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    Overbury’s carbon-storing wallboard for L&G: material and retrofit notes for engineers

    June 11, 2026|

    Reviewed by Tom Sullivan

    Overbury’s carbon-storing wallboard for L&G: material and retrofit notes for engineers

    First reported on The Construction Index

    30 Second Briefing

    Overbury has installed Adaptavate’s bio-based Breathaboard wallboard at Legal & General’s new London headquarters at 10 Coleman Street, providing a carbon‑storing, compostable alternative to conventional gypsum board. The pilot sits within a deep refurbishment that retains around 95% of the existing structure and integrates low‑carbon systems such as air source heat pumps, supporting L&G’s target of operational Net Zero across its offices by 2030. Adaptavate reports more than 100 projects registered and over £19m in demand via letters of intent and offtake agreements, signalling strong market interest in carbon‑negative fit‑out materials.

    Technical Brief

    • Breathaboard’s bio-based core stores biogenic carbon and is designed to be fully compostable post-strip‑out.
    • Overbury is running the product as a monitored trial at 10 Coleman Street to gather in‑use performance data.
    • Market pull is quantified by Adaptavate as demand exceeding £19m via letters of intent and offtake agreements.
    • More than 100 projects are formally registered with Adaptavate, creating a pipeline for scaling manufacturing and supply logistics.
    • L&G’s move to 10 Coleman Street is timed for early 2027, aligning pilot monitoring with pre‑occupation commissioning.

    Our Take

    Adaptavate also features in our coverage of Steico’s push on wood fibre insulation ahead of the UK Future Homes and Building Standards, signalling that its Breathaboard deployment at Legal & General’s London HQ aligns with a cluster of bio-based envelope and fit-out solutions targeting upcoming regulatory changes.

    Letters of intent and offtake agreements worth £19m and interest from more than 100 projects suggest Adaptavate is already moving beyond pilot scale, which should give Overbury and other UK fit-out contractors more confidence in long-term supply for low-carbon wallboard on London refurbishments.

    Retaining around 95% of the existing structure at 10 Coleman Street while targeting operational net zero by 2030 underlines how London office clients like Legal & General are now combining deep retrofit with low-embodied-carbon interiors, which in our database is becoming a hallmark of higher-value UK office repositioning projects rather than new-build schemes.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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