A Method to Detect and Locate Roof Leaks Using Conductive ... · Membrane monitoring –After...
Transcript of A Method to Detect and Locate Roof Leaks Using Conductive ... · Membrane monitoring –After...
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A Method to Detect and Locate Roof Leaks
Using Conductive Tapes
David Vokey, P.Eng.Detec Systems, LLC
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A Technology Based Quality Assurance Program
for Waterproof Membranes
Quality Assurance
Testing and monitoring processes that minimize the risk of
installation deficiencies and assist in reducing lifecycle costs.
Quality Control
Membrane scanning – During construction, quickly identify and
correct membrane application deficiencies
Membrane monitoring – After construction, detect and locate for
repair any membrane breaches before they become costly
problems
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Roof Inspection and Testing
Managing the potential causes of roof failures:
Certified on-site roof inspections
Flood testing
Electronic surveys and continuous monitoring
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Looking For An Alternative to Flood Testing?
CRCA & NRCA does not recommend conducting flood tests as
part of a routine quality-control or quality-assurance program
“Flood testing also is not appropriate for identifying potential leak
sources
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Forensic Leak Locating Technologies
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Infrared Moisture Survey
Dielectric Test Survey
Electric Gradient Leak Locate (a.k.a EFVM)
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Conductance Testing, Monitoring and Leak Locating
Roof Membrane Integrity Scan
Vertical Surface Leak Locating
Waterproof Membrane Monitoring
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Detection Tape Installed on Top of Membrane (Wet Side)
Monitoring grid placed on top of waterproof membrane
Electric potential applied between grid conductors and deck
Current leakage to ground through membrane breach peaks
at adjacent grid conductors
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Installing X & Y Monitoring Grid
using Peel & Stick Conductor Tape
Conductor
Grid
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Connecting Grid to Monitoring System
Switching and measuring unit
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Make a Hole In The Membrane
Switching and measuring unit
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Perform Measurement Scan
Switching and measuring unit
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Localizing Leak to Grid Section
Switching and measuring unit
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Initial Field Trial on Waterproof Membrane
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RCABC TEST SITE
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Test Equipment Set Up
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Leakage Current Density Near Damage Site
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Leak Locate Grid Installed in Green Roof
WaterproofMembrane Leak Locate Tape
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Leak Locate Tape Installed on Waterproof Membrane
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Completed Intensive Green Roof
with Integrated Leak Locate Grid
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Beacon Hill Reservoir Seattle
270,00 sq ft., 53 million gallons
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QC Process – Scan Membrane for Damage
IntegriScan™
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QC Process - Repair and Retest
Membrane Breaches
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Installing Conductor Tape Monitoring Grid
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Installed Grid Monitoring System
LeakLocate Array™
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Commissioning Membrane Monitoring System
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YMCA Patina – Vancouver 16,700 sq. ft.
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Southern Alberta Institute Of Technology
135,000 sq. ft. playing field
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City Creek - Salt Lake City
Green Roofs, Water Features,
Plaza Decks
250,000 sq. ft. phase 1& 2
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Nintendo of AmericaNintendo Building Seattle – 93,000 sq. ft.
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Palomar Medical Center, CA – 165,000 sq.ft.
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Amazon Buildings Seattle
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West Seattle Reservoir – 203,400 sq.ft.
50-million-gallon reservoir
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West Seattle 50M Gallon Reservoir
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Conclusions
Quality control testing during membrane application
with corrective feedback
Early detection and location of membrane damage
under a green roof, wear-course or topping slab
Risk mitigation for warranty programs
Support sustainable development by avoiding
premature roof failure and associated costs
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THANK YOU FOR YOUR INTEREST
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