Best Practices in Roof Design: Sustainable Energy Efficient Reroofing

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1 Best Practices in Roof Design: Sustainable Energy Efficient Reroofing

2 Best Practice Roof Design: Sustainable Energy Efficient Reroofing Presented by Edis Oliver, PE Principal 9511 Lake Creek Parkway Austin, Texas Solutions for the Built World 2

3 Goals for the Program Learn what is an energy efficient roof. Learn what is a sustainable roof. Learn the problems in roof replacement. Learn where the energy money resides. Solutions for the Built World 3

4 Sustainable Roof Definition A sustainable roof is that which: Has the longest trouble-free service life. Has the lowest life cycle cost. Produces the greatest energy saving. Best serves as a platform for other requirements. Solutions for the Built World 4

5 Requirements for Sustainability Sound roof drainage design. Proper wind resistant construction. Proper energy efficiency. Proper installation of all roof components Regular inspection and maintenance. Solutions for the Built World 5

6 Common Low Slope Roofs Multi-ply bituminous Asphalt based Asphalt built-up with gravel surface Modified bitumen Single-ply chemical Ethylene propylene diene monomer (EPDM) Polyvinyl chloride (PVC) Thermoplastic olefin (TPO) Solutions for the Built World 6

7 Roof Terminology Low slope roof = Less than 3:12 pitch Steep slope roof = Greater than 3:12 Should be no such thing as a Flat roof Solutions for the Built World 7

8 2009 IECC Requires R-22 Roof Insulation Solutions for the Built World 8

9 Mopping plies in hot asphalt Solutions for the Built World 9

10 Torching Energy Star Cap Sheet Solutions for the Built World 10

11 Applying with Cold Adhesive Solutions for the Built World 11

12 Ballasted EPDM Reroof Solutions for the Built World 12

13 TPO with Heat Welded Seams Solutions for the Built World 13

14 Three Main Problems with Reroofing. Code compliance by contractors. Slope and drainage Wind resistant design Energy code compliance Recovered roofs vs. complete removal. Over-reliance on cool roof (white) concept.

15 Proper Modified Bitumen Roof System Fully adhered roof membrane. 2 Layers of insulation with joints staggered. Solutions for the Built World Fastener through bottom layer only. Fastener through top deck flange.

16 Typical Single Ply Roof Assembly Thermal break (energy loss) at joints. Fastener rubbing on underside of membrane. Thermal bridge at fastener. Fastener through bottom of flute. Solutions for the Built World

17 Single Insulation Layer Failure Mode Fastener head punctures membrane Unsupported screw rocks Solutions for the Built World 17

18 Single Ply Failure Mode Fastener Backout

19 Myth No. 1 Myth: Recovering an existing roof is just as good as tearing the old roof off plus it saves money. Fact: Wrong. Recovered roofs only last 2/3 as long as when roofs are torn off plus they fail to meet the Texas energy code. Solutions for the Built World 19

20 Recover Existing Roof Solutions for the Built World 20

21 Recover is Poor Value Recovered roofs last about 2/3 as long. Likely to cover up long-term deficiencies: Wet insulation Rotten wood nailers Rusted deck Poor drainage Usually do not meet the Texas Energy Code. Locks in energy inefficiency for 20 more years. Solutions for the Built World 21

22 Myth No. 2 Myth: White roofs save energy. Fact: Wrong. Heat island effect maybe, but energy for your building? Unlikely. Solutions for the Built World 22

23 How Cool is a Cool Roof? 89 ºF noon EPDM single-ply 173 F BUR topped with aggregate 159 F BUR topped with capsheet 158 F 23

24 How Cool is a Cool Roof? 89 ºF noon Cool single-ply 121 F Cool coating over BUR 108 F 24

25 So What Are the Trade-Offs? Insulation??? R-Value?? 25

26 Energy Costs Electricity for Commercial Customers, $/kwh Average Retail Price of Electricity, Commercial End Use Source: EIA, 2009 Boston Newark Raleigh Atlanta Miami Cleveland Chicago St. Louis Minneapolis Fort Worth Colo.Sprgs. Phoenix San Diego Fresno Seattle 26

27 Annual Savings, $/square Annual Energy Savings Southern Annual Energy Savings For a Reflective Roof Membrane vs. a Black Roof Membrane R-Value Miami Atlanta Fort Worth Phoenix San Diego 27

28 Keys to a Sustainable Energy Efficient Roofing System Most sustainable roof = longest life. Most energy efficient: Insulation trumps cool roof effect Texas Energy Code = R-22 Design the entire assembly and all components, not just the skin. Tear off old roof; do not recover. Solutions for the Built World 28

29 Best Practice Roof Design: Sustainable Energy Efficient Reroofing Presented by: Edis Oliver, PE Principal 9511 Lake Creek Parkway Austin, Texas Solutions for the Built World 29

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