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New surplus surplus insulation & plasterboard — Celotex GA4000 100mm offcuts (~18 m²) — ManchesterNew surplus

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

Manchester·~18 m²·Listed 26d ago
£90/lot
~21kg CO₂e saved

Sold by Manchester Greenfield Contractors (Contractor) · Ref L0395

Contact sellerHow buying works

Condition grade 9/10 (New surplus). 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 Manchester — collection or arranged regional delivery available. Direct from Manchester Greenfield Contractors, a contractor operating out of Manchester; live for 26 days.

This is exactly the kind of material that typically ends up in a skip costing the seller money; buying it diverts it back into a build. This is unused, current-spec material — the only thing second-hand about it is the price tag logic.

Measurements & specifications

Brand
Celotex GA4000
λ-value
0.022 W/mK
Location
Manchester
Ref
SB-40-01
Quantity / lot size
~18 m²
Thermal conductivity
λ 0.025 W/mK (per facing print)
Board squareness
Checked diagonal-to-diagonal on 3 sample boards
Edge profile
Tongue & groove
Storage
Flat-stacked, dry, off the ground since arrival
Facing condition
Foil/paper facings intact on 99% of boards

Condition report & known defects

9/10
  • Stored under cover since delivery; no weather exposure.
  • Unused stock — original banding/packaging intact where stated.
  • Original wrap opened on one pack for count verification, re-taped.

Carbon & sustainability notes

The 21 kg CO₂e figure on this listing is calculated against producing virgin PIR/mineral wool boards (PIR ~3.5 kg CO₂e per m² at 100mm).

Put another way — about 124 km of driving emissions, or 1 tree-years of carbon uptake.

If your project tracks embodied carbon (BREEAM, Part Z readiness, or client ESG reporting), keep this listing reference as evidence of avoided emissions.

Collection & delivery

  • Buyer collection in Manchester; pallet truck on site; tail-lift vehicles recommended.
  • Seller can quote hiab or flatbed delivery within ~30 miles of Manchester; from £85.
  • Ask the seller for close-up photos or a video walkround if you can't visit — they expect the request.

Typical applications

  • Warm roof build-ups and rafter-level insulation
  • Floor insulation under screed or chipboard
  • Dot-and-dab and stud-wall drylining
  • Garage conversions and garden offices

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 8 packs.

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