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Technical Information

Dimensions of Green Unit ARC I and ARC II modular buildings

ARC I
  • Internal floor width 4.0m
  • Internal height 2.4m at highest point
  • Internal width 4.8m at widest point
  • External footprint width 4.4m
  • External width at widest point 5.4m
  • External overall height 3.2m
  • External height with floor at ground level 2.7m (foundation base 0.6m below ground level) 

ARC II

  • Internal floor width 6.4m
  • Internal height 2.4m at highest point
  • Internal width 7.2m at widest point
  • External footprint width 6.6m
  • External width at widest point 7.8m
  • External overall height 3.2m
  • External height with floor at ground level 2.7m (foundation base 0.6m below ground level) 

Materials used in design and build of ARC I and ARC II

  • Spruce and birch plywood structure
  • Wood fibre insulation
  • Breathable cloth (external membrane)
  • Airtight, vapour control (internal membrane)
  • Triple glazed units
  • High-performance airtight windows
  • High-performance airtight exterior doors
  • Internal cladding - painted timber (other options available, to be determined during design consultation) 
  • External cladding - thermally modified, sustainable UK poplar (other options available, to be determined during design consultation) 
  • Water-based acrylic paints and lacquers
  • Solvent-free adhesives
  • Water and root-proof roofing membrane

Technical specification of the Green Unit ARC 

 

Current UK regulations
(for non-dwellings)

Passivhaus requirements

Standard building

Green Unit

Floor insulation

0.25W/m²K

0.15W/m²K

0.22W/m²K

0.18W/m²K

Wall insulation

0.35W/m²K

0.15W/m²K

0.3W/m²K

0.16W/m²K

Ceiling insulation

0.25W/m²K

0.12W/m²K

0.24W/m²K

0.16W/m²K

Airtightness

10m³/hr/m²

0.6m³/hr/m²

10+ m³/hr/m²

2m³/hr/m²

Air changes per hour

10ach

0.6ach

7ach

variable to 10ach

Air quality

Medium

High, filtered

Medium

High, filtered

Air moisture content

30% – 60%

35% – 55%

Below 40%

45% – 50%

Comfort temperature

Not specified

17⁰ – 20⁰

22⁰

17 – 19⁰

Annual energy use per annum

Not specified

15kWh/m²

200 kWh/m²

15kWh/m²

Embodied energy

Not measured

Minimum possible

129 – 239 kW/m²

81 kW/m²

Recyclability

No requirement

Encouraged

Low recyclability

Fully recyclable

Testing procedure

SAP

Physical test

SAP

Physical test

 
Notes:
- See further information including information about U Values in Building Regulations Part L2A (non dwellings) on the Planning Portal (external link).
- See further information about Passivhaus requirements (external link).