Weight is the enemy of campervan conversions. Every kg you add reduces your payload for water, gear, and passengers. Standard 18mm birch ply is heavy — about 11kg per m². For a full van build with 20m² of board, that is 220kg before you add appliances, cushions, and personal gear.
This guide covers lightweight alternatives that can halve the weight of your furniture.
Weight Targets
A typical campervan conversion adds 400-700 kg of weight. Target ranges:
- Ultralight build: Under 200kg (featherweight furniture, minimal systems)
- Medium build: 300-500kg (standard plywood, basic systems)
- Heavy build: 600kg+ (full household-style furniture, large appliances)
Lightweight Material Options
1. Honeycomb Core Panels (Best Overall)
Honeycomb panels have a polypropylene (PP) or aluminium honeycomb core with thin facesheets of fibreglass, aluminium, or plywood.
- Weight: 3.5-5 kg/m² for 18mm panel (vs 11kg for plywood)
- Strength: Excellent — honeycomb structure is incredibly stiff
- Cost: £60-100 per m² (3-5x plywood)
- Suppliers: RDS Composites, CEL Components, Easy Composites UK
Best for: Large flat panels — bed bases, table tops, cabinet sides. Not suitable for complex shapes or heavily loaded shelves.
Real-world example: A full kitchen unit in 18mm honeycomb panel weighs 8kg vs 22kg in birch ply.
2. Foam Core / Foamular Panels (Mid-Weight)
A rigid foam core (XPS or polyurethane) faced with thin ply or fibreglass.
- Weight: 5-7 kg/m² for 25mm panel
- Strength: Good for flat panels, poor for point loads (screw pull-out is low)
- Cost: £40-60 per m²
Best for: Wall and ceiling panels, lightweight cabinet doors.
Limitation: Screws pull out easily. Use threaded inserts (M4 or M6) for any structural fixings.
3. Aluminium Composite Panel (Alupanel)
Two thin aluminium sheets bonded to a polyethylene core. Also called Alucobond or Dibond.
- Weight: 4-6 kg/m² for 3-4mm panel
- Strength: Very stiff for its thickness, good impact resistance
- Cost: £30-50 per m²
- Available from: Sign supply shops (used for signage)
Best for: Decorative wall panels, splashbacks, lightweight cabinet doors.
Limitation: Cannot take screws — must use rivets or adhesive. Not structural.
4. Project Panels (Very Lightweight)
Slotted polypropylene sheets that lock together like corrugated plastic. Used in exhibition displays.
- Weight: 1.5-2.5 kg/m²
- Strength: Low — only suitable for non-structural use
- Cost: £15-30 per m²
Best for: Storage bin dividers, drawer organisers, lightweight shelving.
5. Lite-Ply and Ultralight Plywood
Plywood made from thinner veneers (poplar, Paulownia, or okoume instead of birch).
- Weight: 6-8 kg/m² for 18mm (vs 11kg birch)
- Strength: 60-70% of birch plywood
- Cost: £40-70 per m²
- UK suppliers: Robbins Timber (Bristol), South London Timber (London)
Best for: A direct plywood replacement that still handles screws and glue well.
Weight Comparison Table
| Material | Weight (18mm) | Strength | Cost/m² | Screw Holding |
|---|---|---|---|---|
| Birch plywood | 11 kg | Excellent | £60 | Excellent |
| Honeycomb PP | 4 kg | Very good | £80 | Requires inserts |
| Foam core | 6 kg | Good | £50 | Poor |
| Alupanel (4mm) | 5 kg | Good (stiff) | £40 | Rivets only |
| Lite-ply (poplar) | 7 kg | Good | £50 | Good |
| Project panel | 2 kg | Low | £20 | None |
| OSB | 9 kg | Moderate | £25 | Moderate |
Which Panel Goes Where
Bed Base
Best: Honeycomb core panel (lightest and strong enough for point loads from mattress) Good: Lite-ply or 12mm birch ply
Kitchen Cabinets
Best: 12mm birch ply with honeycomb panel doors Good: Lite-ply with careful sealing
Wall Panels
Best: 4mm Alupanel (visually clean, lightweight, easy to clean) Good: 4mm birch ply (cheaper, can be painted)
Ceiling
Best: 3mm ply on 3mm foam core (light + insulating) Good: 4mm ply (simple and light enough)
Cupboard Doors
Best: Honeycomb panel or Alupanel (lightweight, rattle-free) Good: 6mm ply with edge banding
Weight Saving Strategy
A strategic approach saves the most weight per pound spent:
- Replace large panels first — ceiling, wall panels, bed base. These are the biggest area.
- Replace cupboard doors — 20 doors at 0.3m² each = 6m². Saving 4kg/m² = 24kg saved.
- Use 12mm instead of 18mm where possible — structure aside, many panels are over-engineered.
- Avoid double layers — some builds layer 6mm wall panel + 12mm cabinet back. One 12mm honeycomb board does both jobs at 70% less weight.
Example Weight Budget
| Component | Standard (Birch 18mm) | Lightweight Build | Saving |
|---|---|---|---|
| Bed base (2.5m²) | 27.5 kg | 10 kg (honeycomb) | 17.5 kg |
| Kitchen (4m²) | 44 kg | 20 kg (lite-ply) | 24 kg |
| Cupboard doors (3m²) | 33 kg | 9 kg (Alupanel) | 24 kg |
| Wall panels (8m²) | 36 kg (6mm ply) | 16 kg (Alupanel) | 20 kg |
| Ceiling (4m²) | 16 kg (4mm ply) | 8 kg (foam core) | 8 kg |
| Total | 156.5 kg | 63 kg | 93.5 kg saved |
Conclusion
Lightweight board materials can save 90-100kg from a typical van conversion — enough to carry an extra passenger, a full water tank, or a bike rack without exceeding your payload.
Our recommendation: Use honeycomb core panels for bed bases and large surfaces, lite-ply for cabinets, and Alupanel for wall and ceiling panels. Budget an extra £200-400 for materials, but the weight saving is worth it for full-time van life.
