SSurplusBuilder.
B-grade surplus insulation & plasterboard — Surplus Kingspan K7 80mm phenolic (40 boards · 2.4×1.2m) — CardiffB-grade

Surplus Kingspan K7 80mm phenolic (40 boards · 2.4×1.2m) — Cardiff

Cardiff·40 boards · 2.4×1.2m·Listed 24d ago
£1,100/lot

Sold by Cardiff Urban Reclamation (Demolition) · Ref L0417

Contact sellerHow buying works

Condition grade 6/10 (B-grade). Assessed by the seller at listing; figures below relate to this specific lot of 40 boards · 2.4×1.2m.

About this lot

Surplus to a Passivhaus retrofit. Better λ than PIR. Sealed packs, dry stored. Located in Cardiff — collection or arranged regional delivery available. Direct from Cardiff Urban Reclamation, a demolition operating out of Cardiff; live for 24 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. It is graded down on appearance alone; structurally and functionally it performs as A-grade.

Measurements & specifications

Brand
Kingspan Kooltherm K7
λ-value
0.018 W/mK
Location
Cardiff
Ref
SB-41-11
Quantity / lot size
40 boards · 2.4×1.2m
Thermal conductivity
λ 0.035 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

6/10
  • Cosmetic seconds — graded down for appearance, not performance.
  • Allow a cutting/waste margin of ~10% over a normal A-grade order.

Carbon & sustainability notes

This listing carries no CO₂-saved figure because the material is new; the sustainability win here is waste prevention — first-quality stock staying out of the waste stream entirely.

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 Cardiff; telehandler on site, HGV access fine.
  • Seller can quote hiab or flatbed delivery within ~30 miles of Cardiff; from £85.
  • Ask the seller for close-up photos or a video walkround if you can't visit — they expect the request.

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 8 packs.

More surplus insulation & plasterboard

View all →