Gardner Vaughan Group - Builder Developer

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◉ Guy Gardner Gunns marketing manager◉ Engineering consultancy then D&C company

started due to inability to penetrate traditional concrete/ steel market.

Gardner Vaughan Group - Builder Developer

3

◉ Guy Gardner Gunns marketing manager◉ Engineering consultancy then D&C company

started due to inability to penetrate traditional concrete/ steel market.

Gardner Vaughan Group - Builder Developer

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◉ Guy Gardner Gunns marketing manager◉ Engineering consultancy then D&C company

started due to inability to penetrate traditional concrete/ steel market.

◉ Mid rise residential 2000 - current.◉ Interest in CLT from WTEC 2016 in Vienna◉ Control projects from Acquisition, D&C, Sales,

management

◉ 11 Storey◉ 2 Basement Levels◉ Concrete Mezz and L1 podium◉ 39m overall height◉ 32 Apartments◉ 3583m2 GFA◉ 1017 m2 Site

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Monterey

◉ Desire for CLT project◉ Clem 7 tunnel below◉ Max 4-5 storey concrete structure

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WHY CLT FOR MONTEREY?

◉ Maximise yield from site◉ 2019 Changes 4+ storeys for all buildings◉ Health benefits - condensation NCC 2019 vs traditional ◉ Noise, dust, waste, storage and parking in KP◉ WHPS - Silica dust, #s, sharps, planned operations◉ Attractive to green values - carbon sink◉ Less waste◉ Structural trade damage

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BENEFITS OF CLT FOR MONTEREY?

345 Cars off the road for 1 year!

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BENEFITS OF CLT FOR MONTEREY?

Design

Archs, Structurals and services documented in Revit

● Wall thicknesses and build ups etc to ensure accuracy in CLT location.

● Tile and internal set outs to achieve best aesthetics

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Design

Archs, Structurals and services documented in Revit

● Wall thicknesses etc to ensure accuracy in CLT location.

● Tile and internal set outs to achieve best aesthetics

● Structural model assists coordination of wall. Floor, column and beam sizing in main model.

● Services modeled to assist in service coordination and penetration locations for shop fabrication. 10

Design

Design

CLT CHALLENGES

Customisation limitations

Limitations with load transfer

Changes during construction limited

Documentation accuracy and quality required

Early contractor involvement - D & C

Relevant unbiased advice difficult to get

Knowledge/ experience pool smaller than conventional

Ceiling heights vs service reticulation vs acoustics.

Wet area set downs

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Design

Design

STRUCTURE

Partnered early with Aurecon

Experience 25 King St

Pro timber

Challenges

Basement vs Tunnel

Transfers

Core - Permanent formwork system

Long narrow site

Client Value engineering demands (and limited CLT experience)

Shortening

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Design

Design

ACOUSTICS

Palmer Acoustics

Limited range of available data

In-situ testing during build to validate

ENERGY EFFICIENCY

Good thermal properties

Limited Bridging (0.13k vs 2.3k concrete)

Windows weak point

Dew point analysis challenging in sub tropics

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Design

Design

FIRE

Holmes fire

Over 25m - Not DTS

Multiple alternative solutions

Fully sprinklered

Most CLT fire protected (direct fire rated PB)

Balconies and hallways (maybe) exposed

Limited range of solutions and testing (increasing)

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Design

Detailing off plan

Early contractor involvement

Partitioning systems - fire/ acoustics

Service ducts and space to run

BIM models essential

Site decisions brought forward

Aesthetics

Accessibility

Layout

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Construction - Objectives

Avoid Wet screeds

5 day floor- floor cycle

Concrete core within cycle

Complete cladding install before scaffold strip

Limit risk of water ingress

No hobs

No external slab penetrations

Limit cladding penetrations exposed

Use CLT shops to allow early shop drawings for other trades (glazing, cabinetry etc) and aid set out of finishes (tiles etc)

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Construction - CLT Shop drawing and detailing

10 week Shop detailing program

Full model built over 2 weeks

Specific details modelled in 3d

Approval of 3D models

3D models used in manufacture and CNC work

Levels packaged for progressive review/ approval

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Construction - CLT Delivery and Installation

Anticipate 1 week per floor

Delivery via Semi trailer

Lifting order crucial (1st on top)

Lap direction determined by laying direction

Anticipate 25-35 lifts per day

Harnesses and barriers to leading edge

Need 15m x 15m lay down space

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Construction - CLT Delivery and Installation

Anticipate 1 week per floor

Delivery via Semi trailer

Lifting order crucial (1st on top)

Lap direction determined by laying direction

Anticipate 25-35 lifts per day

Harnesses and barriers to leading edge

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Construction - CLT Delivery and Installation

Anticipate 1 week per floor

Delivery via Semi trailer

Lifting order crucial (1st on top)

Lap direction determined by laying direction

Anticipate 25-35 lifts per day

Harnesses and barriers to leading edge

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Construction considerations - Weather

Water management well documented as a challenge

Conservative approach being taken first project with time

Difficulty with fire rated PB required prior to frame/ rough in

Aim to protect walls as going up, windows in early

Various ideas to protect floors and channel water out in floors above

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Construction considerations - Program

Off site detailing critical path

Commitment to delivery 10-12 weeks out

Delays and longer durations on site lead to back up in factory

Risk storage costs

5 Day turnaround floor to floor

Water controlled prior to any sheeting

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Construction considerations - Education + QA

Pre-planning

Clear details

Educating contractors - ECI

Traditional thinking

Focus on positive aspects

Closer eye on detail execution, fire, weather/ waterproofing, acoustics

ISO 9001 QMS

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◉ Consultant selection - CLT experience or interest - Open mind◉ Purchasers/ Clients - Fire, Water, unfamiliarity concerns

○ Sustainability and health benefits limited perceived value◉ Subcontractors - Overlook positives, build in safety margin

○ Penetrations○ Fixing○ Loading

◉ Public - deforestation using timber - Amazon etc◉ “Experts” advising against CLT

PERCEPTION CHALLENGES

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RESOURCES

Any questions ?

Thanks for listening!

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