In the last year or so we have been researching methods of reducing construction costs and finding flexible solutions to providing new build homes in a city with tight planning constraints and increasingly expensive and diminishing pockets of land. One of the techniques we have been extensively working on is cross laminated timber (CLT) prefabrication.  

Flat Pack

Pros:

  • Simplicity of construction
  • Manageable unit sizes
  • No Limit to size of units created
  • Reduces time on site for erecting the principle waterproofed shell.

Cons:

  • More jointing interface details
  • Negotiation and coordination of parts on site
  • Individual panels limited by size of transport
Fig 1. Flat Pack Construction

Fig 1. Flat Pack Construction

Volumetric

Pros:

  • Fully finished plug and play units dropped into position
  • Very fast on site construction
  • Fully off site with workmanship and fabrication undertaken under controlled conditions.

Cons:

  • Size of units completely dependent on what can be transported (roughly 4.2m max width)
  • Limits flexibility in marginal increases in the overall unit size
  • Limits maximizing site potential due to strict grid requirements
Fig 2. Volumetric Construction

Fig 2. Volumetric Construction

Hybrid

Pros:

  • Highly serviced volumetric elements of small scale combined with highly serviced components or wall panels undertaken off site under controlled conditions.
  • Greater flexibility in overall design and adapting to site constraints
  • Limited complexity in the connection of services on site - plug and play concept for highly serviced often small areas requiring numerous trades

Cons:

  • Wide range of junction details and interface types to negotiate on site
  • Coordination
  • Future adaptability
Fig 3. Hybrid Construction

Fig 3. Hybrid Construction