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Historical Warranty Repair Cost: A Measure Of Long-Term Roof System Performance

Learn how to measure and evaluate the long-term performance of roof systems using historical repair cost data. This study focuses on EPDM, APP, and SBS roofing systems installed from 1982 to present, with over 20,000 roofs and 2 billion square feet of surface area. Discover the importance of warranty data as a useful tool in assessing roof system performance.

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Historical Warranty Repair Cost: A Measure Of Long-Term Roof System Performance

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  1. Historical Warranty Repair Cost: A Measure Of Long-Term Roof System Performance James L. Hoff Firestone Building Products

  2. Roof System Performance: • Where To Measure • When To Measure • How To Measure • What To Measure

  3. Roof System Performance: Where To Measure • Laboratory • Field

  4. Roof System Performance: When To Measure • Short-Term versus Long-Term • One-Time versus Periodic

  5. Roof System Performance: How To Measure • Anecdotal Approach • Statistical Approach

  6. Roof System Performance: What To Measure • Frequency Of Incident • Economic Impact

  7. Roof System Performance: The Ideal Measure • Based On Field Observation • Long-Term Approach • Statistically Significant • Based On Economics

  8. Roof System Performance: The Warranty Data Base As A Useful Tool • In-Service Performance Information. • Long-Term Focus • Large, Statistically Significant Population • Cost-Based Measurement

  9. Roof System Performance: The Warranty Data Base Used In This Study: • EPDM, APP & SBS Roofing Systems • Installed From 1982 To Present • Over 20,000 Roofs / 2 Billion Square Feet

  10. Roof System Performance: The Warranty Data Base Used In This Study: • Detailed System Information • Detailed Service History

  11. Roof System Performance: The Warranty Data Base Can Be Used To Measure: • Frequency Of Roof Repair Service • Relative Repair Cost Over Time • Relative Repair Cost Of Different Systems & Components.

  12. Historical Repair Cost: Actual Spending Indexed To A Base Year Actual Spending During A Specified Service Year Cost / Square Meter/ Service Year Actual Spending Divided By Total Surface Area

  13. Repair Costs By Service Year: 1984 EPDM Roofs ( Indexed Cost Per Square Meter ) .689 .538 .509 .382 .366 .363 .325 .290 .224 .047 .031 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Year Maintenance Performed Year Service Performed

  14. Repair Costs By Service Year: 1985 EPDM Roofs ( Indexed Cost Per Square Meter ) .300 .292 .267 .243 .238 .217 .186 .182 .160 .054 .038 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Year Maintenance Performed Year Service Performed

  15. Repair Costs By Service Year: 1986 EPDM Roofs ( Indexed Cost Per Square Meter ) .234 .224 .169 .167 .159 .160 .153 .133 .116 .054 .011 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 Year Service Performed

  16. Repair Costs By Service Year: 1987 EPDM Roofs ( Indexed Cost Per Square Meter ) .130 .113 .115 .111 .112 .101 .099 .083 .076 .041 .017 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Year Service Performed Actual Projected

  17. Repair Costs By Service Year: 1988 EPDM Roofs ( Indexed Cost Per Square Meter ) .109 .098 .087 .086 .083 .074 .072 .066 .042 .028 .016 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Year Service Performed Actual Projected

  18. Repair Costs By Service Year: 1989 EPDM Roofs ( Indexed Cost Per Square Meter ) .099 .097 .087 .087 .073 .059 .059 .054 .042 .038 .017 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 Year Service Performed Actual Projected

  19. Repair Costs By Service Year: 1990 EPDM Roofs ( Indexed Cost Per Square Meter ) .092 .083 .078 .075 .066 .059 .050 .042 .031 .012 .005 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 Year Service Performed Actual Projected

  20. Repair Costs By Service Year: 1991 EPDM Roofs ( Indexed Cost Per Square Meter ) .066 .068 .059 .054 .050 .050 .042 .038 .040 .007 .000 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Year Service Performed Actual Projected

  21. Repair Costs By Service Year: 1984 - 1991 EPDM Roofs ( Indexed Cost Per Square Meter ) .700 .600 .500 .400 .300 .200 .100 .000 0 1 2 3 4 5 6 7 8 9 10 Year Of Service 1984 Roofs 1985 Roofs 1986 Roofs 1987 Roofs 1988 Roofs 1989 Roofs 1990 Roofs 1991 Roofs

  22. EPDM Roof Repair Costs: First Five Years Of Service ( Indexed Cost Per Square Meter ) 7.0 6.52 6.0 4.67 5.0 3.99 4.0 3.0 1987 Roofs = 1.00 2.10 2.0 1.44 1.00 0.75 0.72 1.0 0.65 0.52 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Roof Installed

  23. EPDM Actual / Projected Repair Costs: First Ten Years Of Service ( Indexed Cost Per Square Meter ) 7.0 6.5 6.0 5.2 Actual 5.0 Projected 3.8 4.0 1987 Roofs = 1.00 3.0 2.2 2.0 1.6 1.0 0.8 1.0 0.7 0.6 0.4 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Roof Warranted

  24. EPDM Repair Costs By System Type: • First Five Years Of Service • ( Indexed Cost Per Square Meter ) 16.0 14.0 12.0 10.0 1987 Average For All Systems = 1.00 8.0 6.0 4.0 2.0 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Roof Installed Ballasted Adhered Mech. Attached

  25. New / Re-Roof / Re-Cover: First Five Years Of Service ( Indexed Cost Per Square Meter ) 5.0 4.0 1987 Average For All Roofs = 1.00 3.0 2.0 1.0 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Roof Warranted New Construction Re-Roof Recover ( Tear-Off )

  26. EPDM Repair Costs By Component: First Five Years Of Service ( Indexed Cost Per Square Meter ) 4.0 3.5 3.0 2.5 2.0 1987 Total For All Components = 1.00 1.5 1.0 0.5 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Roof Warranted Seams Perimeters Other

  27. EPDM Roof System Performance Improvements To Component Technology: 1985 - 1986 1985 - 1986 1987 - 1988 1988 - 1991 1993 - Pres. Butyl-Based Splice Adhesive Uncured EPDM Flashings Tape Laminates Improved Perimeter Details Seam Tape & High-Solids Primer

  28. % Roofs With Call-Backs In First Two Years: 46% Lower 43% Lower 1993 1994 Year Roof Warranted Adhesive Seams Tape Seams

  29. EPDM Repair Costs • By Contractor Status: • First Five Years Of Service • ( Indexed Cost Per Square Meter ) 1987 Average For All Contractors = 1.00

  30. Modified Bitumen Repair Costs

  31. EPDM / Modified Bitumen Repair Costs: • First Five Years Of Service • ( Indexed Cost Per Square Meter ) 1.85 1.41 1.32 1.33 1.20 1.00 0.75 0.72 0.65 0.52 Year Roof Warranted

  32. APP / SBS Repair Costs • First Five Years Of Service • ( Indexed Cost Per Square Meter ) 1.99 1.85 1.85 1.41 1.20 1.19 1.19 Year Roof Warranted

  33. Roof System Performance: Modified Bitumen Repair Costs Systems In 1987 - 1991 Data Base Are Predominantly 1-Ply Systems. Repair Costs Are Predominantly Related To Seams.

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