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negative pressure Roof uplift testing

David Amori, PE, RRC. negative pressure Roof uplift testing. NEGATIVE PRESSURE TESTING. Description Using negative pressure to simulate and test resistance to wind induced uplift on a membrane roof system. Negative pressure test. Test Summary

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negative pressure Roof uplift testing

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  1. David Amori, PE, RRC negative pressure Roof uplift testing

  2. NEGATIVE PRESSURE TESTING

  3. Description • Using negative pressure to simulate and test resistance to wind induced uplift on a membrane roof system. Negative pressure test

  4. Test Summary • Test pressures are obtained from the structural engineer and/or governing agency. These usually include field, perimeter, and corner test pressures. • The apparatus is installed and pressure is gradually increased to the test pressure in 7.5 psf increments (held for one minute) while simultaneously recording the deflection of the membrane. • Failure is 0.25 to 0.94 of an inch deflection (FM) and one inch (ASTM). Negative pressure test

  5. NEGATIVE PRESSURE TESTING

  6. NEGATIVE PRESSURE TESTING

  7. Test Summary • Failure are typically cut open to make observations regarding the failure mode • Material Failure • Delamination • Fastener Pull • Substrate Failure Negative pressure test

  8. Application • Insurability for specific carriers • Factory Mutual • TWIA • Code Compliance • New Construction Design Compliance Negative pressure test

  9. Application • Risk Assessment – as part of the evaluation of a property this test is used to determine probable loss at incremental pressure (Hurricane Strengths). Negative pressure test

  10. Relevant Standards • ASTM E 907 – 96 (Reapproved 2004): Field Testing Uplift Resistance of Adhered Membrane Roofing Systems • FM Global 1-52: Field Uplift Tests Negative pressure test

  11. WIND

  12. WIND ~ 25 psf 25 psf

  13. WIND For roof slope < 7 degrees 45 psf 70 psf 25 psf 25 psf

  14. WIND

  15. After the storm

  16. wind DAMAGE DELAMINATION

  17. wind DAMAGE DELAMINATION

  18. wind DAMAGE DELAMINATION

  19. wind DAMAGE DELAMINATION

  20. wind DAMAGE fastener failure

  21. wind DAMAGE fastener failure

  22. Before the storm

  23. NEGATIVE PRESSURE TESTING

  24. NEGATIVE PRESSURE TESTING FASNTERS RESISTING PRESSURE FASNTERS RESISTING PRESSURE

  25. FAILURE ANALYSIS - MATERIAL FAILURE MATERIAL DELAMINATION

  26. FAILURE ANALYSIS – CONSTRUCTION DEFECT LACK OF TORCH

  27. ROOF UPLIFT TESTING

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