B Complete buildings/Structures/Units

Contents

B10 Prefabricated buildings/Structures
B11 Prefabricated building units

B10 Prefabricated buildings/Structures

WASTE:
• 30 m tonnes (33% of 90 m. tonnes/year) of waste is offcuts
• Site practices tend to put all waste into mixed skips and the likelihood of a scrap coming out of a mixed skip are poor
• Factory production segregated waste and clean methods of working mean scraps are more likely to be used to finish a job than not

CONSIDER:
• Offsite prefabrication: The construction industry skills shortage would benefit from more factory production
• On-site temporary factory production- benefits:
- less vehicles to deliver materials
- factory conditions usually result in better quality work and less waste
• Set up on-site factory production in weatherproof enclosure on solid base and thermally comfortable conditions
• Use of standard size components without cutting, to minimise offcuts and waste
• Balance with avoiding transporting large volumes of air
• Panelisation in preference to volumetric, unless fully equipped and heavy

AVOID:
• Factory controlled tolerances being spoiled by poor assembly tolerances on site.
• Cassette panels being delivered without any offcuts to permit propping and spacing off, causing operatives to cut out studs to do this.
• Composites which are difficult to recycle although there is some evidence that technology is catching up and permitting easy separation in the future.

RECYCLING:
• Reduced waste opportunities with factory condition production and segregated waste containers.
• Reused timber studwork.
• Recycled newspaper cellulose fibre thermal insulation, spray or loose fill in panels.

B11 Prefabricated building units

WASTE:
• 30 m tonnes (33% of 90 m. tonnes/year) of waste is offcuts
• Site practices tend to put all waste into mixed skips and the likelihood of a scrap coming out of a mixed skip are poor
• Factory production segregated waste and clean methods of working mean scraps are more likely to be used to finish a job than not

CONSIDER:
• Offsite prefabrication: The construction industry skills shortage would benefit from more factory production
• On-site temporary factory production- benefits:
- less vehicles to deliver materials
- factory conditions usually result in better quality work and less waste
• Set up on-site factory production in weatherproof enclosure on solid base and thermally comfortable conditions
• Use of standard size components without cutting, to minimise offcuts and waste
• Balance with avoiding transporting large volumes of air
• Panelisation in preference to volumetric, unless fully equipped and heavy
MATERIALS:
• Preassembled and pre-insulated panels
• Wall, floor or roof preassembled and pre-insulated panels
• Recycled newspaper cellulose fibre thermal insulation, spray into open panels, loose fill in panels, dry injected through holes cut and filled by machine
• Compound timber sections in preference to solid timber studs and joists
• Timber in preference to steel studs
• Reused timber studwork

AVOID:
• Factory controlled tolerances being spoiled by poor assembly tolerances on site.
• Cassette panels being delivered without any offcuts to permit propping and spacing off, causing operatives to cut out studs to do this.
• Composites which are difficult to recycle although there is some evidence that technology is catching up and permitting easy separation in the future.

RECYCLING:
• Reduced waste opportunities with factory condition production and segregated waste containers.
• Reused timber studwork.
• Recycled newspaper cellulose fibre thermal insulation, spray or loose fill in panels.