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Preventative Maintenance


  • Poor, inconsistent weld
  • Seam voids
  • Fastener placement
  • Fasteners too long, or too short
  • Unadhered membrane
  • Unadhered base flashing
  • Contaminated roof substrate
  • Flashing displacement
  • Abuse of installed roof


  • Conduct test welds; probe all seams
  • Don’t start and stop welding excessively
  • Adjust screw gun clutch setting
  • Ensure fastener engages deck, in top flange
  • Use correct adhesives at right rate and temp
  • Use initial priming, 2nd adhesive application
  • Use broom or blower prior to installation
  • Follow fastener placement guidelines
  • Protect membrane; use job sequencing

“As long as the cost of maintenance is less than 1.6%of the initial cost of the project, the cost of the maintained roof-on an annual basis-will be less than the
un-maintained roof.”

Peter Kalinger, Technical Director,
Canadian Roofing Contractors Association

The choice not to have a maintenance program can cost an owner as much as $0.15 per sqft, per year.

Based on this estimate, the owner will be losing appx $33,000 per year.

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