FM GLOBAL 1-52 ASTM E 907 SIMULATING WIND UPLIFT PRESSURE TO VERIFY RESISTANCE OF LOW-SLOPE MEMBRANE ROOFS.

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Presentation transcript:

FM GLOBAL 1-52 ASTM E 907 SIMULATING WIND UPLIFT PRESSURE TO VERIFY RESISTANCE OF LOW-SLOPE MEMBRANE ROOFS

WIND ACTS A FLUID FLOWING OVER AND AROUND STANTIONARY OBJECTS

25 psf ~ 25 psf WIND CAUSES A POSITIVE PRESSURE ON THE WINDWARD SIDE OF THE OBJECT AND CAN CAUSE A NEGATIVE (UPWARD) PRESSURE ON THE ROOF

Poor Adhesion Between Deck and Insulation Poor Adhesion Between Insulation and Cover Board Poor Adhesion Between Cover Board and Membrane

Poor Adhesion Between Insulation and Membrane

5’ SQ Chamber Imposes an Uplift Force on the Membrane Pressure is Incrementally Increased to the Design Test Pressure Deflection of the Membrane is Measured and Compared to Performance Criteria

Fastener holding adequately at test pressure

 Application  Acceptance of new (including re-roofed and re-covered) above-deck roofing assemblies by FM Global…in regions that are both prone to hurricanes, typhoons or tropical cyclones and where design wind speeds are at least 100 mph (FM 1-52).  Field verification of adhesion of low-slope roof for the issuance of a certificate of insurability. For example WPI-8 for the Texas Department of Insurance (TDI).

 Application  Risk Assessment – as part of the evaluation of a property this test could be used to determine probable loss at incremental pressure (Hurricane Strengths).

Rack Calibrated to Deliver 5 gal / sf / hr

Pressure Differential Imposed Across System

Water Infiltration

The Forensic Version of the Test Allows For Isolation of Various Components to Determine Mode of Failure.

IR Images During Test Help Indentify Path of Water Intrusion

Remove Finish Materials

Document MC of Framing

Run Component Isolating Water Test to Determine Mode of Failure