Presentation slides by Gary Clark from HOK & RIBA member for the RIBA 2030 Climate Challenge Rising to the performance challenge: What it means for Architects webinar on 24th March.

1. Pathway to Net Zero
Gary Clark
Head of Science & Technology, HOK London Studio
Honorary Professor of Sustainable Architecture,
Queens University Belfast
March 2022

2. Sustainable Goals and Outcomes

3. RIBA 2030 Climate Challenge Trajectories

4. RIBA Sustainable
Outcome Metrics
Current
Benchmarks
2020 Targets 2025 Targets 2030 Targets Notes
Operational Energy
kWh/m
2
/y
225 kWh/m
2
/y
DEC D rated
(CIBSE TM46
benchmark)
< 170 kWh/m
2
/y
DEC C rating
< 110 kWh/m
2
/y
DEC B rating
< 0 to 55 kWh/m
2
/y
DEC A rating
UKGBC Net Zero Framework
1. Fabric First
2. Efficient services, and low-carbon heat
3. Maximise onsite renewables
4. Minimum offsetting using UK schemes
Embodied Carbon
kgCO2e/m
2
1100 kgCO2e/m
2
(M4i benchmark)
< 800 kgCO2e/m
2
< 650 kgCO2e/m
2
< 500 kgCO2e/m
2
RICS Whole Life Carbon (A-C exc. B6, B7)
1. Whole life carbon analysis
2. Using circular economy strategies
3. Minimum offsetting using UK schemes
Potable Water Use
Litres/person/day
> 16 l/p/day
(CIRA W11
benchmark)
< 16 l/p/day < 13 l/p/day < 10 l/p/day Using CIBSE Guide G
Best Practice
Health Metrics
References
Overheating 25-28 °C maximum for 1% of occupied hours CIBSE TM52, CIBSE TM59
Daylighting > 2% av. daylight factor, 0.4 uniformity CIBSE LG10
CO2 levels < 900 ppm CIBSE TM40
Total VOCs < 0.3 mg/m
3
Approved Document- F
Formaldehyde < 0.1 mg/m
3
BREEAM
RIBA 2030 Climate Challenge: Non-domestic Building Targets
75%
Reduction
50%
Reduction
40%
Reduction

5. RIBA Awards Sustainability Criteria

6. VALUE-DRIVEN SUSTAINABLE DESIGN

9. The Francis Crick Institute
BREEAM Excellent
Well Building Principles
King Abdullah University of Science and Technology
LEED platinum
Well Building Platinum
HOK Sustainable Research Buildings
Advanced Research Centre, University of Glasgow
BREEAM Excellent
Well Building Principles

10. Advanced Research Centre, University of Glasgow

11. Predicted Operational Energy Breakdown
Advanced Research Centre, Glasgow

12. Main Reception and Atrium

13. Pathway to Net Zero
Carbon Labs
Results

14. Whole Life Carbon Targets

15. Whole Life Net Carbon Research Case Studies
Compact Building Form (8 Floors) Linear Building Form (5 Floors)
With Piercy&Company

16. -200
-100
0
100
200
300
400
500
600
700
800
900
1000
Edinburgh
Life Science
Lab
I2SL S-Labs
US Average
Lab
Cambridge
Chemistry
Lab
Manchester
Chemistry
Lab
HEEPI
Chemistry
Lab
Benchmark
York Life
Science Lab
Liverpool
Life Science
Lab
HEEPI Life
Science Lab
Benchmark
GSK
Nottingham
Chemistry
Lab
Typical
Office
Benchmark
2030 Net
Zero Lab
Target
Energy
Use
Intensity
(kWh/m²/yr)
Benchmark Heating Regulated Electricity Equipment and Small Power Renewables
Benchmark source:
S-Labs, 2011
75% Reduction inc.
on site renewables
589 kWh/m2
147 kWh/m2
25% Offsetting
Operational Labs Benchmarks

17. Multi-Objective Optimisation
Embodied carbon sensitivity analysis
Dynamic Operational Energy analysis
Renewables
Cost
Structural Optimisation: Mass Timber
Whole Life
Cycle Analysis

18. Commercial Lab Operational Energy Results
60%
Reduction
S-lab Benchmark
589 kWh/m2
15%
Renewables
+
Hours of operation
assumption
7am to 7pm
Best
Practice
Inc. 6 ac/h
Air-tightness Insulation Glazing
Performance
Shading Glazing
Ratio
25%
Offsetting
+
Air Change

19. Embodied Carbon Parametric Variables
Net Zero 2030: Mass Timber Frame
Structure Mass Timber with screed topping for
vibration control
Walls Timber frame panel system
Glazing All timber curtain walling and window
systems
Fit-out No Suspended Ceiling, no raised floor,
polished screed floors, timber glazed partitions,
organic paint and coating systems etc
Intermediate : In-situ Concrete Frame
Structure In-situ concrete with 50%GGBS
cement replacement
Walls Pre-cast concrete panel system
Glazing Aluminium curtain walling
Fit-out Typical Suspended Ceiling, raised floor,
aluminium glazed partitions, industry standard
paints and coatings etc
Base: Hybrid Steel Frame
Structure Steel and pre-cast concrete with 50%GGBS
cement replacement
Walls Aluminium cladding panel system
Glazing Composite Aluminium and timber curtain
walling and windows.
Fit-out Limited Suspended Ceiling, limited raised floor,
screed and resin floors, aluminium glazed partitions,
low VOC water based paints and coatings etc

20. LCA analysis (One-Click LCA)
+
+

21. Structural system options
Study from AKT-II

22. Structural analysis
Study from AKT-II

23. -400
-200
0
200
400
600
800
1000
1200
1400
Benchmark (RIBA) Baseline Intermediate Net Zero 2030
Total Embodied Carbon Foundation, sub-surface, basement and retaining walls
Floor and roof slabs and framing Columns and load-bearing vertical structures
External walls, façade and roof insulation Internal walls and non-bearing structures
Finishes (flooring system, coatings and dropped ceilings) MEP
Timber Biogenic Sequestration
90%
Reduction
Commercial Lab Embodied Carbon Results
38%
Reduction
44%
Reduction
60%
Reduction

24. 4,410
8,550
Base Option
Operational Carbon Emissions (Tonnes CO2)
Embodied Carbon Emissions (Tonnes CO2)
4,410
7,750
Intermediate Option
4,410
1,590
Net Zero Option
Total Whole Life Carbon
12,015 Tonnes CO2
(60,075 Trees)
Total Whole Life Carbon
11,215 Tonnes CO2
(56,075 Trees)
Total Whole Life Carbon
6,000 Tonnes CO2
(30,000 Trees)
Based on 10,000m2 GIA building and 30 year life span using 0.1 electricity carbon factor
Whole Life Net Zero Carbon Results

25. Climate Change Actions
1. Agree sustainable outcomes- UNSDGs and Metrics with client at outset
2. Circular Economy- Retrofit, Recycle and design for disassembly
3. Design for Net Zero Performance- Measurement and verification
4. Increase Bio-diversity- Aim for 20% net bio-diversity gain
5. Low embodied and healthy materials- local, long life, robust, and recycled
6. Well building principles- daylight, air quality, acoustics, contact to nature
7. Passive Design- fabric first + passivhaus level of envelope performance
8. Regenerative Engineering- working with natural systems
9. Non fossil fuels- All electric PV, Heat pumps, etc
10. Plan for Use- Design for closing the loop and POE aftercare

26. Thank you