several roofing contractors to assess their roof condition and provide recommendations on how to address their roof issues. Other roofing contractors provide roofing solutions such as:

  • Tear-off and Torch Down: Tear-off the existing roofing system down to the roof deck and torch a new capsheet roof membrane to the roof deck. This roofing application is extremely labor intensive and requires a lot of trash and debris to be hauled off the roof. This system could have cost the building owner anywhere from $5.00-$7.00 per square feet.
  • Install a thermoplastic polyolefin (TPO) Single Ply Overlay Roof Membrane: A TPO single ply system requires applying polyiso rigid foam board on the existing roof, mechanically fastening the TPO membrane and welding the TPO seams to complete the system installation. The benefit to TPO roofing systems are that tear-offs are not require, however, once the TPO system serves out its useful life, another TPO system would not be allowed to be added on top of the existing. At that point, a tear-off of the TPO membrane would be required. Furthermore, when TPO roof membranes fail, they have been known to be extremely challenging to fix. This is mainly due to the fact that TPO roofing systems are mechanically fasten and welded on the seams. Other systems that are easier to maintain are fully adhered systems because the leak spotted inside the building typically are compromised directly above on the roof. This system could have cost the building owner anywhere from $5.00-$8.00 per square feet.
  • Spray Polyurethane Foam (SPF): A Spray Polyurethane Foam (SPF), or Foam Roof is a foam roofing system that goes on top of the existing roofing membrane. The benefits of spray foam roofing systems are that they are extremely light weight (roughly 2-3 pounds for every cubic feet) and well insulated systems. However, just like any roofing systems, there are drawbacks. It is extremely challenging to apply spray foam onto a roof with consistently. Meaning, when foam is sprayed, it expands significantly. As the roofing applicator, it is challenging to gauge the amount needed to apply to keep the original roof slope. When spray foam is installed on a roof, it typically leads to two things:
    1. An altering in the original slope design of the roof
    2. Creating puddles and ponding water on the roof
  • Furthermore, SPF roofing systems are typically applied on the existing roof membrane at 1-3 inches in thickness. When SPF roofing systems fail, it makes it incredibly difficult to maintain which will require the building owner at that time to decide to tear-off the existing roofing system and install a new system. This system could have cost the building owner anywhere from $2.00-$4.00 per square feet.

HP Roofing Pro’s Recommendation

The roof at Maury Microwave was an acrylic system that consist of asphalt emulsion embedded in a ply of polyester reinforcement and topped off with elastomeric acrylic. Furthermore, HP Roofing Pro saw that the acrylic was getting a little thin where the ply of polyester was started to surface, but the asphalt emulsion and polyester beneath the acrylic was still well intact.

HP Roofing Pro asked Maury Microwave if they had any information regarding their roof and they found a roofing certificate from Western Colloid stating the roofing system was installed about 15 years ago.

After compiling all that information, HP Roofing Pro recommended to recoat the roof with Western Colloid. All they needed to do was to recoat their existing roofing system with 3 more gallons of acrylic and they would be given an additional 10 year warranty by the manufacturer, Western Colloid.

This was a significant cost saving option for Maury Microwave as it was over half the cost over any other options that other contractors suggested. As a result, HP Roofing Pro saved the client tens of thousands of dollars, and addressed their roofing needs.


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