UK · Updated 2026 · Explainer

Part Z & Embodied Carbon: Using Surplus Surplus EPS Insulation in Portsmouth

Whole-life carbon assessments are becoming mandatory on Portsmouth projects. Reclaimed and surplus EPS is the fastest lever for reducing A1–A3 embodied carbon in South East. This 2026 guide shows the numbers and the evidence you need.

Embodied carbon savings

Reclaimed EPS typically avoids 60–95% of the A1–A3 embodied carbon of a new equivalent. On a mid-size Portsmouth project this can equal 4–12 tonnes CO₂e avoided.

Part Z timeline and what it requires

  • Whole-life carbon assessment on all major projects
  • Reporting to a central UK register
  • Alignment with RICS WLCA methodology
  • Evidence of material provenance

Building a compliant evidence pack in Portsmouth

  • Yard invoice with weight/quantity
  • Photos and batch references
  • Manufacturer EPD comparison for baseline
  • Site delivery notes

Cost of EPS vs carbon benefit

GradeTypical priceNotes
Job-lot / bulk£4.00 per m²Merchant clearance, palletised
Standard graded£11.00 per m²Sorted, ready-to-fit stock
Heritage / premium£18.00 per m²Character grade, hand-picked

Frequently asked questions

+Is Part Z law yet?

Not yet fully — it's a private-members bill and industry alignment. Adoption on public and BREEAM projects is already widespread.

+How is carbon quantified for surplus?

A1–A3 emissions are usually set to zero for genuine reclaim; A4 (transport) uses actual distance.

+Is EPS fire-safe?

EPS is combustible — always use behind fire-rated linings.

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