Energy Savings with Fully- Adhered Weather Barrier. Marysusan Couturier Jyoti Seth David Baur Diana Hun, ORNL Andre Desjarlais, ORNL

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1 Energy Savings with Fully- Adhered Weather Barrier Marysusan Couturier Jyoti Seth David Baur Diana Hun, ORNL Andre Desjarlais, ORNL

2 Why Fully-Adhered Protection vs. Mechanically Attached? Mechanically attached SEALS TO THE SUBSTRATE Stays adhered during construction, resisting blow offs & tears in windy conditions Creates a continuous & aggressive bond Prevents lateral water migration Fully Adhered SEALS TO ITSELF Laps are the natural weak points Laps are fully-adhered and aggressively bonded Does not require special treatment at the joints SEALS AROUND FASTENERS OR All Exterior Finishes are Mechanically Attached Each penetration is a potential entry point for water The adhesive forms a water-tight seal around the fastener Fully-Adhered System Protects Each Critical Entry Point from Effects of Weather 2

3 Test Air Leakage With Different WRB technologies in Typical Construction Side view

4 Front view 1/8 OSB joint Window 3-6 Similar penetrations to ASTM E /8 OSB joint 3 ½ ø Electrical box 1 ½ ø Pipe Rectangu lar electrical box 4 4 Metal duct 3-8 ¾ 1/8 OSB joint 4 4 curb 0-11 ½ 0-3 ½ 4

5 Wall Assemblies Monitor positions Vycor env-s Wall Mechanically Attached Wall Test Protocol Membranes installed per manufacturer s installation recommendations Measure initial air leakage Monitor temperature, RH, moisture, and heat flux Remeasure air leakage after one year

6 Air Leakage Study Results Assembly with Vycor env-s meets minimum air leakage results per 2012 IECC requirements. Significant Difference in Air leakage rate for mechanically attached vs. fully adhered WRB

7 Correlate Air leakage and Energy Costs/Savings Computer simulations using Energy Plus DOE s residential prototype building models single family detached house. Modeling Parameters Climate Zone City Prototype Heating System Foundation IECC Code 1 Miami Single Family Elec Resistance Slab Austin (San Antonio idf) Single Family HP Crawlspace Atlanta Single Family HP Crawlspace Baltimore Single Family Gas Heated Basement Chicago (Peoria idf) Single Family Gas Heated Basement Minneapolis Single Family Gas Heated Basement Fargo (Bismark idf) Single Family Gas Heated Basement Fairbanks Single Family Gas Heated Basement 2012

8 Annual Energy Savings Potential Using Grace env-s over Mechanically Attached Wrap $89/yr $97/yr $193/yr $371/yr $402/yr $518/yr $669/yr 15.3% savings 17% savings 31.2% savings 41.9 % savings 46.3% savings 51% savings 56.2% savings Average 37% less energy costs using fully adhered over mechanically attached WRB

9 How Durable are the WRB Assemblies? Remeasured air leakage and deconstructed assembly

10 How well did the WRB s stand up? Mechanically attached Mechanically attached Mechanically attached Loose flashing Mechanically attached Devil is in the details Fully adhered

11 Long Term Durability of WRB s No change in air leakage for assembly with Vycor env-s after 11 and 16 months exposure Significant increase in air leakage for wall assembly with mechanically attached after 11 and 16 months exposure. Fully adhered WRB saves energy costs and offers more durable assembly, less chance of moisture issues

12 Overcoming Barriers to Technology Adoption Multi-Family and Light Commercial Construction Fully-Adhered Sheet Membrane Material Cost Effective Communication of Fully-Adhered ROI to Specifiers, Installers, and Owners Improved Air Tightness Improved energy efficiency Durable during construction Less need for rework Appreciation for Weather Protection Benefits Prevents lateral movement of air/water behind membrane Fully-Adhered membranes can be more effectively detailed Durability in-service Reduces risk of moisture related damage Changes to Installation Practices Membrane installation and detailing differences Pre-job training mitigates learning curve; Typically overcome within hours

13 Market Acceptance Update Multi-Family and Light Commercial Construction Fully-Adhered Vapor Permeable Sheets are commercially available Marketed primarily for multi-family and light commercial buildings for 2 years; Multiple Participants Nationally available via traditional Lumberyard, Waterproofing, and One-Step (Roofing) Distributors Market Drivers are promoting adoption of Fully-Adhered Vapor Permeable Sheets More Demanding Building Code Requirements Owner Demand for energy efficiency Better Protection lessens risk of moisture related damage and litigation Rate of adoption progressing among all building types Response among builder and architectural community has been very positive Fully-adhered typically becomes the preferred product type after a successful project Market adoption and penetration is following a pattern typical for new building materials Manufacturers are realizing significant sales growth, from a small base

14 Q&A 14