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DfMA & Designing for PrefabricationTuesday, July 21st, 12:15-1pm
Johann Betz, Founder – Offsite Design LtdMEng, Dipl-Ing (FH) Wood Technology and Timber construction
To harness the benefits of prefab/offsite:
• Increase construction productivity. • Lift quality in construction.• Build more sustainably.• Improve H&S in construction.• Etc.
Why DfMA?
“Producing parts from raw materials, andcombining these parts into sub-assemblies and assemblies.”
What is Manufacturing?
• In-efficient building work
• Quality issues
• Un-controlled environment
On-site vs. Off-site construction
• Relocate fabrication indoors and apply lean
manufacturing and QA principles.
• Over the wall: Traditional method, utilises little to no communication between design and manufacturing
• Sign-off: Manufacturing documents must be approved and signed off by manufacturing after the fact.
• Limited collaboration: Design interacts with manufacturing for critical information.
• Concurrent Engineering: Manufacturing and Design work together from conception to product launch.
Design – Manufacturing Paradigms
“Over the wall” design process
Concurrent Engineering
Design for Assembly
Design for Quality
Design for Manufacture
Design for Environment
Design for Disassembly
Design for Service
Design for Reuse
DFX
Concurrent engineering engages the stake holders of each level of a product.DFX – Design for X, with X = stake holder
Idea Design Manufacture Assembly In Service
on-siteoff-site
knowledge transfer
Fin
alis
ed p
lan
nin
g
DFA
DFM
Project cycle
Hig
hLo
w
Idea Design Manufacture Assembly In Service
on-siteoff-site
Fin
alis
ed
pla
nn
ing
Design Concept
DFATimber/systems
selectionDFM
DfMA Optimised
Project
Suggestions for simplification and
optimisation
Review of producibility and manufacturing
processes
Review of timber/prefab
systems selection
Fin
alis
ed
pla
nn
ing
DfMA Progression
BIM – DfMA Infrastructure
DfMA - Examples
DfMA - Examples
Photos: Concision
Lemonwood School, Rolleston
DfMA - Examples
With DfMA
DfMA - ExamplesWithout DfMA
DfMA - Examples
DfMA - Examples
Q: “Working with a system/DfMA: creative constraint or opportunity?”
Richmond Oval, BC
Forest Pavilion, Germany
Cambridge Mosque, UK
Working with a system/DfMA: constraint or opportunity?
Photos: Huber & Sohn GmbH
The Urban Prefab
Rendering: Architekten Hermann Kaufmann
DfMA: constraint or opportunity?
NZQA accreditation being planned for
Trade and Tertiary education providers.
Further funding being sort from Primary
Growth Fund (PGF) for the NZ Wood
Design Center. ($3.7m)
NZ Wood Design Guides
https://nzwooddesignguides.wpma.org.nz
Designing for Prefabrication
• Prefabricated timber systems• DfMA• Procurement• Transport, Storage and Erection• Compliance: The Consenting Process• Project Snapshots
• Risks and Opportunities• Compliance Planning, Traceability• DfMA• Lean Construction• Construction Planning• Installation, Tolerances• Temporary Timber Protection Strategies• Offsite activities and Construction Programme
Construction Guidance for Timber Buildings
Conclusions
• True DfMA very rare in NZ/AUS; DfMA in some projects, but generally only scratching the surface of the (productivity) gains possible.
• DfMA requires a paradigm shift from “over the wall” linear approach to “concurrent engineering”.
• DfMA is a collaborative process involving key stakeholders from prefabrication, services, and construction early. It is NOT just another ‘thing to do’ for the designer.
• There are many different MMC systems and approaches. One size will never fit all.
• DfMA must be the starting point. NOT an afterthought.
• Work closely with DfMA expertise for coordination, constructability, and producibility.
Next
• You are an Arch/Eng/developer working on a project that could feature timber/prefab systems. You are not quite sure where to start? Panels vs modules? Systems and standard details? Does offsite stack up?
• How could DfMA improve your project?
• Action points:• Designing for Prefabrication; download, read, and use the Guide:
https://nzwooddesignguides.wpma.org.nz/
• Offsite Design Ltd no obligation 1h consultation - [email protected]
• ECI - Early collaboration workshop involving project stakeholders/key suppliers(refer NZWood Guide)
Idea Design Manufacture Assembly In Service
on-siteoff-site
knowledge transfer
Fin
alis
ed p
lan
nin
g
DFA
DFM
To harness the benefits of prefab/offsite:
• Increase construction productivity. • Lift building performance and quality.• Build more sustainably.• Improve H&S in construction.
128 Montreal Street
Sydenham
Christchurch
03-331-6113
021-104-1485
www.offsitedesign.co.nz
Questions?
Find us on LinkedIn.
