B-grade surplus insulation & plasterboard — Rockwool RWA45 50mm slabs (30 packs · ≈90m²) — LiverpoolB-grade Job lot

Rockwool RWA45 50mm slabs (30 packs · ≈90m²) — Liverpool

Liverpool·30 packs · ≈90m²·Listed 24d ago
£490/lot

Sold by Liverpool Urban Reclamation (Demolition) · Ref L0437

Condition grade 7/10 (B-grade). Assessed by the seller at listing; figures below relate to this specific lot of 30 packs · ≈90m².

About this lot

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.

Measurements & specifications

Density
45 kg/m³
Thickness
50mm
Location
Liverpool
Ref
SB-43-07
Quantity / lot size
30 packs · ≈90m²
Thermal conductivity
λ 0.024 W/mK (per facing print)
Board squareness
Checked diagonal-to-diagonal on 4 sample boards
Edge profile
Tapered edge
Storage
Flat-stacked, dry, off the ground since arrival
Facing condition
Foil/paper facings intact on 100% of boards

Condition report & known defects

7/10
  • Each unit inspected and photographed on request before dispatch.
  • Facing scuffs and 2 dented edges per pack; thermal performance unaffected.

Carbon & sustainability notes

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.

Collection & delivery

  • Collection from the seller's Liverpool premises — pallet truck on site; tail-lift vehicles recommended.
  • Nationwide pallet courier available — typically £55–£95 per pallet, 2–4 working days.
  • Viewings welcomed by appointment; the measurements table above reflects what was checked at listing.

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 3 packs.

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