Roof Membrane Uplift Resistance Testing

Your Ally in Roofing Compliance

Unlike a building’s interior components, roofs are susceptible to severe weathering, foot traffic, expansion, contraction and abuse, which can result in accelerated roof system degradation. To assure a roof system performs optimally and meets warranty compliance, roof membrane uplift resistance testing is the industry accepted international standard that:

  • Identifies installation and design deficiencies that could lead to premature degradation, catastrophic building damage on the interior and exterior and may even pose a danger to occupant safety.
  • Remaining life expectations
  • Provides security in knowing your installed asset complies with the designed wind speed.
  • Meets the manufacturer’s warranty requirements and the Texas Department of Insurance requirements.
  • Is a requirement of some insurance providers to determine the quality of an insured asset.

Z6 Commissioning Testing Capabilities

Z6 Commissioning, LLC (Z6) is one of the few companies in Texas who are ISO/IEC 17025 accredited in roof uplift test FM Global 1-52 and ASTM E907. As such, we are uniquely positioned to assure your roof meets all applicable building codes and insurance/warranty requirements.

Z6 set out to be the leader in roof uplift testing by building our own improved version of a typical testing chamber. Uplift testing used to be referred to as “bubble test” as it was often conducted with a high-strength skylight dome.  FM Global was on hand during our “maiden voyage” and was so impressed with our chamber design; they suggested we put the system on the market. Z6 Commissioning (Z6) built our roof uplift chamber with the mindset of eliminating the controversial “spiking” test pressures issue. We do this by showing the readings for pressure and deflection in a real-time computer generated graph during the test and on the report. Our custom roof uplift chamber, calibrated tooling and extensive protocols evaluate and record pressure and deflection measurements in real-time.

Performance Assurance

An Uplift Chamber Test is nondestructive on properly installed roofs and utilizes our custom 5’x5’ aluminum chamber that simulates wind uplift pressure by suctioning critical areas of the roof one pressure step at a time, up to 150% of design pressure, depending on the test method.

The following process shows how negative pressure testing is conducted using an uplift chamber:

Roof Asset Management

Step 1

Placing uplift chamber on a randomly selected critical area of the roof & obtain an airtight seal between the roof & chamber.
Roof Asset Management

Step 2

A 10-foot perimeter is established & isolated to restrict foot traffic.
Roof Asset Management

Step 3

A pre-established series of testing pressures is initiated with each pressure held for one minute until the test pressure is reached.
Roof Asset Management

Step 4

Multiple roof sections are tested at the required design pressure for the corresponding zone.

Roofs typically fail uplift testing for one of three reasons:

  1. Exceeding the allowable deflection,
  2. A sudden ballooning of the cover, or
  3. An actual blowout

Allowable deflection of the roof cover for a FM Global 1-52 test is ¼ – ½ inch (6-12.7mm) depending on the roofing substrate and the more generous ASTM E907 test allows for a 1 inch (25.4 mm) deflection. Considering that the allowable flex is so minute, especially for the FM Global test, Z6 has taken every effort to remove human error by investing in technology that gathers data digitally instead of relying on analog dials and manual recording of the data. Our digital system exceeds the accepted standard which allows deflection in roofing to be measured via dial indicators and visual inspection, which could result in recording errors and does not account for movement on the roof by the testing technician.  Z6’s digital indicators provide calibrated digital readings up to .001” while tracking and recording test pressures throughout the test.

Should an obvious failure occur, or if excessive deflection is recorded, per the standard, the section of the roof that failed must be carefully cut out to determine the cause of the failure.

Typical Issues Discovered:

  • Deficiencies in metal decking or fastener placement
  • Roof boards unable to resist pressures prescribed for the project
  • Various installation defects (i.e. insufficient or improperly installed adhesives)
  • Adhesive materials that were improperly stored or deviations from installation instructions with regards to temperature or cure time.
  • Inability of the system to withstand pressures prescribed by ASCE 7-10

Z6 can perform and record roof uplift tests in accordance with FM Loss Prevention Data Sheet 1-52 (FM 1-52) and/or ASTM E907, then provide a detailed accredited report of test results, including the digital read-out of continuous pressure during testing.

Call us today to schedule an uplift test on your new or replacement roof projects. If you suspect you have a breach in your existing roof, give us a call to have us mobilize on your behalf to perform an Electronic Leak Detection (ELD) test.

Click here for our eBook explaining the ELD process.