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C-PAW Workshop: Next-Gen Retrofits for Multi-family Buildings

Join the California Partnership for Advanced Windows (C-PAW) Workshop on December 11, 2018, to learn about the benefits and market adoption of thin center glass triple pane windows for multi-family buildings. Supported by the California Energy Commission and other organizations, this workshop will explore the advantages, cooperating manufacturers, and potential for energy savings in California and beyond.

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C-PAW Workshop: Next-Gen Retrofits for Multi-family Buildings

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  1. California Partnership for Advanced Windows (C-PAW)Next Generation Retrofits for Multi-family Buildings WorkshopDecember 11, 2018 Mazi Shirakh, PE Zero Emissions Buildings Technical Lead California Energy Commission

  2. Organizations Supporting California Partnership for Advanced Windows (C-PAW) C-PAW was formed in summer of 2018 to facilitate widespread market adoption of the advanced thin center glass (skinny) triple pane windows, this effort is supported by: • California Energy Commission (CEC) • Lawrence Berkeley National Labs (LBNL) • California Building Industry Association (CBIA) • Pacific Gas and Electricity (PG&E) • Southern California Edison (SCE) • Sacramento Municipal Utility District (SMUD) Though not part of this partnership at the moment, Oregon and Canada are pursuing the same goals Cooperating Window Manufacturers Include: • Andersen Windows • Alpen Windows • Anlin Windows • PlyGem Windows Builder support is offered by De Young Properties

  3. Advantages of thin Center glass “skinny” triple pane windows Skinny triple pane windows are an alternative to standard double pane windows in variety of applications: • Same dimensions as double pane windows – no change in window framing or building construction practice, no redesigning required • Nearly the same weight as double pane windows, no additional labor for installation • Reasonable costs and very high performance in terms of U-factor and SHGC • Significant compliance credit for tradeoffs in new construction and existing buildings • Suitable for all buildings including residential single and multi-family, low and high-rise - and nonresidential buildings • Suitable for existing buildings and new construction, can replace the IGU or sash in existing windows without replacing the window frame • Potential for emissions and energy savings across vast geographic areas

  4. Anatomy of Skinny Versus Chunky Triple Pane Windows Standard Center Glass “Chunky” Triple Pane, ~25 mm IGU thickness Thin Center Glass “Skinny” Triple Pane, ~18 mm IGU thickness Standard Double Pane, ~18 mm IGU thickness

  5. Drop-In “Thin Lightweight Triple”“upgrade” all R3 (0.33 UF) double glazed windows to R4-7 (0.25-0.14 UF) without redesign, possible 40%+ reduction in window heat transfer Surface #1 #2 #3 #4 #5 #6 • Platform: U: ~.10-.15 • Thin float glass • .3, .5, .7, 1.1 mm • Multiple suppliers • 2 Low-E coatings • Krypton gas fill • Non-structural center • 2 seals, not 4 • Infrastructure exists • “Affordable” ~18-20 mm IGU width 0.7mm thin glass center layer Low-e 3 mm glass Foam spacer Butyl sealant

  6. Why skinny costs less now, what has changed? • Each year, millions of square feet of thin glass (0.7 mm or less) in being manufactured for flat screen TVs • As a result, over the past several years, the price of thin glass has dropped from $5/sf to 50 cents/sf • Price of krypton has also dropped because the lighting market has moved from HID to LED • This combination has made the skinny a cost competitive option The thin center glass is a byproduct of flat screen TVs

  7. How does “skinny” measure up against the heavy weights? Thin center glass triple pane windows: • Represent no change in construction practice – Widespread application across North America and beyond • 0.20 U-factor and SHGC window contribute 2.2 Energy Design Rating (EDR) points in performance path 2016 and 2019 Standards introduced these new measures: High Performance Attics (HPA): • Requires R19 below deck cavity insulation – Limited to southwest hot dry climate zones • May requires some changes in construction practice • Contributes 4.2 EDR points High Performance Walls (HPW): • Requires R20 in 2x6 framing and R5 continuous insulation – Works in new construction in all climate zones • May require some changes in construction practice • Contribute 1.7 EDR points Quality Insulation Installation (QII): • Works in new construction across all severe climate zones in new construction only • Unable to verify once drywall goes up • Contributes 2 EDR points in the performance path

  8. Questions? • Questions? 8

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