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BioDome

Shell: Straw-Clay & EPDM

Dome cross-section showing wall layers, insulation, and waterproofing membrane
Cross-section: straw-clay insulation, EPDM membrane, and earth-contact waterproofing layers

Key Topics

Section titled “Key Topics”
  • Light straw-clay mix: 12:1 straw-to-clay ratio, hand-packed into wattle basket
  • Wall thickness: 30–40cm, provides R-20 to R-25 insulation
  • EPDM membrane: 1.2mm thickness, applied over purlin deck with 30cm overlaps
  • Burlap mesh reinforcement: laid over EPDM, receives lime-earth render
  • Lime-earth render: 3:1 sand-to-lime, troweled in two coats
  • Earth-contact waterproofing: EPDM wraps down into gabion fill, sealed with bentonite clay