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What Can Go Wrong

With Commercial Roof System Installations

Asphalt Temperatures

Figure I illustrates the diminishing lifecycle of roofing membrane manufactured at temperatures above and below manufacturer's recommendations.

In addition to chemical changes that can later cause blistering within the membrane, the asphalts ability to adequately penetrate membrane pores is significantly reduced.

On a Built-Up Roof (BUR), the adhestion of asphalt and the interply felts is the main waterproofing components of the overall roof system.

Adhesion Imperfections

Most imperfections in the adhesion layers occur during the manufacturing process. This is work performed on the roof during installation of the roof system. And, they are not limited to the Built-Up Roof (BUR) systems (illustrated). Each of the fifteen types of commercial roof systems have their own characteristics that should be monitored.

Material handling failures could appear immediately or may not be discovery until the service warranty has expired. Most NDL warranties do not cover repairs and we have seem some labor contracts attempt to avoid warranty coverage.

These types of failures are associated with increased maintenance and repair cost until the roof system is replaced. They may also impact maintenance requirements after a resurfacing because the underlying waterproof system is unstable.

Inappropriate Flashings

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Seamingly less important to roofers, many flashings can be a constant maintenance item on a commercial roof system.

Roofers will bid and install less expensive flashings or as in the case with Planned Parenthood, they will not complete the installation. The price difference is betwen $20.00 & $30.00 per flashing but the impact to your annual budget is around $500.00 per recurring repair. Expect four repairs events over the life of your roof and the total cost is $2,000.00 or more.

Sample Failures

These are three of the most common roofing failures found on Built-Up Roof (BUR) Systems. As mentioned above, there are fifteen types of commercial roof systems - each with their own characteristics and prerequisite requirements to meet what traditional businesses follow in ISO 9000 processes.
 
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1361 Winchester Blvd, Suite 207
San Jose, CA 95128
(408) 871-9296 • (408) 871-9295 fax
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