Marine, BWP & Waterproof · Sizes & Thickness
Marine Plywood Sizes & Thickness Guide
Marine plywood comes in the same standard sheet sizes as other grades, with thickness options from 6mm up to 25mm — the right one depends entirely on what you're building.
Sheet Sizes We Stock
| Sheet Size | Metric Equivalent | Typical Use |
|---|---|---|
| 4 x 8 ft | 1220 x 2440mm | The most common size for furniture, cabinets and general carpentry |
| 5 x 10 ft | 1525 x 3050mm | Larger panels for bigger furniture runs and fewer joints |
Which Thickness Fits Your Project
6-9mm
Backing panels, drawer bottoms, and other light applications that don't carry structural load.
12mm
Shelving, partition panelling, and cabinet backs where moderate strength is enough.
16-19mm
The standard range for wardrobe and cabinet carcasses, kitchen counters, and most modular furniture bodies.
25mm
Heavy-duty applications — flooring support, staircases, and structural panels that carry significant weight.
Getting an Exact Quote
Sheet pricing varies by thickness, size and current market rates for face veneer and resin — see our plywood price factors guide for what drives the cost, or contact us directly for current rates on the size and thickness you need. See our marine plywood for wardrobes guide for a specific application walkthrough.
Thickness-wise Marine/BWP rate pages: 4mm, 6mm, 9mm, 12mm and 18mm.
Frequently Asked Questions
Is 12mm marine plywood strong enough for shelving?
Yes — 12mm is a common choice for shelving and cabinet backs where moderate strength is needed without the weight and cost of a thicker sheet.
What's the difference between 18mm and 19mm plywood?
The difference is marginal in practice — both fall in the standard range for wardrobe and cabinet carcasses, and either works for most modular furniture; availability sometimes decides which one you'll actually get.
When should I use 25mm marine plywood?
Reserve 25mm for heavy-duty structural applications like flooring support and staircases, where the sheet needs to carry significant weight — it's overkill for standard furniture.
What are the dimensions of a standard 4x8 plywood sheet?
A 4 x 8 ft sheet measures 1220 x 2440mm and is the most commonly used size for furniture, cabinets and general carpentry work.
Does marine plywood cost more than MR plywood at the same thickness?
Yes, generally — marine grade's phenolic bonding and typically denser face veneer command a price premium over MR at any given thickness; ask us for current rates on your required size.
Need the Right Board for Your Project?
WhatsApp us your requirement and we'll recommend the right grade and thickness.