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New surplus surplus insulation & plasterboard — Celotex PIR offcuts 100mm — ~18m²New surplus

Celotex PIR offcuts 100mm — ~18m²

Bristol·~18 m² offcuts·Listed 1d ago
£95/lot
~60kg CO₂e saved

Sold by Bristol Eco Build (Contractor) · Ref L0031

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 offcuts.

About this lot

Mixed pieces of Celotex GA4000 100mm PIR. All usable, sizes range from 600×600 up to 2400×1200. Perfect for stud walls and ceiling bays. Thermally identical to full boards. Direct from Bristol Eco Build, a contractor operating out of Bristol; live for 1 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
Thickness
100mm
λ-value
0.022 W/mK
Quantity / lot size
~18 m² offcuts
Thermal conductivity
λ 0.029 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 100% of boards

Condition report & known defects

9/10
  • Corner crush on ~5% of boards from transit — cut-around loss only.
  • Minor pallet-edge scuffs to outer packaging only.
  • Stored under cover since delivery; no weather exposure.

Carbon & sustainability notes

The 60 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 354 km of driving emissions, or 3 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 Bristol; kerbside hand-load or forklift by arrangement.
  • Seller can quote hiab or flatbed delivery within ~30 miles of Bristol; from £85.
  • Ask the seller for close-up photos or a video walkround if you can't visit — they expect the request.

Typical applications

  • Dot-and-dab and stud-wall drylining
  • Garage conversions and garden offices
  • Acoustic upgrades between floors
  • Warm roof build-ups and rafter-level insulation

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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