dfma & designing for prefabrication · communication between design and manufacturing •...

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

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DFA

DFM

Project cycle

Hig

hLo

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Idea Design Manufacture Assembly In Service

on-siteoff-site

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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

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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 - johann@offsitedesign.co.nz

• 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

johann@offsitedesign.co.nz

www.offsitedesign.co.nz

Questions?

Find us on LinkedIn.