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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
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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
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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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