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B-grade surplus insulation & plasterboard — Celotex GA4000 100mm offcuts (~18 m²) — CardiffB-grade

Celotex GA4000 100mm offcuts (~18 m²) — Cardiff

Cardiff·~18 m²·Listed 8d ago
£100/lot

Sold by Cardiff Urban Reclamation (Demolition) · Ref L0405

Contact sellerHow buying works

Condition grade 7/10 (B-grade). Assessed by the seller at listing; figures below relate to this specific lot of ~18 m².

About this lot

Mixed PIR pieces, all usable. Perfect for stud walls and ceiling bays. Thermally identical to full boards. Located in Cardiff — collection or arranged regional delivery available. Fresh to market — posted 8 days ago by Cardiff demolition Cardiff Urban Reclamation.

Surplus stock like this exists because projects over-order to avoid downtime — the saving gets passed to you instead of the skip. B-grade pricing reflects cosmetics, not performance — the defect notes below set out exactly what was downgraded and why.

Measurements & specifications

Brand
Celotex GA4000
λ-value
0.022 W/mK
Location
Cardiff
Ref
SB-40-11
Quantity / lot size
~18 m²
Thermal conductivity
λ 0.032 W/mK (per facing print)
Board squareness
Checked diagonal-to-diagonal on 4 sample boards
Edge profile
Tapered edge
Storage
Flat-stacked, dry, off the ground since arrival
Facing condition
Foil/paper facings intact on 98% of boards

Condition report & known defects

7/10
  • Facing scuffs and 4 dented edges per pack; thermal performance unaffected.
  • Each unit inspected and photographed on request before dispatch.

Carbon & sustainability notes

No reuse CO₂ credit is claimed on this lot: it is unused stock, so the embodied carbon was committed at manufacture. Buying it still prevents waste — material sent to landfill or energy recovery delivers none of its embodied value.

With Part Z and embodied-carbon reporting moving up the agenda, documented reuse like this is increasingly worth recording in your project's carbon log.

Collection & delivery

  • Collection from the seller's Cardiff premises — telehandler on site, HGV access fine.
  • Nationwide pallet courier available — typically £60–£115 per pallet, 2–4 working days.
  • Viewings welcomed by appointment; the measurements table above reflects what was checked at listing.

Typical applications

  • Garage conversions and garden offices
  • Acoustic upgrades between floors
  • Warm roof build-ups and rafter-level insulation
  • Floor insulation under screed or chipboard

Questions about this lot

Do part-sheets affect building control sign-off?+

No — what matters is the declared lambda value and installed thickness. Keep a facing photo showing the print line for your Building Regs file.

How should boards be stored on site?+

Flat, dry and off the ground. PIR facings degrade with prolonged UV exposure, so keep the wrap on until the day of fixing.

Is mixed-brand insulation OK in one roof?+

Yes, provided each zone's U-value calc uses the correct lambda for the board actually installed there. This lot is single-brand across all 5 packs.

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