Timber Projects for the Masses

LIAM DEWAR

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Designing for Mass TimberDevelopers | General Contractors | End-Users

Visual | QualityExposed Structure?

Time | SpeedProgramme?

Cost | Net Lettable AreaWall Build-ups?

EurbanEarly Specialist Involvement - Design to Delivery

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Programme is Key

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Column System Party Wall System Honeycomb System

Structural Design Proposal is Key

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Ensure Wall Design is Adequate

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Verification of Fire ResistanceFire Test Approach to EN 13501-2

Careful!

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Limit Exposed Structure

• Fire = thicker panel & wall!

• Implications on acoustics

• Panel joints / Grain direction

• Appearance Grade

• Finish (Planed or Sanded?)

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Optimise Design for CostWastage v Speed on Site

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Designing for ApprovalInsurers | Statutory Bodies| Structural Warranty Providers

Earth(quakes)

Water Fire

Air(tightness)

BRIEF

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Detailing for Durability - StructureLift Shaft

Bolt-through connection of Support Channels

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Detailing for Durability - StructureLift Shaft

Bolt-through connection of Lifting Eye

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Detailing for Durability - WaterProtection of Structure against Defective Insulation Layer

Breather Membrane

INSIDE

OUTSIDE

Detailing for Durability - WaterRemove Problem – Raise Timber Above Water

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Detailing for Durability - WaterBase Detail

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Detailing for Durability - WaterSolve Problem – Appropriate Waterproofing to Base

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Detailing for Durability - AirAirtightness

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Detailing for Durability - AirTape Panel Joints

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Managing Risk

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Managing MoistureDelivery

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• 12% +/- 3% moisture content on delivery

• Hygroscopic material – responds to environment

Managing Moisture

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Managing Moisture

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Managing Moisture

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Managing MoistureInstallation

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• Materials set-down on site

• Materials will get wet

• Allow time to dry out

Managing MoistureCompletion

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• Seal valleys

• Install temporary drains

Managing MoisturePost-Installation

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• If prolonged exposure to rain

• Moisture meter readings:

• Target < 15%

Managing MoistureDrying Out

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• Good ventilation

• Expose surfaces

• Clean site

• End grain sealer

Managing Building ServicesDesign Co-ordination

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Managing Exposed SurfacesTemporary Weather Protection

Fairmule House, London, 2005Quay 2c | Eurban, 4 installers

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Fairmule House

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Fairmule House

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Fairmule HouseSite

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule HouseLifting Points

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule HouseTeam of 4 Installers

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Fairmule House

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Fairmule House

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Fairmule HouseFloors

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Fairmule HouseInstallation

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule HouseLift Shaft

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Fairmule HouseLift Shaft

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Fairmule House

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Fairmule HouseLift Shaft

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Fairmule House

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Fairmule House

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Fairmule House

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Fairmule HouseExposed Structure

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Fairmule HouseWall & Floor Build-ups

Wall Structure: 85-135mmFloor Structure: 170mm

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Fairmule HouseExposed Structure

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Fairmule HouseFront & Side Elevation

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Fairmule HouseRear Elevation

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Fairmule House

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Fairmule House

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CLIENTAqua Properties

ARCHITECTQuay 2c Architects

CONCRETE ENGINEER

TIMBER ENGINEEREurban

MAIN CONTRACTORNone (Construction Management)

TIMBER CONTRACTOREurban/ m2

ACCOMMODATION11 Flats + 7 office Units

FLOOR AREA11,485 ft2

INSTALLATION PERIOD6 weeks

MATERIALS USEDCrosslam / Glulam / LVL / Steel

MANUFACTURER Merk Timber

COMPONENT THICKNESSES80, 115, 135mm (Walls); 170mm (Floors, Roof)

LIAM DEWAR – TIMBER FOR THE MASSES

Fairmule House, London, 2005Project Data

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Bridport House, London, 2010Karakusevic Carson | Eurban

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Bridport HouseLocation

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Bridport HouseDesign Problem

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Bridport HouseSolution

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Bridport HouseAlternative Option in Mass Timber Construction

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Bridport HouseUnit Mix

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Bridport HouseUnit Arrangement

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Bridport HouseEngineering Challenges

• Different layout of the loadbearing elements

• Overall shrinkage

• Overall stability

• Fire / Acoustic

• Logistics of a very tight site

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Bridport HouseLoadbearing Separating-Wall Structure

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Bridport HouseLoadbearing Structure

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Bridport HouseShrinkage

OVERALL LONG TERMSHRINKAGE 18mm

OVERALL LONG TERMSHRINKAGE 29mm

≈ 40% LESS SHRINKAGE

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Bridport HouseShrinkage

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Bridport HouseShrinkage

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Bridport House

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Bridport House

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Bridport HouseOverall Stability

Crosswise

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Bridport HouseOverall Stability

Elevation

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Bridport HouseOverall Stability

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Bridport HouseOverall Stability

Lengthwise

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Bridport HouseOverall Stability

Lengthwise

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Bridport HouseOverall Stability

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Bridport HouseOverall Stability

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Bridport HouseFire & Acoustic Separation

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Bridport HouseFire & Acoustic Separation

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Bridport HousePlasterboard for Fire Performance

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Bridport HouseFloating Screed for Acoustic Performance

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Bridport HouseComponent Model

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Bridport HouseOff-loading

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Bridport HouseMaterial Storage

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Bridport HouseWeek 1

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Bridport HouseWeek 6

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Bridport HouseWeek 10

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Bridport HouseCompletion

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Bridport HouseBrickwork Cladding

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Bridport HouseSite Comparison with Concrete

Concrete Frame Construction

236 concrete deliveries10 steel re-bar deliveries25 site operatives15 week site programme+3 weeks for external/party walls

Mass Timber Construction

30 Timber Deliveries1 Steel delivery7 Site operatives

10 week site programme (40% saving)

LIAM DEWAR

Bridport HouseCarbon Saving

Stored Carbon: 1,150 t CO2eq

Carbon Saving: 2,044 t CO2eq

Offset Period: 27 years

Effective Carbon Reduction Strategy

CLIENTHackney Borough Council

ARCHITECTKaracusevic Carson Architects

CONCRETE ENGINEERPeter Brett Associates

TIMBER ENGINEEREurban + Pirmin Jung

MAIN CONTRACTORWillmott Dixon Construction

TIMBER CONTRACTOREurban/ m2

ACCOMMODATION41 Residential Units

FLOOR AREA44,715 ft2

INSTALLATION PERIOD10 weeks

MATERIALS USEDCrosslam / Steel

MANUFACTURER Stora Enso Wood Products

COMPONENT THICKNESSES140, 160mm (Walls); 165-225mm (Floors, Roof)

LIAM DEWAR – TIMBER FOR THE MASSES

Bridport House, London, 2010Project Data

Cobalt Place, London, 2015AHMM | Eurban | 104 Residential Units, 170,000 ft2

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Cobalt PlaceDesign Proposal

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Cobalt PlaceQuality Assurance – Early Design Involvement

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Cobalt PlaceQuality Assurance – BIM

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Cobalt PlaceQuality Assurance – Design Co-ordination

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Cobalt PlaceQuality Assurance – Thorough Approvals Process

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Cobalt PlaceQuality Assurance – Efficient Panelisation

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Cobalt PlaceQuality Assurance – Planning & Sequencing

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Cobalt PlaceQuality Assurance – Detailed Site Drawings

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Cobalt PlaceQuality Assurance

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• Leica Total Station to map building during construction• Control over angle and verticality from setting out to completion

Cobalt PlaceInstallation

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Cobalt PlaceInstallation Directly off Trailer

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Cobalt Place

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Cobalt PlaceInstallation

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Cobalt PlaceDesign Co-ordination - Services

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Cobalt PlaceFire Point

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Cobalt PlaceStairs

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Cobalt PlaceTemporary Lighting (Winter)

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Cobalt PlaceWater

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Cobalt PlaceThird Moisture Reading – 14.7%

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Cobalt PlaceFit-Out

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Cobalt PlaceFit-Out

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Cobalt PlaceBrick Cladding

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Cobalt PlaceBrick Cladding

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Mass Appeal

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– Ideally suited for major regeneration work due to minimal dust and noise (considerate constructor)

– Ideally suited for public works due to timber content (wood first policy)

– Ideally suited for multi-storey projects due to structural properties

– Ideally suited for developer-led housing projects due to speed on site (early return on investment)

Social Housing, Cornebarrieu, 2011Perraudin Architecture | Promologis

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“All of a sudden, it didn’t bother me not being modern.”

QUOTE: ROLAND BARTHES

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Architecture Archive

Free the Tree

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This concludes The American Institute of Architects Continuing Education Systems Course

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