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Case Studies of RVRS design; Use of
Light Weight Panelized Construction in
Multiple Projects
OBEC
March 2016
Blair Davies,...
Engineered Assemblies
“Unite the House of Design with The Field of Construction”
–  Thermally Broken RVRS Facades
–  Dayli...
Speaker
Blair Davies, P.Eng
–  BaSc University of Waterloo – Civil Engineering
–  MBA Schulich School of Business
–  Build...
Agenda
•  Introduction – does all this matter?
•  What matters
•  Definition and history
–  DIN 18516
–  British Standards...
Is all this necessary?
- March 9, 2016page 5
What matters
•  Ventilation
•  Drainage
•  Thermal Bridging
•  Secure
•  Impact
•  Weight
•  Durable
•  Constructible
•  C...
Light weight matter?
•  Fibre cement 15 kg/m2
•  Ceramic 35 – 50 kg/m2
•  Metal 4.5-7.3 kg/m2
•  Steel stud wall; insulati...
Define RVRS
•  Cladding stands off the moisture resistant surface
to create a drainage plane and ventilation cavity.
•  Ve...
- March 9, 2016page 9
•  Framing – stud, concrete,
brick, etc
•  Sheathing, AVB
•  Insulation
•  Weather barrier
•  Cavity...
- March 9, 2016page 10
Detail in
practice
11	
Key Attributes of RVRS Facades?
•  Remove water and vapour in active, natural manner from assembly
•  Exterior takes a...
History and Standards
•  Ventilated façade in Europe
–  DIN 18516 – German Construction Standard
•  Specifies all key attr...
DIN 18516
•  Covers
–  Scope and field of application
–  Concepts
–  Requirements
–  Design loads, thermal effects and str...
NBS Section H92
•  Vertical building envelope; Outer skin
•  Airtight insulated backing wall, separate by ventilated cavit...
Business Opportunity
•  Materials developed to leverage RVRS mostly from Europe
–  High density fibre cement
–  Glass rein...
RVRS suitable for all building types
HouseCondo HotelUniversity SchoolHospital
Alcoa building pittsburgh
1950 1st modern use
Walter Gropius,
gropiusstadt, Berlin,
b1960-1975
Eternit panels in high
rise ventilated facade
application
Pressure Equalization •  Ideal
•  Ambiguous
•  Planning ≠ Actual
•  Structural considerations
•  Not part of European stan...
P.E. - compartmentalization
•  Horizontal closures so air can get in, but can’t get out
•  Seeing specifications with comp...
Rain Screen Membrane
•  Water resistant, water vapour permeable membrane
•  Secondary drainage plane
•  Aesthetic black re...
Weather Membrane
§ For Closed Joint Systems (with no long term UV)
•  High WVT 150 perms
•  120 g/m2
•  Drainage Plane
•  ...
Drying Rate
MVTR (perms)Comparison
0
20
40
60
80
100
120
140
160
Prod 1 Prod 2 Prod 3 Prod 4
Perms
Perms
Courtesy
Weather membrane UV
§ For Open Joint Wall Systems (long term UV)
•  Long Term UV Resistance
l  DIN EN 13859 (5,000 hours e...
26
27
Installation
Ø  Attachment
l Over insulation, behind cladding
l Clips or system support, screws with plates
Ø  Overlapp...
•  Robust
•  Breathable
•  Water Resistant
•  UV Resistant
Why Weather Membrane?
Panels
page 29
Zinc
ACP
FRC &
GFRC
Phenolic
PorcelainCeramic
ACP
Stone
veneer
Unlimited choice
All conditions have been done
- March 9, 2016page 30
Case Study 1
Data Centre
•  Parliament St Data Centre
•  Cladding, cavity, WB, Insulation, Thermally broken substructure,
...
- March 9, 2016page 32
- March 9, 2016page 33
- March 9, 2016page 34
Case Study 2 - McLean Park
Towers – Tower Renewal
•  Social housing, Vancouver
•  High Density Fibre Cement, vertical girt...
- March 9, 2016page 36
Case Study 3
88 Sheppard E, Minto
•  HDFC, Vertical girts, cavity, WB, insulation and girts, AVB,
Framing or Concrete
•  E...
- March 9, 2016page 38
Details – need direction
- March 9, 2016page 39
- March 9, 2016page 40
AVB
WB
Case Study 4
•  2 Virtue Street
•  HDFC, girts, cavity, breather
membrane over brick
•  Un-insulated
•  HDFC 14.9 kg/m2
• ...
- March 9, 2016page 42
Renovation adds new vigour to a sagging
Toronto home Aug 2013
Case Study 5
Addington Residence U
Guelph
•  Ceramic panels, system rails, weather
membrane, horizontal girts, sprayfoam i...
- March 9, 2016page 44
What would it take to make a real case
study – anyone?
•  Instrumentation
•  Long term study of RH in insulation
•  Measur...
Construction Best Practices
•  5 things need to be done right to have RVRS success with
panelized products eg high density...
Unanswered questions
•  What happens to wet insulation over long term?
•  Why isn’t metal panel / ACP installed as RVRS?
•...
Conclusion
•  RVRS Façade a significant design choice for aesthetic and
envelope performance reasons
•  Engineered extensi...
OBC
Review
•  Part 4 Structural
–  All systems can be designed for all Canadian loads by changing
spacing, gauge and mater...
OBC
•  5.4.1.2 Air Barriers CAN/ULCS741
•  5.5.1.1 (1) assemblies shall be such that they control vapour
diffusion or perm...
OBC •  Part 9 is different
–  9.20.13. Control of Rain Water Penetration
–  9.25.3. Air Barrier Systems
–  9.25.4. Vapour ...
Rear Ventilated Rain Screen
(Moisture Management)
Drainage and ventilation
Some water gets
in, and then
drains out.
Conden...
Alternatively – Single Skin Construction. Water always
gets in causing deterioration
Crack
Drained cavity Rainscreen eg Masonry
•  Masonry uses Rainscreen term – different
than RVRS
•  Drainage of water that penet...
RVRS (Insulation)
NATURAL INSULATION – 0.5 R Value from RVRS
Energy Efficiency
Consumption of
AC/Heating
Acoustic Insulati...
RVRS
(Temperature Regulation)
When the outside temperature is HOT, the ventilated rain
screen cladding has a cooling effec...
RVRS
(Temperature Regulation)
When the temperature is COLD outside the same process occurs:
•  Most of the cold air is
ref...
Rear Ventilated Rain Screen OBEC Mar 2016
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RVRS with light weight panelized systems.

Rear Ventilated Rain Screen OBEC Mar 2016

  1. 1. Case Studies of RVRS design; Use of Light Weight Panelized Construction in Multiple Projects OBEC March 2016 Blair Davies, P.Eng VP GM Engineered Assemblies - March 9, 2016page 1
  2. 2. Engineered Assemblies “Unite the House of Design with The Field of Construction” –  Thermally Broken RVRS Facades –  Daylighting –  High performance Metal Roofs Partners »  Etex - Imetco »  Composites Gurea - SRP Canada »  Formica - AWF »  Gentas - CPI Daylighting >1000 projects; no warranty claims, no non payment for non performance Sister company Praxy installation Ontario - March 9, 2016page 2
  3. 3. Speaker Blair Davies, P.Eng –  BaSc University of Waterloo – Civil Engineering –  MBA Schulich School of Business –  Building envelope business since 2008 –  Buildings across Canada - March 9, 2016page 3
  4. 4. Agenda •  Introduction – does all this matter? •  What matters •  Definition and history –  DIN 18516 –  British Standards •  Pressure Equalization – the debate •  Case Study #1 –  Parliament St Data Centre – ceramic •  Case Study #2 –  McLean Park Towers – fibre cement •  Case Study #3 –  88 Sheppard, Minto – fibre cement •  Case Study #4 –  2 Virtue Street – fibre cement recladding •  Case Study # 5 –  Addington Residence – ceramic recladding •  Unanswered questions •  Conclusion •  Ontario Building Code •  Discussion - March 9, 2016page 4
  5. 5. Is all this necessary? - March 9, 2016page 5
  6. 6. What matters •  Ventilation •  Drainage •  Thermal Bridging •  Secure •  Impact •  Weight •  Durable •  Constructible •  Climate and weather •  Acoustics - March 9, 2016page 6
  7. 7. Light weight matter? •  Fibre cement 15 kg/m2 •  Ceramic 35 – 50 kg/m2 •  Metal 4.5-7.3 kg/m2 •  Steel stud wall; insulation; thermally broken substructure 20kg/m2 (GUESS) •  Brick 174 kg/m2 •  Precast(300mm) 718 kg/m2 •  EIFS (100mm) 8 kg/m2 •  Curtain wall 49 kg/m2 - March 9, 2016page 7
  8. 8. Define RVRS •  Cladding stands off the moisture resistant surface to create a drainage plane and ventilation cavity. •  Vertical cavity for stack effect and capillary break. •  The wall open top and bottom to allow ventilation, •  Intermediate gaps open or closed; aesthetic decision. •  Insulated or non-insulated. - March 9, 2016page 8 Source: Wikipedia
  9. 9. - March 9, 2016page 9 •  Framing – stud, concrete, brick, etc •  Sheathing, AVB •  Insulation •  Weather barrier •  Cavity •  Panels •  Thermally Broken substructure
  10. 10. - March 9, 2016page 10 Detail in practice
  11. 11. 11 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
  12. 12. History and Standards •  Ventilated façade in Europe –  DIN 18516 – German Construction Standard •  Specifies all key attributes •  Spacing behind panel minimum 20mm –  CWCT H92 –  NBS British Construction Standard •  Canadian Construction Technology Update –  1963 NRC –  1999 CTU –  Cladding leakage area to Ventilation area suggested 10:1 •  USA NIBS - March 9, 2016page 12
  13. 13. DIN 18516 •  Covers –  Scope and field of application –  Concepts –  Requirements –  Design loads, thermal effects and structural movements –  Structural analysis –  Protection of materials –  Testing of connectors, fixing and ties –  Documentation –  Inspection - March 9, 2016page 13
  14. 14. NBS Section H92 •  Vertical building envelope; Outer skin •  Airtight insulated backing wall, separate by ventilated cavity •  Key distinction is that curtain walling is usually the whole envelope, while rainscreen cladding is the outer protective layer of the envelope. - March 9, 2016page 14
  15. 15. Business Opportunity •  Materials developed to leverage RVRS mostly from Europe –  High density fibre cement –  Glass reinforced concrete –  Phenolic –  Ceramic –  Porcelain –  Metals –  Stone laminates –  Wood panels –  Hybrids •  Subsystems •  Design •  Labour - March 9, 2016page 15
  16. 16. RVRS suitable for all building types HouseCondo HotelUniversity SchoolHospital
  17. 17. Alcoa building pittsburgh 1950 1st modern use
  18. 18. Walter Gropius, gropiusstadt, Berlin, b1960-1975 Eternit panels in high rise ventilated facade application
  19. 19. Pressure Equalization •  Ideal •  Ambiguous •  Planning ≠ Actual •  Structural considerations •  Not part of European standards - March 9, 2016page 19 Sources include: National Building Service UK 1-Jan-2010 “Rainscreen cladding; letting air in to keep rain out”
  20. 20. P.E. - compartmentalization •  Horizontal closures so air can get in, but can’t get out •  Seeing specifications with compartmentalization •  Some study that at façade corners and parapets this helps PE.* •  Europeans products do not recognize this practice - March 9, 2016page 20 Source: MCA Whitepaper 11/2014 v2 NRC CTU no 17 1998 Graphic by Nichiha
  21. 21. Rain Screen Membrane •  Water resistant, water vapour permeable membrane •  Secondary drainage plane •  Aesthetic black reveal with long term UV resistance for open joint systems •  Can be the deemed air barrier if sealed •  Installed directly behind cladding - March 9, 2016page 21
  22. 22. Weather Membrane § For Closed Joint Systems (with no long term UV) •  High WVT 150 perms •  120 g/m2 •  Drainage Plane •  CCMC listed •  Air Barrier Courtesy
  23. 23. Drying Rate MVTR (perms)Comparison 0 20 40 60 80 100 120 140 160 Prod 1 Prod 2 Prod 3 Prod 4 Perms Perms Courtesy
  24. 24. Weather membrane UV § For Open Joint Wall Systems (long term UV) •  Long Term UV Resistance l  DIN EN 13859 (5,000 hours exposure <5% loss) •  Drainage Plane •  Air Barrier courtesy
  25. 25. 26
  26. 26. 27 Installation Ø  Attachment l Over insulation, behind cladding l Clips or system support, screws with plates Ø  Overlapping l Shingle style with 6 inch overlap Ø  Seams l Tape vertical seams and details l Tape all seams in Air Barrier installations
  27. 27. •  Robust •  Breathable •  Water Resistant •  UV Resistant Why Weather Membrane?
  28. 28. Panels page 29 Zinc ACP FRC & GFRC Phenolic PorcelainCeramic ACP Stone veneer Unlimited choice
  29. 29. All conditions have been done - March 9, 2016page 30
  30. 30. Case Study 1 Data Centre •  Parliament St Data Centre •  Cladding, cavity, WB, Insulation, Thermally broken substructure, AVB, framing. •  Effective R Value Goal 21 •  Extruded Ceramic (35kg/m2) + Ceramic Baguettes •  Cavity dimension = 40mm vertical + 63mm. •  Insulation type = Roxul Cavity Rock 4” (100mm) •  WB type = SRP Airoutshield •  AVB type = Soprema •  Special conditions: designed for disaster conditions, so extreme slab deflections expected •  Why: “Relate local masonry in modern way to reflect use of building” WZMH •  Architect WZMH, GC Urbacon, Installer Flynn Canada - March 9, 2016page 31
  31. 31. - March 9, 2016page 32
  32. 32. - March 9, 2016page 33
  33. 33. - March 9, 2016page 34
  34. 34. Case Study 2 - McLean Park Towers – Tower Renewal •  Social housing, Vancouver •  High Density Fibre Cement, vertical girts, WB, thermally broken substructure, AVB, Concrete •  HDFC 14.9 kg/m2 faced fastened with colour matched rivets •  25mm cavity with vertical galvanized steel girts •  Roxul Cavity Rock 4” (100mm) •  Thermally broken facade •  Vaproshield WB •  Soprema AVB •  Special conditions: •  JRS Engineering; Installer Marine Cladding - March 9, 2016page 35
  35. 35. - March 9, 2016page 36
  36. 36. Case Study 3 88 Sheppard E, Minto •  HDFC, Vertical girts, cavity, WB, insulation and girts, AVB, Framing or Concrete •  Effective R value not a goal •  HDFC 14.9 kg/m2 adhered with Dynamic Bond Adhesive •  Cavity dimension 25mm •  Roxul semi-rigid rockboard 40 2” and 3” •  Roxul curtain rock 5”SRP AirOutShield UV •  AVB type TBD •  Rafael + Bigauskas Architects; GC and Owner Minto; Installer Praxy Cladding - March 9, 2016page 37
  37. 37. - March 9, 2016page 38 Details – need direction
  38. 38. - March 9, 2016page 39
  39. 39. - March 9, 2016page 40 AVB WB
  40. 40. Case Study 4 •  2 Virtue Street •  HDFC, girts, cavity, breather membrane over brick •  Un-insulated •  HDFC 14.9 kg/m2 •  Cavity dimension 25mm •  SRP AOS UV •  AVB poly inside studs - March 9, 2016page 41
  41. 41. - March 9, 2016page 42 Renovation adds new vigour to a sagging Toronto home Aug 2013
  42. 42. Case Study 5 Addington Residence U Guelph •  Ceramic panels, system rails, weather membrane, horizontal girts, sprayfoam insulation on top of brick façade •  Ceramic 35 kg/m2 •  Cavity dimension 20mm •  Spray foam 4” (100mm) •  SRP AOS non UV WB •  Blueskin SA behind girts, Spray foam is AVB •  Unique: Brick fastened back to block, and cavity filled. Insulated rainscreen fastened to brick façade - March 9, 2016page 43 Larkin Architects; GC Harbridge and Cross; Installer AMNA
  43. 43. - March 9, 2016page 44
  44. 44. What would it take to make a real case study – anyone? •  Instrumentation •  Long term study of RH in insulation •  Measurement during weather incident - March 9, 2016page 45
  45. 45. Construction Best Practices •  5 things need to be done right to have RVRS success with panelized products eg high density fibre cement. 1.  Ventilation top and bottom. 2.  Vertical substructure for ventilation. 3.  Panels allowed to move for thermal and for building movement, typically with fixed and floating points. 4.  Substructure spacing set by live and dead loads. 5.  Reasonably true wall or adjustable substructure - March 9, 2016page 46
  46. 46. Unanswered questions •  What happens to wet insulation over long term? •  Why isn’t metal panel / ACP installed as RVRS? •  Why does OBC not cover topic completely? •  Why are product choices in Canada limited? - March 9, 2016page 47
  47. 47. Conclusion •  RVRS Façade a significant design choice for aesthetic and envelope performance reasons •  Engineered extensively, mostly in Europe •  Business opportunity for Canadians •  A few things need to be done right, but reasonable for most cladding trade companies to learn •  Thankyou. - March 9, 2016page 48
  48. 48. OBC Review •  Part 4 Structural –  All systems can be designed for all Canadian loads by changing spacing, gauge and material of substructure. –  Seismic testing available for heavier facades eg ceramic. No call yet for testing of phenolics, fibre cement, metal panel –  Panels themselves designed to pass live loads back to substructure, not provide any structural role to the building. •  Part 5 –  5.1.4.2 Resistance to Deterioration –  CSA S478 Durability of Buildings –  5.2.2.1 Determination of Structural loads – comply –  5.3.1 Thermal resistance – not the panels, just the insulation layer. Expectation is cavity has higher or lower temp than outside, improving energy usage – needs proving. •  Important to design due point in right place between AVB and Weather membrane •  Penetration detailing essential – thermal bridging and air transfer to be eliminated –  5.4.1 Air Barrier – at least two layers of protection, insulation may offer another or replace a barrier. - March 9, 2016page 49
  49. 49. OBC •  5.4.1.2 Air Barriers CAN/ULCS741 •  5.5.1.1 (1) assemblies shall be such that they control vapour diffusion or permit venting to the exterior so as to minimize accumulation of condensation in the building component or assembly. •  5.6.1 Protection from Precipitation –  Except as provided in Sentence (2), where a building component or assembly is exposed to precipitation, the component or assembly shall, •  (a) minimize ingress of precipitation into the component or assembly, and •  (b) prevent ingress of precipitation into interior space. –  (2) Protection from ingress of precipitation is not required where it can be shown that such ingress will not adversely affect any of …. •  5.6.2 Sealing and drainage – reads like sealing is good. May have misguided intentions. - March 9, 2016page 50
  50. 50. OBC •  Part 9 is different –  9.20.13. Control of Rain Water Penetration –  9.25.3. Air Barrier Systems –  9.25.4. Vapour Barriers –  9.25.5. Properties and Position of Materials in Building Envelope –  9.27. Cladding TBD - March 9, 2016page 51
  51. 51. Rear Ventilated Rain Screen (Moisture Management) Drainage and ventilation Some water gets in, and then drains out. Condensation and water vapour vented to exterior.
  52. 52. Alternatively – Single Skin Construction. Water always gets in causing deterioration Crack
  53. 53. Drained cavity Rainscreen eg Masonry •  Masonry uses Rainscreen term – different than RVRS •  Drainage of water that penetrates the brick is allowed to drain out •  Limited to no ventilation; closed top and bottom of wall. •  Less active plenum; reducing benefit of ventilation •  Constructability issues with ensuring drainage is working •  Heavier, more steps to build - March 9, 2016page 54
  54. 54. RVRS (Insulation) NATURAL INSULATION – 0.5 R Value from RVRS Energy Efficiency Consumption of AC/Heating Acoustic Insulation
  55. 55. RVRS (Temperature Regulation) When the outside temperature is HOT, the ventilated rain screen cladding has a cooling effect on the building •  Most of the sun’s rays are reflected •  Ventilating effect of the air gap
  56. 56. RVRS (Temperature Regulation) When the temperature is COLD outside the same process occurs: •  Most of the cold air is reflected by the exterior architectural panel •  The remaining cool air will partially dissipate by the ventilating effect of the air gap between the architectural panel and the structural wall •  Insulation is protected, so will remain effective
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    Oct. 18, 2016

RVRS with light weight panelized systems.

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