B-grade Job lotCondition grade 7/10 (B-grade). Assessed by the seller at listing; figures below relate to this specific lot of 30 packs · ≈90m².
Acoustic mineral wool slabs. Packaging slightly creased, product immaculate. Ideal for studwall sound insulation. Located in Liverpool — collection or arranged regional delivery available. Listed 24 days ago by Liverpool Urban Reclamation, a demolition based in Liverpool.
Every lot here was once destined for waste transfer — listing it instead keeps first-quality material in circulation at well below merchant list. B-grade pricing reflects cosmetics, not performance — the defect notes below set out exactly what was downgraded and why.
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.
No — what matters is the declared lambda value and installed thickness. Keep a facing photo showing the print line for your Building Regs file.
Flat, dry and off the ground. PIR facings degrade with prolonged UV exposure, so keep the wrap on until the day of fixing.
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 3 packs.
B-gradeMixed PIR pieces, all usable. Perfect for stud walls and ceiling bays. Thermally identical to full boards. Located in Liverpool — collection or arranged regional delivery available.
B-gradeSurplus to a Passivhaus retrofit. Better λ than PIR. Sealed packs, dry stored. Located in Liverpool — collection or arranged regional delivery available.
B-gradeSurplus from a hotel fit-out. Tapered edge for taping. 50% off merchant price. Located in Liverpool — collection or arranged regional delivery available.