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

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

Sheffield·~18 m²·Listed 6d ago
£100/lot
~21kg CO₂e saved

Sold by Sheffield Greenfield Contractors (Contractor) · Ref L0403

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 Sheffield — collection or arranged regional delivery available. Direct from Sheffield Greenfield Contractors, a contractor operating out of Sheffield; live for 6 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
Sheffield
Ref
SB-40-09
Quantity / lot size
~18 m²
Thermal conductivity
λ 0.025 W/mK (per facing print)
Board squareness
Checked diagonal-to-diagonal on 5 sample boards
Edge profile
Square edge
Storage
Flat-stacked, dry, off the ground since arrival
Facing condition
Foil/paper facings intact on 100% 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

Reusing this material saves roughly 21 kg CO₂e versus producing virgin PIR/mineral wool boards (PIR ~3.5 kg CO₂e per m² at 100mm).

That's equivalent to about 124 km of average petrol-car driving, or what 1 mature trees absorb in a year.

Reuse is the single fastest way to cut a build's embodied carbon — substitution beats offsetting every time.

Collection & delivery

  • Buyer collection in Sheffield; pallet truck on site; tail-lift vehicles recommended.
  • Regional pallet delivery can be arranged from £65 depending on postcode and lead time.
  • Inspection before purchase is encouraged — bring a tape and check sample units against the measurements above.

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 4 packs.

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