SIMULATING THREE YEARS OF ROOFING MATERIAL WEATHERING IN A MERE THREE DAYS. July 19, 2016 Sarah Schneider Cool Roof Rating Council

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1 SIMULATING THREE YEARS OF ROOFING MATERIAL WEATHERING IN A MERE THREE DAYS Sarah Schneider Cool Roof Rating Council 1

2 OVERVIEW Cool Roof Rating Council Background Laboratory Aging Practice Development & Process CRRC Rapid Ratings Program Implications for Industry 2

3 INTRODUCTION TO COOL ROOF RATING COUNCIL (CRRC) 3

4 CRRC OVERVIEW Established in 1998, 501(c)(3) Third-party product rating organization for the roofing industry ANSI Accredited Standards Developer ISO Accreditation ENERGY STAR Certification Body Certificate

5 CRRC MISSION Ratings Research Education 5

6 RATIONALE By pursuing this mission, the CRRC will become the recognized informational resource for: Increasing building energy efficiency Improving occupant comfort Reducing the urban heat island effect Mitigating the effects of global warming 6

7 DEFINING A COOL ROOF 7

8 ROOFING PRODUCT RATINGS 8

9 PRODUCT AGING Ohio cool/temperate Arizona hot/dry Florida hot/humid 9

10 AGED PRODUCTS 10

11 WHAT IS LABORATORY AGING? Laboratory simulation of soiling and weathering Reproduces results of the natural aging process in an accelerated timeframe Relies on a defined soiling mixture for specific climate zones and use of an ultraviolet weathering apparatus 11

12 IMPETUS FOR LABORATORY AGING Assists in prototyping of products as reduces wait time for aged radiative performance results More accurate estimates of aged performance Can be used for code compliance 12

13 LABORATORY AGING PRACTICE 13

14 DEVELOPMENT PROCESS Led by Lawrence Berkeley National Laboratory (LBNL) and Concordia University researchers Compared CRRC and ENERGY STAR aged data to calculated aged values by product type and climate Research informed development and study of lab aging method Interlaboratory study conducted Approved as ASTM standard practice (ASTM D7897) in

15 LAB AGING PROCESS 15

16 SOILING APPARATUS Spraying nozzle psi Dry Air Soiling mix Spraying vessel Coupons of roofing products 16

17 UV EXPOSURE 17

18 SPRAY TANK & SETUP 18

19 SOILING MIXTURE 19

20 MIXTURE INGREDIENTS Component Dust Dust Dust Salts Salts Salt POM Soot Chemical Fe 2 O 3 (iron(iii) oxide powder) Montmorillonite Hydrophilic bentonite nanoclay NaCl (sodium chloride) anhydrous, free-flowing NaNO 3 (sodium nitrate) CaSO 4 2H 2 0 (calcium sulfate dihydrate) Humic acid Aqueous carbon black suspension 20

21 MIXTURE COMPOSITION Soot Dust Salt POM Hot/Dry 1% 79% 20% 0% Hot/Humid 8% 16% 7% 69% Cold/Temperate 8% 61% 31% 0% U.S. Average 5% 47% 20% 28% 21

22 SPRAY & CONDITIONING 22

23 CRRC RAPID RATINGS PROGRAM 23

24 RAPID RATINGS PROGRAM Adopted by CRRC 2014 Launched 2015 Refinement

25 RAPID RATINGS Optional rating process In addition to three-year weathering Rapid Ratings posted on CRRC Directory and product labels Three-year aged values replace Rapid Ratings Allowed for Title 24 compliance 25

26 RAPID RATING LABS Three laboratories authorized to perform lab aging practice for Rapid Ratings Program Accredited to ISO List ASTM D7897 on scope of accreditation Attend CRRC Rapid Ratings lab training In-depth, hands-on training by researchers who developed lab aging practice 26

27 IMPLICATIONS FOR INDUSTRY 27

28 INDUSTRY MILESTONE Addresses three-year delay between initial and aged ratings More accurate estimate of aged performance Assists in prototyping of new products Pathway to code compliance (e.g., Title 24) 28

29 FUTURE? Can be adapted to help predict product performance in more climates More collected test data to reduce uncertainty May be accepted by more codes and voluntary programs (ENERGY STAR?) 29

30 REFERENCES ANSI/CRRC S Standard Test Methods for Determining Radiative Properties of Materials. ASTM D Standard Practice for Laboratory Soiling and Weathering of Roofing Materials to Simulate Effects of Natural Exposure on Solar Reflectance and Thermal Emittance. Cool Roof Rating Council CRRC-1 Product Rating Program Manual. Sleiman et al Soiling of building envelope surfaces and its effect on solar reflectance Part 1: analysis of roofing product databases. Solar Energy Materials & Solar Cells. 95 (2011) Sleiman et al Soiling of building envelope surfaces and its effect on solar reflectance Part II: development of an accelerated aging method for roofing materials. Solar Energy Materials & Solar Cells. 122 (2014) Sleiman et al Soiling of building envelope surfaces and its effect on solar reflectance Part III: Interlaboratory study of an accelerated aging method for roofing materials. Solar Energy Materials & Solar Cells. 142 (2015)

31 QUESTIONS? Sarah Schneider Deputy Director x202 31