Thermally broken facade by engineered assemblies cc dec 2015 final
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The document discusses ventilated rainscreen facade systems and improving building envelope thermal performance. It covers topics such as reducing thermal bridging, meeting code requirements for effective R-values, and the benefits of thermally broken aluminum clip systems for attaching exterior cladding over insulation. Example projects using these clip systems show improved thermal performance over traditional methods while maintaining design freedom and constructability.
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Thermally broken facade by engineered assemblies cc dec 2015 final
- 1. page 1
- 2. Agenda • Scope • Market and code • Impact to Buildings • Current trends • Design Solution • Future page 2
- 3. 3 Products Design Installation “Uniting the house of Design with the field of Construction” Who
- 4. - December 2, page 4 Why
- 5. - December 2, page 5 Canada can become the best at this in the world World needs it Lead, don’t just follow Why
- 6. • Thermal bridging • Exterior opaque walls • Ventilated Facades using ‘panels’ • ICI building market page 6 What
- 7. page 7 Energy Usage Buildings Energy Loss in Buildings Walls What
- 8. - December 2, page 8 DEMAND SUPPLY
- 10. page 10 Source: Morrison Hershfield Why
- 11. page 11 Why
- 12. Sources to support • ASHRAE RP 1365 • “2 R’s don’t make your U” – Mark Lawton Morrison Hershfield • ASHRAE 90.1 • NECB 2011 • Many other – we did not invent this page 12
- 15. Buildings page 15 Schools ACP College +University Low rise and high rise Transport Infrastructure Retail Condos Municipal
- 17. Define RVRS • Cladding stands off the moisture resistant surface to create a drainage plane and ventilation cavity. • Vertical cavity for stack effect. • The wall is open top and bottom to allow ventilation, • Intermediate gaps can be open or closed; aesthetic decision. • The Rear Ventilated Rain Screen can be built over an insulated wall system, or simply over structure. (see discussion on designing thermally broken insulated RVRS systems) - December 2, page 17
- 18. 18 Key Attributes of RVRS Facades? • Remove water and vapour in active, natural manner from assembly • Exterior takes abuse of the weather - full heat, the sun, the wind… • Ventilation helps the building AND the façade product • Accommodates any amount of insulation • Insulation is always drying - better effective R • Simpler, more easily built and inspected - no caulking • Lighter thinner systems than concrete and brick • Unlimited choice in panel selection. • Better energy efficiency than most curtain wall • Less expensive than many other systems
- 19. - December 2, page 19 Detail in practice
- 20. A little deeper - December 2, page 20
- 21. Definitions • U Value – thermal conductance • R Value – thermal resistance • Nominal R Value – thermal resistance where only insulation – Typically one point in wall – No accounting for thermal bridges • Effective R Value – Total wall performance – Input for total building performance – Accounts for thermal bridges page 21
- 22. Steel through insulation page 22 • Short circuit or leak; need to view in 3D • Steel 1000 times U Value (conductance) • Energy loss from warm side, not just studs
- 23. You think it matters page 23 So important I’m digging into it myself Important but delegated to others Following building code minimums Clients want it 2013 2015
- 24. Effective R Value Targets of most recent projects page 24 2013 2015
- 25. - December 2, page 25
- 26. - December 2, page 26
- 27. How did we get here? - page 27
- 28. - December 2, page 28 Shaping Tomorrow’s Built Environment Today NECB 2011
- 29. ASHRAE 90.1 - December 2, page 29
- 30. - December 2, page 30 What EFFECTIVE R Value do you need?
- 31. Sources of Thermal Bridging • Metal substructure in cladding • Window and door frames • Parapets • Slab edges - December 2, page 31
- 32. - December 2, page 32 Worse the more insulation is required Old Ways Won’t Do Nominal R Value = 16 Effective R Value = 10.2
- 33. - December 2, page 33 Source Morrison Hershfield Old Ways Won’t Do
- 34. December 2, - December 2, 2015 page 34 Wrige table Target Effective R Value Continuous Vertical Girts Continuous Horizontal Girts Cross Girts 21 (3.70) 11.1(1.96) 13.5(2.38) 15.4(2.71) Imperial (Metric) Old Ways Won’t Do Source: Morrison Hershfield 52% 64% 73%
- 35. - December 2, page 35
- 36. page 36 NECB 2011 Effective R Value range from R 18 – 31 (RSI 3.2 – 5.5)
- 37. Status of Code • Ontario. ASHRAE 90.1 is code SB10 and 12 • BC. ASHRAE 90.1-2010 or NEBC 2011. • City of Vancouver. ASHRAE 2010 + 20%, • New Brunswick and Nova Scotia; NECB 2011 in 2015 • Alberta adopting an energy code – too early to tell • Quebec: residential code • NBC: not sure • International Construction Code; ASHRAE 90.1 in code - December 2, page 37 Source: Morrison Hershfield
- 38. SB 10 - December 2, page 38
- 39. Modeling – feedback from those doing work Are we asking the right questions? • Facts needed, not just goals of project • Assemblies are understood but not used • Factor inefficiencies of construction eg air leakage, fasteners • Thermal bridges must be accounted for - December 2, page 39
- 40. SB 10 holes - December 2, page 40
- 41. Impact to buildings - December 2, page 41
- 42. Systems Thinking - December 2, page 42 Save Energy Better thermal performance Reduce thermal bridgesLighter cladding needs less structure Strong light substructures create fewer bridges Effectively Continuous Insulation
- 43. What matters with Thermally Broken Façade Solutions - December 2, page 43 System Design Freedom = Cost effective Non combustible Suited for Ventilated facade Works w All Insulations Design freedom = clips free to be anywhere so Architect can create with no limits from substructure
- 44. Impact • Thicker walls 4” minimum • Adjustability for misaligned studs available • Flexibility for shapes of walls • Design freedom either same or less – watch this issue • Continuous AVB possible • Continuous weather barrier possible - December 2, page 44
- 47. Source TAC Clip - December 2, page 47
- 48. - December 2, page 48 Source: Morrison Hershfield
- 49. - December 2, page 49 Horiz bars 3’ o.c. Vertical bars 2’ o.c. Traditional system** 1.3 Crew hours / 100 sq ft TcLip on each stud Horiz bars 4’ o.c. Vertical bars 2’ o.c. TcLip system 2.0 Crew hours / 100 sq ft $1.2/sq ft premium Material + Labour 5000 sq ft job = $6k premium Adj. Horiz bars 3’ o.c. Vertical bars 2’ o.c. Adjustable system 3.7 Crew hours / 100 sq ft $3.0/sq ft premium Material + Labour 5000 sq ft job = $15k premium **Traditional systems had much less insulation too, so difficult to do apples to apples
- 50. - December 2, page 50
- 51. - December 2, page 51
- 52. Executive Summary “The Engineered Assemblies Thermal Clip System is an aluminum thermal clip system for attaching rain-screen cladding systems for steel stud wall assemblies with exterior insulation. Morrison Hershfield was contracted by Engineered Assemblies Inc. (E.A.I) to model the system in order to provide thermal performance values. The system is comprised of aluminum clips connected to horizontal and vertical sub-girts that support rain-screen panel cladding. The clips are attached to a steel stud back-up wall. Thermal breaks are provided at the connection between the sub-girt and clips via a cork/neoprene pad and between the clips and exterior sheathing via an aerogel insulation pad. See Figure 1 for a simplified rendering.” - December 2, page 52 Source: Morrison Hershfield
- 53. • Meets the prescriptive requirements for non- residential steel stud walls in ASHRAE 90.1-2007/2010 for all climate zones. • Performance of the system is validated through Modeling and the Finite Element Analysis (FEA) • Designed for Mid- and High-Rise (Non-Combustible) building envelopes • Engineered to accommodate Façade panels generally 8-26mm in thickness • Engineered for wind loads up to 50psf • Optimized vertical spacing – 900mm up to 1200mm apart - December 2, page 53 TClip Performance Engineering Complete
- 54. Model holds for all insulations - December 2, page 54 thermal resistance is independent of - Thickness of insulation - Type of insulation So pick the best insulation you can afford, and TClip provides you the ASHRAE 90.1 and highest effective solution
- 55. How Many Do I need (varies a lot by system) - December 2, page 55 TClip on each stud (400mm o.c.) 1200mm vertical dimension (roughly 0.5 clips/sq ft) Skipping studs 1300-1350 mm vertical dimensions Custom Roxul batts
- 56. Two Trends Maximum: develop strategies for very high insulation - December 2, page 56 Minimum: use aerogel/epdm to break connection of girt to stud
- 57. Minimum - page 57 • Traditional Z Girts • EPDM or AEROGEL break between girt and stud • Increases effectiveness • Depending on building if enough • Energy tradeoffs • Opaque walls less important eg short flat building, roof more important • Question of enforcement as well
- 58. - December 2, page 58 Hi Performance Insulation Insulation between studs Maximum Insulation Sheathing >R39
- 59. R&D Spray foam – deep cavity solution - December 2, page 59
- 60. Design Freedom - December 2, page 60
- 61. - December 2, page 61
- 62. - December 2, page 62
- 63. - December 2, page 63
- 64. Johann-Sebastian-Bach hall, castle in Köthen, Busmann + Haberer architects, Berlin
- 65. - December 2, page 65 Knox Church Baird Sampson Neuert
- 66. - December 2, page 66 This Location of this Independent of
- 67. Design - December 2, page 67
- 68. TheOldStandard - December 2, page 68 Horizontal Girt
- 69. TheNewStandard - December 2, page 69 Adjustable Horizontal Girt TClip Thermal Breaks
- 70. - December 2, page 70 T100 T150 T125 Three Clear Field Dimensions - Adjustable for wall alignment
- 71. Breather Membrane Dry! 1. Secondary drainage plane 2. Insulation performs better 3. Vapour escapes 4. Not visible 5. UV resistant
- 72. - December 2, page 72
- 73. - December 2, page 73
- 74. - December 2, page 74
- 75. - December 2, page 75 PlanView
- 76. - December 2, page 76 PlanViewWideHatBar
- 77. - December 2, page 77
- 78. - December 2, page 78
- 79. - December 2, page 79 WindowJamb
- 80. - December 2, page 80 Source Marine Cladding
- 81. - December 2, page 81
- 82. - December 2, page 82
- 83. - December 2, page 83
- 84. - December 2, page 84 OutsideCorner
- 85. - December 2, page 85 Macklin School - Toronto - TClip - Subset of project details
- 86. - December 2, page 86 Macklin School - Toronto - TClip - Subset of project details
- 87. Constructability • Adjustability • Vertical girt independence • Window detailing simple - December 2, page 87
- 88. UBC report – good third party analysis - December 2, page 88
- 89. page 89 WZMH Architects Data Centre Parliament St WZMH
- 92. - December 2, page 92
- 93. - December 2, page 93
- 94. What matters with Thermally Broken Façade Solutions - December 2, page 94 System Design Freedom = Cost effective Non combustible Suited for Ventilated facade Works w All Insulations Design freedom = clips free to be anywhere so Architect can create with no limits from substructure
- 95. Summary • Building energy use matters • Walls matter • Thermal bridges matter • ASHRAE has documented and it matters • Code is setting higher minimums • Constructible solutions exist • Detailing constructible • Cost effective design freedom exist • So up to you. - December 2, page 95
- 96. EA has all the info for you - December 2, page 96 Youtube Installation Animation Design Guide MH full report LnL Preso